Quality Control Monitoring At Oyu Tolgoi Cu-Au Project, South Gobi, Mongolia - Meeting and Exceeding Technical Disclosure Requirements

CIM Montreal 2003
Abstract The aim of Quality Control Monitoring on advanced exploration projects is to ensure that data from sampling, assaying, and recording of geological observations are of high integrity for the purpose of obtaining reliable mineral resource and reserve estimates. National Instrument 43-101 Standards of Disclosure for Mineral Projects states that all scientific and technical reports must be prepared and certified by a Qualified Person in accordance with professional and industry standards following Mineral Exploration Best Practices Guidelines and Definitions, and Guidelines of the CIM Standards on Mineral Resources and Reserves. Additional information is given in Companion Policy 43-101CP and Technical Report Form 43-101F1.

Although the Qualified Person must discuss and describe the Sampling Method and Approach; Sample Preparation, Analyses, and Security; and Data Verification; there is little specific information in the guidelines on how to actually setup and conduct Quality Control monitoring programs. Examples from the Oyu Tolgoi Cu-Au Project are given for: optimizing sampling protocols; following proper sample preparation procedures; safeguarding sample shipments through chain of custody; ensuring quality of assaying with round robin monitoring programs; verifying transcribed data; and validating data with check assays to ensure high integrity for resource and reserve estimation.

Oyu Tolgoi is in the South Gobi desert of Mongolia, 550 km south of Ulaanbaatar, Mongolia, and 875 km northwest of Beijing, China. The project covers a major, copper-gold porphyry system comprising the South West, Central, and Far North deposits with multiple oxide, supergene, and hypogene ore types. Exploration is by multiple diamond drill rigs with samples prepared on-site and shipped to facilities in Mongolia, Canada, and Australia.
Keywords: Quality Control Monitoring, Assaying, Recording Geological Observations, High integrity data, Qualified Person, Technical Disclosure, NI 43-101, Oyu Tolgoi, Sampling, Resource/reserve estimation
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