{"id":92668,"date":"2026-07-03T02:45:58","date_gmt":"2026-07-03T02:45:58","guid":{"rendered":"https:\/\/gaeatech.com\/knowledge-center\/?p=92668"},"modified":"2026-06-26T02:47:11","modified_gmt":"2026-06-26T02:47:11","slug":"recovery-rqd-scr-tcr-validation","status":"publish","type":"post","link":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/","title":{"rendered":"Recovery, RQD, SCR, and TCR Validation"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Best Practices for Validating Rock Core Quality Measurements in Geological and Geotechnical Investigations<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Rock core logging is one of the most important activities performed during geotechnical investigations and mineral exploration drilling. The measurements collected from drill core\u2014including <strong>Core Recovery<\/strong>, <strong>Rock Quality Designation (RQD)<\/strong>, <strong>Solid Core Recovery (SCR)<\/strong>, and <strong>Total Core Recovery (TCR)<\/strong>\u2014provide essential information about rock mass quality, fracture intensity, drilling conditions, excavation performance, slope stability, tunnel design, and resource evaluation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These parameters are used daily by engineering geologists, geotechnical engineers, mining engineers, hydrogeologists, and resource geologists. They influence major design decisions involving tunnels, dams, foundations, open pits, underground mines, and infrastructure projects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because these measurements are so influential, even small errors can have significant consequences. An incorrectly calculated RQD may overestimate rock quality. An invalid SCR value may affect tunnel support design. Recovery measurements greater than 100 percent or inconsistent relationships between SCR, TCR, and RQD can indicate data entry errors, incorrect measurements, or misunderstandings of logging procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern geological databases can eliminate many of these problems by combining standardized logging procedures with automated validation rules, cross-dataset consistency checks, structured workflows, and independent technical review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This article examines best practices for validating Recovery, RQD, SCR, and TCR measurements and explains how automated QA\/QC improves the reliability and defensibility of rock core data.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Rock Core Validation Matters<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Rock quality measurements influence numerous engineering and exploration activities.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rock mass classification<\/li>\n\n\n\n<li>Tunnel support design<\/li>\n\n\n\n<li>Foundation engineering<\/li>\n\n\n\n<li>Slope stability analysis<\/li>\n\n\n\n<li>Underground mine design<\/li>\n\n\n\n<li>Open pit design<\/li>\n\n\n\n<li>Resource estimation<\/li>\n\n\n\n<li>Hydrogeological investigations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Errors introduced during core logging often propagate throughout downstream analyses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation helps detect these errors before they affect engineering decisions.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Understanding the Four Core Measurements<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Although related, Recovery, TCR, SCR, and RQD each describe different characteristics of the recovered core.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Total Core Recovery (TCR)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">TCR measures the total length of all recovered core pieces expressed as a percentage of the drilled run length.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intact core<\/li>\n\n\n\n<li>Broken fragments<\/li>\n\n\n\n<li>Small pieces<\/li>\n\n\n\n<li>Weathered material<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because all recovered material is included, TCR is typically the highest recovery-related value.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run length:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1.50 m<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recovered core:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1.44 m<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TCR:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">96%<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Solid Core Recovery (SCR)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">SCR measures only competent, solid pieces of core that satisfy the project&#8217;s minimum criteria.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Loose fragments and highly broken material are excluded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SCR provides a better indication of competent rock than TCR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consequently:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SCR is generally less than or equal to TCR.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Rock Quality Designation (RQD)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">RQD measures the percentage of intact core pieces greater than 100 mm in length.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Developed by Deere in the 1960s, RQD remains one of the most widely used indicators of rock mass quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Higher RQD values generally indicate fewer fractures and better rock quality.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Core Recovery<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many organizations also calculate overall core recovery independently of TCR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on local procedures, Recovery may represent:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Total recovered length<\/li>\n\n\n\n<li>Recovered drilling interval<\/li>\n\n\n\n<li>Project-specific recovery calculations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should clearly define how Recovery is calculated within their QA procedures.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Expected Relationships<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Because these measurements describe related characteristics of the same core, logical relationships should always exist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most common relationship is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RQD \u2264 SCR \u2264 TCR \u2264 Recovery \u2264 100%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When these relationships are violated, validation warnings or errors should be generated.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Standardized Logging Procedures<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Validation begins with consistent logging procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should document:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Measurement methods<\/li>\n\n\n\n<li>Minimum fragment sizes<\/li>\n\n\n\n<li>RQD procedures<\/li>\n\n\n\n<li>SCR criteria<\/li>\n\n\n\n<li>Core reconstruction methods<\/li>\n\n\n\n<li>Broken core handling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Without standardized procedures, validation becomes far less effective.