Downhole Surveys

Downhole surveys determine actual hole trajectory. Why Survey - Holes deviate from planned path - True position needed for modeling - Regulatory requirements Survey Methods Single Shot - One reading per survey run - Gyroscopic or magnetic - Suitable for short holes Multi-Shot - Multiple readings per run - More data points - Common for exploration Continuous - Readings during drilling - Steering guidance - Highest resolution Survey Frequency - First survey at 50-100m - Then every 30-50m - Additional at target depths

All lessons in Drill Program Management — Return to the complete Drill Program Management course outline.
Previous lesson: Core Handling Procedures — Proper core handling preserves sample integrity. At the Rig - Mark orientation line immediately - Block core to preserve structure - Measure recovery …
Next lesson: Data Management — Effective data management is critical for program success. Database Requirements Core Tables - Collar location, orientation, depth - Survey downhole…

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 exploration planning, supervision, documentation, sampling, and QA/QC.
Geoscience maps — Natural Resources Canada. Government geoscience maps and datasets used to support regional exploration context.

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Downhole Surveys

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Verification resources