Bench Mapping

Bench mapping documents the geology exposed on mining faces. Purpose - Validate geological model - Identify structural controls - Guide grade control - Update resource model Mapping Procedure 1. Mark face at regular intervals e.g., 5m 2. Record lithology, alteration, mineralization 3. Measure structure orientations 4. Take photographs 5. Draw interpretive cross-section Features to Map - Lithology contacts - Fault locations and orientations - Vein locations and widths - Alteration boundaries - Oxidation boundary Safety Considerations - Work from safe distance from face - Beware of loose rocks - Communicate with operations - Wear appropriate PPE

All lessons in Open Pit Geology — Return to the complete Open Pit Geology course outline.
Previous lesson: Blast Hole Sampling — Blast hole sampling provides the primary data for grade control decisions. Sample Collection Cone Sampling Collect representative sample from drill…
Next lesson: Ore/Waste Delineation — Delineating ore from waste is the core function of grade control. Polygon Generation Inverse Distance Weight nearby samples by inverse of distance.

Verification resources

Cross-check terminology, classification, methods, and safety with these authoritative external resources.

Mineral Exploration Best Practice Guidelines — Canadian Institute of Mining, Metallurgy and Petroleum. Professional guidance for geological data, sampling, interpretation, security, and QA/QC.
The life cycle of a mineral deposit — U.S. Geological Survey. Scientific context for mineral deposits, extraction, processing, and reclamation.
Regulation 854: Mines and Mining Plants — Government of Ontario. Current Ontario requirements for surface-mine face examination, loose-rock control, bench and wall hazards, safe access, blasting, and competent supervision.

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Bench Mapping

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Verification resources