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Digital Core Measurement<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many organizations now perform logging using digital geological databases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Digital systems provide advantages including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automatic calculations<\/li>\n\n\n\n<li>Real-time validation<\/li>\n\n\n\n<li>Reduced transcription errors<\/li>\n\n\n\n<li>Consistent units<\/li>\n\n\n\n<li>Immediate feedback<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Digital logging greatly improves QA\/QC compared with manual spreadsheets.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Automated Validation Rules<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Modern geological software can automatically evaluate recovery measurements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Rule 1 \u2014 Recovery Cannot Exceed 100%<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery values above 100% indicate measurement or calculation errors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Rule 2 \u2014 TCR Cannot Exceed Recovery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Since TCR measures recovered core, it cannot exceed total recovery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>TCR \u2264 Recovery<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Rule 3 \u2014 SCR Cannot Exceed TCR<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Solid core cannot exceed total recovered core.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SCR \u2264 TCR<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Rule 4 \u2014 RQD Cannot Exceed SCR<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RQD measures only long competent pieces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RQD \u2264 SCR<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Rule 5 \u2014 RQD Cannot Exceed Recovery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RQD \u2264 Recovery<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Rule 6 \u2014 Negative Values<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery measurements cannot be negative.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Rule 7 \u2014 Missing Values<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Where core has been logged, required measurements should be present.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Missing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recovery<\/li>\n\n\n\n<li>SCR<\/li>\n\n\n\n<li>TCR<\/li>\n\n\n\n<li>RQD<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">should generate completeness warnings.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Cross-Dataset Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Validation should extend beyond individual values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Relationships between datasets provide powerful QA\/QC opportunities.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Lithology vs RQD<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RQD generally applies only to competent rock.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If RQD appears within unconsolidated soil intervals, the data should be reviewed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Core Boxes vs Logged Recovery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recovered core visible in photographs should reasonably match logged recovery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Large discrepancies may indicate logging errors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Recovery vs Drilling Method<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Certain drilling techniques may influence recovery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation rules can identify unexpected results requiring review.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Structural Logging<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Highly fractured intervals typically correspond with lower RQD values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although not always true, significant inconsistencies should be reviewed by experienced geologists.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Completeness Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before approval, geological databases should verify that all required measurements have been recorded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Recovery<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 RQD<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 SCR<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 TCR<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Run length<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Lithology<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Depth interval<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Logger<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Logging date<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Missing information should prevent final approval until resolved or formally justified.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Range Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Validation should confirm realistic values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical limits include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Parameter<\/th><th>Valid Range<\/th><\/tr><\/thead><tbody><tr><td>Recovery<\/td><td>0\u2013100%<\/td><\/tr><tr><td>TCR<\/td><td>0\u2013100%<\/td><\/tr><tr><td>SCR<\/td><td>0\u2013100%<\/td><\/tr><tr><td>RQD<\/td><td>0\u2013100%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Values outside these ranges should generate immediate errors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Duplicate Interval Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Each recovery interval should be unique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation should detect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Duplicate intervals<\/li>\n\n\n\n<li>Overlapping intervals<\/li>\n\n\n\n<li>Gaps<\/li>\n\n\n\n<li>Incorrect depth ordering<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Interval validation prevents numerous downstream problems.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Metadata Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery measurements should include supporting metadata.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Logger<\/li>\n\n\n\n<li>Logging date<\/li>\n\n\n\n<li>Drill hole ID<\/li>\n\n\n\n<li>Run number<\/li>\n\n\n\n<li>Core size<\/li>\n\n\n\n<li>Orientation method<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Metadata improves traceability and supports future audits.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Technical Review<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Automation cannot replace geological judgment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Senior reviewers should evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Core reconstruction<\/li>\n\n\n\n<li>Fracture interpretation<\/li>\n\n\n\n<li>Weathering effects<\/li>\n\n\n\n<li>Unusual recovery<\/li>\n\n\n\n<li>Broken core handling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Independent review remains an essential component of QA\/QC.