Technical
Derisk staff have compiled a series of short technical notes covering a diverse range of topics relevant to the mineral industry. Please take a moment to browse through these notes and contact us if you would like more information.
Mineral Resources and Ore Reserves – How the lack of direct data impacts uncertainty and risk
The reporting of an Ore Reserve is an explicit admission that a company has completed a comprehensive technical and commercial study concluding that extraction is viable. However, many new and existing mines underperform – in extreme cases closing prematurely. Ore...
QA/QC is not just about sampling and assaying
Quality management is a system that integrates both quality assurance (QA) and quality control (QC) to deliver products and services that consistently meet requirements.
Valuation risks of relying on Inferred Resources
Successful exploration programs reach a stage where there are substantial Inferred Mineral Resources.
Planning and organising effective site visits
Site visits to exploration prospects, mine development properties and operating mine sites can be a critical component of many project reviews, audits, technical studies, expert reports and operational support projects undertaken for a client.
How important is a pre-feasibility study?
The typical study sequence for mineral projects envisages three or four significant study levels as a project progresses from exploration to production:
Valuing operations with minimal Ore Reserves
Many mining projects, particularly narrow vein underground precious metals projects, have limited Ore Reserves defined at any time.
The future of site-based mining geologists
When will site-based mining geologists become redundant? And will the Coronavirus pandemic provide further incentive to fast-track a process that has already commenced?
Due diligence: How long is a piece of string?
Companies considering an option to purchase a mineral asset generally embark on some form of technical due diligence
The value and importance of geological database integrity
Exploration and mining companies have only one primary asset – what’s in the ground they own or have rights over. Consequently, the geological database is the cornerstone of a company’s most important asset.
Who reads your Ore Reserve statement and why?
Ore Reserve is a critically important term used throughout the minerals industry.
Mining: High risk or high reward?
Mining is often regarded as a “high risk” industry, also capable of delivering “high rewards” when times are good.
Public v private mining companies: Some pro’s and con’s from a technical perspective
Mining is a global business and operated by both publicly-listed and privately-owned companies. From a technical perspective, what are the key advantages and disadvantages of each option?
References
Ore Reserve risks – Do decision makers really understand the principal source of uncertainty? (refereed extended abstract).
Berry, M. and Dorricott, M., 2025. Presented at 9th International Conference on Geology and Mine Planning, Santiago (Gecamin).
Why QA/QC is not just about sampling and analysis (non-refereed presentation).
Berry, M., 2024. Presented at QA/QC for Exploration and Mining (The AIG).
Financial analysis: Closing the loop in valuing mining geology (refereed technical paper).
Collier, P., Sommerville, B. and Berry, M., 2019. In proceedings of Mining Geology Conference 2019, pp 237–252 (The AusIMM).
Geological uncertainty – A key challenge for effective life-of-mine planning (refereed technical paper).
Berry, M., 2018. In proceedings of From Start to Finish: A Life-of-Mine Perspective Conference, pp 27–32 (The AusIMM).
Australian drilling trends: Boom to bust and beyond (lightly refereed extended abstract).
Berry, M., 2017. In proceedings of Drilling for Geology II Conference 2017, pp 3–8 (The AIG).
Benchmarking – Does it have a role in improving the performance of mining geology? (refereed technical paper)
Berry, M., 2014. In proceedings of Mining Geology Conference 2014, pp 361–366 (The AusIMM).
The importance of understanding uncertainty and risk associated with all geological inputs to Ore Reserves (refereed technical paper)
Berry, M., 2014. In Monograph 30: Mineral Resource and Ore Reserve Estimation – The AusIMM Guide to Good Practice Second Edition, pp 585-592 (The AusIMM).