Mineral Resource Classification - Review of Current Practices in NI 43-101 Technical Reports

CIM MEMO 2010
Paul Palmer, Kevin Palmer,
Abstract The introduction of the National Instrument (NI) 43-101 Standards of Disclosure for mineral projects has led to some very specific requirements for reporting mineral resource estimates for mineral projects to the public. The mineral resource estimate is based on the qualified person(s) completing the work to accepted industry practices and their experience. There is no one document that prescribes what is considered accepted industry practices. There are published guidelines provided by the CIM but, in general, the industry practices employed by qualified persons vary since different qualified persons will estimate and classify a mineral resource estimate for the same mineral project using different techniques. This happens on mineral projects as they advance from one study to the next as different qualified persons estimate and classify the mineral resource because of the different techniques employed. The techniques employed by the qualified persons vary from simple (polygonal) to very technical (block models, kriging and conditional simulation). The focus of this paper is to provide a review of some of the current practices that have been published in NI 43-101 technical reports with a focus on classifying mineral resources and the data support and techniques used in the classification.
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