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Workflow Integration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery validation should form part of the overall geological workflow.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended process:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Core logging completed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Automated validation executed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Validation exceptions reviewed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Technical review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Approval.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Data locked.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Structured workflows improve accountability while reducing accidental errors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Audit Trails<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Every modification should be recorded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Audit records should capture:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>User<\/li>\n\n\n\n<li>Date<\/li>\n\n\n\n<li>Previous value<\/li>\n\n\n\n<li>New value<\/li>\n\n\n\n<li>Reason for change<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Audit trails strengthen both quality assurance and legal defensibility.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Common Logging Errors<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Frequently encountered problems include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recovery greater than 100%<\/li>\n\n\n\n<li>RQD greater than Recovery<\/li>\n\n\n\n<li>SCR greater than TCR<\/li>\n\n\n\n<li>Missing recovery values<\/li>\n\n\n\n<li>Duplicate intervals<\/li>\n\n\n\n<li>Incorrect run lengths<\/li>\n\n\n\n<li>Incorrect units<\/li>\n\n\n\n<li>RQD recorded within soil<\/li>\n\n\n\n<li>Missing metadata<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Most of these errors can be identified automatically.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Data Governance<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Successful QA\/QC depends upon clear governance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Logging standards<\/li>\n\n\n\n<li>Validation rules<\/li>\n\n\n\n<li>Reviewer responsibilities<\/li>\n\n\n\n<li>Approval authority<\/li>\n\n\n\n<li>Revision procedures<\/li>\n\n\n\n<li>Data retention policies<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Governance ensures consistency across drilling campaigns.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Benefits of Automated Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Modern geological databases provide substantial advantages over manual review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Benefits include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Immediate error detection<\/li>\n\n\n\n<li>Consistent calculations<\/li>\n\n\n\n<li>Reduced manual checking<\/li>\n\n\n\n<li>Faster approvals<\/li>\n\n\n\n<li>Higher confidence<\/li>\n\n\n\n<li>Improved audit readiness<\/li>\n\n\n\n<li>Better resource models<\/li>\n\n\n\n<li>Reduced engineering risk<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Automation allows geologists to focus on interpretation rather than data verification.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Emerging Technologies<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery validation continues to evolve.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern systems increasingly incorporate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Digital core scanners<\/li>\n\n\n\n<li>AI-assisted fracture recognition<\/li>\n\n\n\n<li>Automated RQD calculation<\/li>\n\n\n\n<li>Machine vision core measurements<\/li>\n\n\n\n<li>Cloud-based geological databases<\/li>\n\n\n\n<li>Real-time validation dashboards<\/li>\n\n\n\n<li>Digital approval workflows<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These technologies will further improve consistency while reducing human error.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Best Practices Checklist<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Standardize recovery measurement procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Define Recovery, TCR, SCR, and RQD consistently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Capture data digitally whenever possible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Validate relationships automatically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Compare related datasets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Require independent technical review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Preserve audit trails.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Maintain complete metadata.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Lock approved records.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Review validation reports before resource modelling or engineering design.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Example Validation Matrix<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Validation Rule<\/th><th>Severity<\/th><th>Action<\/th><\/tr><\/thead><tbody><tr><td>Recovery &gt; 100%<\/td><td>Error<\/td><td>Reject record<\/td><\/tr><tr><td>TCR &gt; Recovery<\/td><td>Error<\/td><td>Correct value<\/td><\/tr><tr><td>SCR &gt; TCR<\/td><td>Error<\/td><td>Correct value<\/td><\/tr><tr><td>RQD &gt; SCR<\/td><td>Error<\/td><td>Correct value<\/td><\/tr><tr><td>Missing RQD<\/td><td>Warning<\/td><td>Review interval<\/td><\/tr><tr><td>Missing Recovery<\/td><td>Warning<\/td><td>Complete data<\/td><\/tr><tr><td>Duplicate Interval<\/td><td>Error<\/td><td>Resolve conflict<\/td><\/tr><tr><td>Gap Between Runs<\/td><td>Warning<\/td><td>Verify drilling records<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Conclusion<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery, TCR, SCR, and RQD are among the most important measurements collected during rock core logging, forming the basis for geotechnical assessment, resource estimation, and engineering design. Because these values are closely related, they provide an ideal opportunity for automated QA\/QC through logical validation rules and cross-dataset consistency checks. By implementing standardized logging procedures, digital data capture, automated validation engines, structured review workflows, comprehensive audit trails, and strong data governance, organizations can significantly improve the accuracy, consistency, and defensibility of their geological databases. As exploration and geotechnical projects continue to generate larger and more complex datasets, rigorous validation of rock quality measurements will remain essential for delivering reliable geological information and supporting confident engineering and mining decisions.