An old drilling archive can save an exploration team substantial work, provided the information is suitable for its intended use. Scanning paper logs and importing spreadsheets improves accessibility. The owner's harder decision is which records can support quantitative interpretation and which should remain contextual until their limitations are resolved.
Separate transcription from technical review
A migration programme should preserve the original document and show where each digital field came from. Ambiguous handwriting, missing units and inconsistent identifiers deserve explicit exception records. The person entering information should not silently decide what a geologist probably meant. A hypothetical interval written with an unclear depth boundary needs review before becoming a precise database entry. CIM's guidance distinguishes primary observations from interpretations and encourages organised, retrievable records. That makes provenance part of the database design, rather than a note added after the import is complete.
Reconstruct the spatial framework
A drilling record becomes more useful when its location and orientation can be placed reliably within the current survey system. Older coordinate descriptions, local grids and incomplete down-hole surveys require technical attention. The team should document transformations and their uncertainty. A professional review may determine that some records support broad geological context while others support a more detailed model. Moving all the records into one digital coordinate system does not make their original location quality equal. The resulting classifications should travel with the information through exports and subsequent modelling.
Decide what requires confirmation
The review should compare the information needed for the intended estimate with the archive actually available. Sample methods, laboratory procedures and recovery records may be incomplete. Confirmation work should target the gaps with the greatest consequences. That could mean locating original certificates, inspecting preserved material or commissioning additional investigation where justified. JORC's transparency principle supports explaining material limitations. It does not require a reader to regard every historical result as worthless; it requires enough context to understand the evidence and the claims built upon it.
Preserve the economics of uncertainty
An investor should see both the value of reusable information and the cost of validating it. A cheaper programme that relies on unsupported historical assumptions may simply postpone expenditure until a later and more expensive decision. The owner can maintain a data acceptance register showing permitted uses, limitations and outstanding work. As evidence improves, the register changes with it. The commercial objective is an efficient investigation founded on records the technical team can defend. A digitised archive becomes an asset when its users understand what each record can legitimately contribute to the next decision.
