Canada: The Checkerboard Effect in Mineral Resource Reporting for Underground Mines

June 23, 2021 all-day

For its Wednesday, June 23, 2021 meeting, CIM’s Management and Economics Society is pleased to welcome:

Reno Pressacco, M.Sc. (A), P.Geo.

Associate Principal Geologist, SLR Consulting Ltd.


who will deliver an online presentation on:

The Checkerboard Effect in Mineral Resource Reporting for Underground Mines


Abstract: One of the fundamental components of the CIM Definition Standards for a Mineral Resource is the requirement for “Reasonable Prospects for Eventual Economic Extraction.” Many Mineral Resource estimates are currently prepared with computer-aided methods and the Mineral Resource statements are often prepared by reporting the tonnes and grade of those blocks that are above a nominated cut-off grade or value. The use of computer-aided methods can result in block models containing an irregular patchwork of blocks above and below the nominated cut-off grade or value such that a reporting bias can occur when applying a strict block cut-off grade criteria alone for underground settings. This bias is referred to as “The Checkerboard Effect.”


BIO: Reno Pressacco is a retired mineral resource geologist and continues to participate with SLR Consulting (Canada) as an Associate Principal Geologist. Reno holds a Masters Degree from McGill university and has over 35 years of experience that has been spent in such roles as exploration geologist, mine development, mine production, and as a consultant to the mining industry. During his career he has played a key role in identifying the economic potential of the Matachewan gold deposit (Ontario) at the exploration stage. This deposit achieved commercial production in 2013 and is currently forecasted to produce between 190,000 to 205,000 ounces of gold for 2021. He was also fortunate to participate in the early stages of the Cerro Negro mine (Argentina) where he participated in the discovery phase and prepared some of the initial Mineral Resource estimates for the Eureka Vein. More recently he has participated in the crafting of the CIM Mineral Exploration Best Practices Guidelines (2018) and the CIM Mineral Resource and Mineral Reserve Best Practices Guidelines (2019). He received the CIM Robert Elver award in 2020.


Please join us!

Wednesday, June 23, 2021, at 3:30pm EDT


How to Attend:

The seminar is complimentary. Please register for it by Tuesday, June 22, to secure your place. RSVP by replying to if you are interested in attending it. Alternatively, you can register via EventBrite (click HERE).



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