Exploration and Production Geological Operations

Audit of:

During a standard audit at a drill site, several key activities are conducted to ensure the accuracy and adherence to protocols in the drilling process. This includes the confirmation of hole depth by physically measuring the stick-up after rods are pushed back into the borehole. Percussion sampling methods are rigorously validated against established protocols to guarantee precision in data and sample collection. Core recoveries are calculated by comparing the length of the retrieved core with the recorded core run length, providing insights into the effectiveness of the drilling operation.

The audit also involves scrutinising recently completed percussion and diamond borehole samples, verifying their masses, and ensuring that the sampling procedures align with established protocols. Additionally, the capture of collar coordinates and borehole deflection logs is confirmed, contributing to the overall assessment of the drilling site’s compliance and accuracy in data recording.

During the audit process, several key steps are taken to validate the integrity and accuracy of core-related data. The geologist is requested to extract core from a recently drilled and logged borehole, and the core recoveries are cross-checked against records in the borehole database specific to that borehole. Verification is conducted to ensure that the borehole in question was logged by a qualified geologist. The metadata of logged and sampled boreholes, along with assay information from the laboratory, is checked for its inclusion in records. The audit requests a list of such boreholes from the year preceding the audit date and randomly selects one or two for detailed verification, including drilling dates and the name of the logging geologist. Validation is sought regarding the capture and storage of core photos from the logged borehole.

Additionally, the geologist is asked to extract core from a recently drilled, logged, and sampled borehole to validate the correspondence of begin and end depths of samples with the geology database, against the indications in the core box. Core cutting is scrutinised for adherence to established protocols. The masses of primary core samples are verified against records, and confirmation is sought on whether core sample masses are accurately recorded on dispatch documentation.

These meticulous steps contribute to ensuring the accuracy and reliability of core-related data within the audit scope.