<\/p>\n\n\n\n<h1 id=\"h-best-practices-for-validating-rock-core-quality-measurements-in-geological-and-geotechnical-investigations\" class=\"wp-block-heading\">Best Practices for Validating Rock Core Quality Measurements in Geological and Geotechnical Investigations<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Rock core logging is one of the most important activities performed during geotechnical investigations and mineral exploration drilling. The measurements collected from drill core\u2014including <strong>Core Recovery<\/strong>, <strong>Rock Quality Designation (RQD)<\/strong>, <strong>Solid Core Recovery (SCR)<\/strong>, and <strong>Total Core Recovery (TCR)<\/strong>\u2014provide essential information about rock mass quality, fracture intensity, drilling conditions, excavation performance, slope stability, tunnel design, and resource evaluation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These parameters are used daily by engineering geologists, geotechnical engineers, mining engineers, hydrogeologists, and resource geologists. They influence major design decisions involving tunnels, dams, foundations, open pits, underground mines, and infrastructure projects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because these measurements are so influential, even small errors can have significant consequences. An incorrectly calculated RQD may overestimate rock quality. An invalid SCR value may affect tunnel support design. Recovery measurements greater than 100 percent or inconsistent relationships between SCR, TCR, and RQD can indicate data entry errors, incorrect measurements, or misunderstandings of logging procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern geological databases can eliminate many of these problems by combining standardized logging procedures with automated validation rules, cross-dataset consistency checks, structured workflows, and independent technical review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This article examines best practices for validating Recovery, RQD, SCR, and TCR measurements and explains how automated QA\/QC improves the reliability and defensibility of rock core data.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-why-rock-core-validation-matters\" class=\"wp-block-heading\">Why Rock Core Validation Matters<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Rock quality measurements influence numerous engineering and exploration activities.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rock mass classification<\/li>\n\n\n\n<li>Tunnel support design<\/li>\n\n\n\n<li>Foundation engineering<\/li>\n\n\n\n<li>Slope stability analysis<\/li>\n\n\n\n<li>Underground mine design<\/li>\n\n\n\n<li>Open pit design<\/li>\n\n\n\n<li>Resource estimation<\/li>\n\n\n\n<li>Hydrogeological investigations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Errors introduced during core logging often propagate throughout downstream analyses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation helps detect these errors before they affect engineering decisions.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-understanding-the-four-core-measurements\" class=\"wp-block-heading\">Understanding the Four Core Measurements<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Although related, Recovery, TCR, SCR, and RQD each describe different characteristics of the recovered core.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-total-core-recovery-tcr\" class=\"wp-block-heading\">Total Core Recovery (TCR)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">TCR measures the total length of all recovered core pieces expressed as a percentage of the drilled run length.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intact core<\/li>\n\n\n\n<li>Broken fragments<\/li>\n\n\n\n<li>Small pieces<\/li>\n\n\n\n<li>Weathered material<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because all recovered material is included, TCR is typically the highest recovery-related value.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run length:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1.50 m<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recovered core:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1.44 m<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TCR:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">96%<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-solid-core-recovery-scr\" class=\"wp-block-heading\">Solid Core Recovery (SCR)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">SCR measures only competent, solid pieces of core that satisfy the project&#8217;s minimum criteria.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Loose fragments and highly broken material are excluded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SCR provides a better indication of competent rock than TCR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consequently:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SCR is generally less than or equal to TCR.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-rock-quality-designation-rqd\" class=\"wp-block-heading\">Rock Quality Designation (RQD)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">RQD measures the percentage of intact core pieces greater than 100 mm in length.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Developed by Deere in the 1960s, RQD remains one of the most widely used indicators of rock mass quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Higher RQD values generally indicate fewer fractures and better rock quality.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-core-recovery\" class=\"wp-block-heading\">Core Recovery<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many organizations also calculate overall core recovery independently of TCR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on local procedures, Recovery may represent:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Total recovered length<\/li>\n\n\n\n<li>Recovered drilling interval<\/li>\n\n\n\n<li>Project-specific recovery calculations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should clearly define how Recovery is calculated within their QA procedures.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-expected-relationships\" class=\"wp-block-heading\">Expected Relationships<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Because these measurements describe related characteristics of the same core, logical relationships should always exist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most common relationship is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RQD \u2264 SCR \u2264 TCR \u2264 Recovery \u2264 100%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When these relationships are violated, validation warnings or errors should be generated.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-standardized-logging-procedures\" class=\"wp-block-heading\">Standardized Logging Procedures<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Validation begins with consistent logging procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should document:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Measurement methods<\/li>\n\n\n\n<li>Minimum fragment sizes<\/li>\n\n\n\n<li>RQD procedures<\/li>\n\n\n\n<li>SCR criteria<\/li>\n\n\n\n<li>Core reconstruction methods<\/li>\n\n\n\n<li>Broken core handling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Without standardized procedures, validation becomes far less effective.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-digital-core-measurement\" class=\"wp-block-heading\">Digital Core Measurement<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many organizations now perform logging using digital geological databases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Digital systems provide advantages including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automatic calculations<\/li>\n\n\n\n<li>Real-time validation<\/li>\n\n\n\n<li>Reduced transcription errors<\/li>\n\n\n\n<li>Consistent units<\/li>\n\n\n\n<li>Immediate feedback<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Digital logging greatly improves QA\/QC compared with manual spreadsheets.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-automated-validation-rules\" class=\"wp-block-heading\">Automated Validation Rules<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Modern geological software can automatically evaluate recovery measurements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-rule-1-recovery-cannot-exceed-100\" class=\"wp-block-heading\">Rule 1 \u2014 Recovery Cannot Exceed 100%<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery values above 100% indicate measurement or calculation errors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-rule-2-tcr-cannot-exceed-recovery\" class=\"wp-block-heading\">Rule 2 \u2014 TCR Cannot Exceed Recovery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Since TCR measures recovered core, it cannot exceed total recovery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>TCR \u2264 Recovery<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-rule-3-scr-cannot-exceed-tcr\" class=\"wp-block-heading\">Rule 3 \u2014 SCR Cannot Exceed TCR<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Solid core cannot exceed total recovered core.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SCR \u2264 TCR<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-rule-4-rqd-cannot-exceed-scr\" class=\"wp-block-heading\">Rule 4 \u2014 RQD Cannot Exceed SCR<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RQD measures only long competent pieces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RQD \u2264 SCR<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-rule-5-rqd-cannot-exceed-recovery\" class=\"wp-block-heading\">Rule 5 \u2014 RQD Cannot Exceed Recovery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Validation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RQD \u2264 Recovery<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-rule-6-negative-values\" class=\"wp-block-heading\">Rule 6 \u2014 Negative Values<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery measurements cannot be negative.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Severity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Error<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-rule-7-missing-values\" class=\"wp-block-heading\">Rule 7 \u2014 Missing Values<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Where core has been logged, required measurements should be present.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Missing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recovery<\/li>\n\n\n\n<li>SCR<\/li>\n\n\n\n<li>TCR<\/li>\n\n\n\n<li>RQD<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">should generate completeness warnings.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-cross-dataset-validation\" class=\"wp-block-heading\">Cross-Dataset Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Validation should extend beyond individual values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Relationships between datasets provide powerful QA\/QC opportunities.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-lithology-vs-rqd\" class=\"wp-block-heading\">Lithology vs RQD<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RQD generally applies only to competent rock.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If RQD appears within unconsolidated soil intervals, the data should be reviewed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-core-boxes-vs-logged-recovery\" class=\"wp-block-heading\">Core Boxes vs Logged Recovery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recovered core visible in photographs should reasonably match logged recovery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Large discrepancies may indicate logging errors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-recovery-vs-drilling-method\" class=\"wp-block-heading\">Recovery vs Drilling Method<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Certain drilling techniques may influence recovery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation rules can identify unexpected results requiring review.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"h-structural-logging\" class=\"wp-block-heading\">Structural Logging<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Highly fractured intervals typically correspond with lower RQD values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although not always true, significant inconsistencies should be reviewed by experienced geologists.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-completeness-validation\" class=\"wp-block-heading\">Completeness Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before approval, geological databases should verify that all required measurements have been recorded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Recovery<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 RQD<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 SCR<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 TCR<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Run length<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Lithology<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Depth interval<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Logger<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Logging date<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Missing information should prevent final approval until resolved or formally justified.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-range-validation\" class=\"wp-block-heading\">Range Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Validation should confirm realistic values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical limits include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Parameter<\/th><th>Valid Range<\/th><\/tr><\/thead><tbody><tr><td>Recovery<\/td><td>0\u2013100%<\/td><\/tr><tr><td>TCR<\/td><td>0\u2013100%<\/td><\/tr><tr><td>SCR<\/td><td>0\u2013100%<\/td><\/tr><tr><td>RQD<\/td><td>0\u2013100%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Values outside these ranges should generate immediate errors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-duplicate-interval-validation\" class=\"wp-block-heading\">Duplicate Interval Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Each recovery interval should be unique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation should detect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Duplicate intervals<\/li>\n\n\n\n<li>Overlapping intervals<\/li>\n\n\n\n<li>Gaps<\/li>\n\n\n\n<li>Incorrect depth ordering<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Interval validation prevents numerous downstream problems.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-metadata-validation\" class=\"wp-block-heading\">Metadata Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery measurements should include supporting metadata.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Logger<\/li>\n\n\n\n<li>Logging date<\/li>\n\n\n\n<li>Drill hole ID<\/li>\n\n\n\n<li>Run number<\/li>\n\n\n\n<li>Core size<\/li>\n\n\n\n<li>Orientation method<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Metadata improves traceability and supports future audits.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-technical-review\" class=\"wp-block-heading\">Technical Review<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Automation cannot replace geological judgment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Senior reviewers should evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Core reconstruction<\/li>\n\n\n\n<li>Fracture interpretation<\/li>\n\n\n\n<li>Weathering effects<\/li>\n\n\n\n<li>Unusual recovery<\/li>\n\n\n\n<li>Broken core handling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Independent review remains an essential component of QA\/QC.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-workflow-integration\" class=\"wp-block-heading\">Workflow Integration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery validation should form part of the overall geological workflow.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended process:<\/p>\n\n\n\n<h3 id=\"h-step-1\" class=\"wp-block-heading\">Step 1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Core logging completed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 id=\"h-step-2\" class=\"wp-block-heading\">Step 2<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Automated validation executed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 id=\"h-step-3\" class=\"wp-block-heading\">Step 3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Validation exceptions reviewed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 id=\"h-step-4\" class=\"wp-block-heading\">Step 4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Technical review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 id=\"h-step-5\" class=\"wp-block-heading\">Step 5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Approval.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<h3 id=\"h-step-6\" class=\"wp-block-heading\">Step 6<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Data locked.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Structured workflows improve accountability while reducing accidental errors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-audit-trails\" class=\"wp-block-heading\">Audit Trails<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Every modification should be recorded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Audit records should capture:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>User<\/li>\n\n\n\n<li>Date<\/li>\n\n\n\n<li>Previous value<\/li>\n\n\n\n<li>New value<\/li>\n\n\n\n<li>Reason for change<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Audit trails strengthen both quality assurance and legal defensibility.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-common-logging-errors\" class=\"wp-block-heading\">Common Logging Errors<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Frequently encountered problems include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recovery greater than 100%<\/li>\n\n\n\n<li>RQD greater than Recovery<\/li>\n\n\n\n<li>SCR greater than TCR<\/li>\n\n\n\n<li>Missing recovery values<\/li>\n\n\n\n<li>Duplicate intervals<\/li>\n\n\n\n<li>Incorrect run lengths<\/li>\n\n\n\n<li>Incorrect units<\/li>\n\n\n\n<li>RQD recorded within soil<\/li>\n\n\n\n<li>Missing metadata<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Most of these errors can be identified automatically.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-data-governance\" class=\"wp-block-heading\">Data Governance<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Successful QA\/QC depends upon clear governance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Logging standards<\/li>\n\n\n\n<li>Validation rules<\/li>\n\n\n\n<li>Reviewer responsibilities<\/li>\n\n\n\n<li>Approval authority<\/li>\n\n\n\n<li>Revision procedures<\/li>\n\n\n\n<li>Data retention policies<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Governance ensures consistency across drilling campaigns.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-benefits-of-automated-validation\" class=\"wp-block-heading\">Benefits of Automated Validation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Modern geological databases provide substantial advantages over manual review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Benefits include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Immediate error detection<\/li>\n\n\n\n<li>Consistent calculations<\/li>\n\n\n\n<li>Reduced manual checking<\/li>\n\n\n\n<li>Faster approvals<\/li>\n\n\n\n<li>Higher confidence<\/li>\n\n\n\n<li>Improved audit readiness<\/li>\n\n\n\n<li>Better resource models<\/li>\n\n\n\n<li>Reduced engineering risk<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Automation allows geologists to focus on interpretation rather than data verification.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-emerging-technologies\" class=\"wp-block-heading\">Emerging Technologies<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery validation continues to evolve.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern systems increasingly incorporate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Digital core scanners<\/li>\n\n\n\n<li>AI-assisted fracture recognition<\/li>\n\n\n\n<li>Automated RQD calculation<\/li>\n\n\n\n<li>Machine vision core measurements<\/li>\n\n\n\n<li>Cloud-based geological databases<\/li>\n\n\n\n<li>Real-time validation dashboards<\/li>\n\n\n\n<li>Digital approval workflows<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These technologies will further improve consistency while reducing human error.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-best-practices-checklist\" class=\"wp-block-heading\">Best Practices Checklist<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations should:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Standardize recovery measurement procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Define Recovery, TCR, SCR, and RQD consistently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Capture data digitally whenever possible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Validate relationships automatically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Compare related datasets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Require independent technical review.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Preserve audit trails.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Maintain complete metadata.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Lock approved records.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Review validation reports before resource modelling or engineering design.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-example-validation-matrix\" class=\"wp-block-heading\">Example Validation Matrix<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Validation Rule<\/th><th>Severity<\/th><th>Action<\/th><\/tr><\/thead><tbody><tr><td>Recovery &gt; 100%<\/td><td>Error<\/td><td>Reject record<\/td><\/tr><tr><td>TCR &gt; Recovery<\/td><td>Error<\/td><td>Correct value<\/td><\/tr><tr><td>SCR &gt; TCR<\/td><td>Error<\/td><td>Correct value<\/td><\/tr><tr><td>RQD &gt; SCR<\/td><td>Error<\/td><td>Correct value<\/td><\/tr><tr><td>Missing RQD<\/td><td>Warning<\/td><td>Review interval<\/td><\/tr><tr><td>Missing Recovery<\/td><td>Warning<\/td><td>Complete data<\/td><\/tr><tr><td>Duplicate Interval<\/td><td>Error<\/td><td>Resolve conflict<\/td><\/tr><tr><td>Gap Between Runs<\/td><td>Warning<\/td><td>Verify drilling records<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"h-conclusion\" class=\"wp-block-heading\">Conclusion<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Recovery, TCR, SCR, and RQD are among the most important measurements collected during rock core logging, forming the basis for geotechnical assessment, resource estimation, and engineering design. Because these values are closely related, they provide an ideal opportunity for automated QA\/QC through logical validation rules and cross-dataset consistency checks. By implementing standardized logging procedures, digital data capture, automated validation engines, structured review workflows, comprehensive audit trails, and strong data governance, organizations can significantly improve the accuracy, consistency, and defensibility of their geological databases. As exploration and geotechnical projects continue to generate larger and more complex datasets, rigorous validation of rock quality measurements will remain essential for delivering reliable geological information and supporting confident engineering and mining decisions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Best Practices for Validating Rock Core Quality Measurements in Geological and Geotechnical Investigations Rock core logging is one of the most important activities performed during geotechnical investigations and mineral exploration drilling. The measurements collected from drill core\u2014including Core Recovery, Rock Quality Designation (RQD), Solid Core Recovery (SCR), and Total Core Recovery (TCR)\u2014provide essential information about [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":92669,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[792,1880],"tags":[1980,1985,1992,809,1885,1990,263,1978,481,1983,1987,1991,1981,1989,1988],"class_list":["post-92668","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-borehole-data-management","category-borehole-qa-qc","tag-core-recovery","tag-digital-core-logging","tag-exploration-qa-qc","tag-geological-database","tag-geological-qa-qc","tag-geological-validation","tag-geotechnical-drilling","tag-mineral-exploration","tag-mining-software","tag-resource-estimation","tag-rock-core-logging","tag-rock-quality","tag-rqd","tag-scr","tag-tcr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Recovery, RQD, SCR, and TCR Validation - Knowledge Center<\/title>\n<meta name=\"description\" content=\"Explore best practices for Recovery, RQD, SCR, and TCR Validation to ensure quality in rock core logging for geotechnical projects.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Recovery, RQD, SCR, and TCR Validation\" \/>\n<meta property=\"og:description\" content=\"Explore best practices for Recovery, RQD, SCR, and TCR Validation to ensure quality in rock core logging for geotechnical projects.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/\" \/>\n<meta property=\"og:site_name\" content=\"Knowledge Center\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.linkedin.com\/company\/2663277\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-03T02:45:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/06\/recovery-rqd-scr-tcr-validation-hero.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1536\" \/>\n\t<meta property=\"og:image:height\" content=\"1024\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"GAEA Technologies\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"GAEA Technologies\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/\"},\"author\":{\"name\":\"GAEA Technologies\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#\\\/schema\\\/person\\\/940fb5fed6e95dd9d0ec1370207f5dba\"},\"headline\":\"Recovery, RQD, SCR, and TCR Validation\",\"datePublished\":\"2026-07-03T02:45:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/\"},\"wordCount\":2840,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/recovery-rqd-scr-tcr-validation-hero.jpg\",\"keywords\":[\"core recovery\",\"digital core logging\",\"exploration QA QC\",\"Geological Database\",\"geological qa qc\",\"geological validation\",\"geotechnical drilling\",\"mineral exploration\",\"Mining Software\",\"resource estimation\",\"rock core logging\",\"rock quality\",\"RQD\",\"SCR\",\"TCR\"],\"articleSection\":[\"Borehole Data Management\",\"QA\\\/QC\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/\",\"url\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/\",\"name\":\"Recovery, RQD, SCR, and TCR Validation - Knowledge Center\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/recovery-rqd-scr-tcr-validation-hero.jpg\",\"datePublished\":\"2026-07-03T02:45:58+00:00\",\"description\":\"Explore best practices for Recovery, RQD, SCR, and TCR Validation to ensure quality in rock core logging for geotechnical projects.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#primaryimage\",\"url\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/recovery-rqd-scr-tcr-validation-hero.jpg\",\"contentUrl\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/recovery-rqd-scr-tcr-validation-hero.jpg\",\"width\":1536,\"height\":1024,\"caption\":\"A comprehensive QA\\\/QC workflow for validating Recovery, Total Core Recovery (TCR), Solid Core Recovery (SCR), and Rock Quality Designation (RQD) to improve geological data quality and engineering confidence.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/recovery-rqd-scr-tcr-validation\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Recovery, RQD, SCR, and TCR Validation\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#website\",\"url\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/\",\"name\":\"GAEA Technologies Blog\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#organization\",\"name\":\"GAEA Technologies\",\"url\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/Gaea_3dlogo_white-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/Gaea_3dlogo_white-scaled.jpg\",\"width\":2560,\"height\":1440,\"caption\":\"GAEA Technologies\"},\"image\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.linkedin.com\\\/company\\\/2663277\\\/\"],\"description\":\"GAEA Technologies develops and distributes geoscience and engineering solutions worldwide. Our solutions have been used for over 30 years by companies and organizations around the world.\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#\\\/schema\\\/person\\\/940fb5fed6e95dd9d0ec1370207f5dba\",\"name\":\"GAEA Technologies\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/cdc2b26dbe02c637b6e6ae5e99ff7928c8d2c7fb325dffb8da7e8b0af95dcbd7?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/cdc2b26dbe02c637b6e6ae5e99ff7928c8d2c7fb325dffb8da7e8b0af95dcbd7?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/cdc2b26dbe02c637b6e6ae5e99ff7928c8d2c7fb325dffb8da7e8b0af95dcbd7?s=96&d=mm&r=g\",\"caption\":\"GAEA Technologies\"},\"sameAs\":[\"https:\\\/\\\/gaeatech.com\\\/wordpress\"],\"url\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/author\\\/mfraser\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Recovery, RQD, SCR, and TCR Validation - Knowledge Center","description":"Explore best practices for Recovery, RQD, SCR, and TCR Validation to ensure quality in rock core logging for geotechnical projects.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/","og_locale":"en_US","og_type":"article","og_title":"Recovery, RQD, SCR, and TCR Validation","og_description":"Explore best practices for Recovery, RQD, SCR, and TCR Validation to ensure quality in rock core logging for geotechnical projects.","og_url":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/","og_site_name":"Knowledge Center","article_publisher":"https:\/\/www.linkedin.com\/company\/2663277\/","article_published_time":"2026-07-03T02:45:58+00:00","og_image":[{"width":1536,"height":1024,"url":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/06\/recovery-rqd-scr-tcr-validation-hero.jpg","type":"image\/jpeg"}],"author":"GAEA Technologies","twitter_card":"summary_large_image","twitter_misc":{"Written by":"GAEA Technologies","Est. reading time":"13 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#article","isPartOf":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/"},"author":{"name":"GAEA Technologies","@id":"https:\/\/gaeatech.com\/knowledge-center\/#\/schema\/person\/940fb5fed6e95dd9d0ec1370207f5dba"},"headline":"Recovery, RQD, SCR, and TCR Validation","datePublished":"2026-07-03T02:45:58+00:00","mainEntityOfPage":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/"},"wordCount":2840,"commentCount":0,"publisher":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/#organization"},"image":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#primaryimage"},"thumbnailUrl":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/06\/recovery-rqd-scr-tcr-validation-hero.jpg","keywords":["core recovery","digital core logging","exploration QA QC","Geological Database","geological qa qc","geological validation","geotechnical drilling","mineral exploration","Mining Software","resource estimation","rock core logging","rock quality","RQD","SCR","TCR"],"articleSection":["Borehole Data Management","QA\/QC"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/","url":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/","name":"Recovery, RQD, SCR, and TCR Validation - Knowledge Center","isPartOf":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/#website"},"primaryImageOfPage":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#primaryimage"},"image":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#primaryimage"},"thumbnailUrl":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/06\/recovery-rqd-scr-tcr-validation-hero.jpg","datePublished":"2026-07-03T02:45:58+00:00","description":"Explore best practices for Recovery, RQD, SCR, and TCR Validation to ensure quality in rock core logging for geotechnical projects.","breadcrumb":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#primaryimage","url":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/06\/recovery-rqd-scr-tcr-validation-hero.jpg","contentUrl":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/06\/recovery-rqd-scr-tcr-validation-hero.jpg","width":1536,"height":1024,"caption":"A comprehensive QA\/QC workflow for validating Recovery, Total Core Recovery (TCR), Solid Core Recovery (SCR), and Rock Quality Designation (RQD) to improve geological data quality and engineering confidence."},{"@type":"BreadcrumbList","@id":"https:\/\/gaeatech.com\/knowledge-center\/recovery-rqd-scr-tcr-validation\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/gaeatech.com\/knowledge-center\/"},{"@type":"ListItem","position":2,"name":"Recovery, RQD, SCR, and TCR Validation"}]},{"@type":"WebSite","@id":"https:\/\/gaeatech.com\/knowledge-center\/#website","url":"https:\/\/gaeatech.com\/knowledge-center\/","name":"GAEA Technologies Blog","description":"","publisher":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/gaeatech.com\/knowledge-center\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/gaeatech.com\/knowledge-center\/#organization","name":"GAEA Technologies","url":"https:\/\/gaeatech.com\/knowledge-center\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/gaeatech.com\/knowledge-center\/#\/schema\/logo\/image\/","url":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2025\/12\/Gaea_3dlogo_white-scaled.jpg","contentUrl":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2025\/12\/Gaea_3dlogo_white-scaled.jpg","width":2560,"height":1440,"caption":"GAEA Technologies"},"image":{"@id":"https:\/\/gaeatech.com\/knowledge-center\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.linkedin.com\/company\/2663277\/"],"description":"GAEA Technologies develops and distributes geoscience and engineering solutions worldwide. Our solutions have been used for over 30 years by companies and organizations around the world."},{"@type":"Person","@id":"https:\/\/gaeatech.com\/knowledge-center\/#\/schema\/person\/940fb5fed6e95dd9d0ec1370207f5dba","name":"GAEA Technologies","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/cdc2b26dbe02c637b6e6ae5e99ff7928c8d2c7fb325dffb8da7e8b0af95dcbd7?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/cdc2b26dbe02c637b6e6ae5e99ff7928c8d2c7fb325dffb8da7e8b0af95dcbd7?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/cdc2b26dbe02c637b6e6ae5e99ff7928c8d2c7fb325dffb8da7e8b0af95dcbd7?s=96&d=mm&r=g","caption":"GAEA Technologies"},"sameAs":["https:\/\/gaeatech.com\/wordpress"],"url":"https:\/\/gaeatech.com\/knowledge-center\/author\/mfraser\/"}]}},"jetpack_featured_media_url":"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/06\/recovery-rqd-scr-tcr-validation-hero.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/posts\/92668","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/comments?post=92668"}],"version-history":[{"count":1,"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/posts\/92668\/revisions"}],"predecessor-version":[{"id":92670,"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/posts\/92668\/revisions\/92670"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/media\/92669"}],"wp:attachment":[{"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/media?parent=92668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/categories?post=92668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaeatech.com\/knowledge-center\/wp-json\/wp\/v2\/tags?post=92668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}