February 21, 2018
  CIM Magazine - Standards Column
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Estimation of Mineral Resources / Reserves
Estimation of Mineral Resources & Mineral Reserves Best Practice Guidelines
These guidelines are intended to assist the Qualified Person(s) (QP) in the planning, supervision, preparation, and reporting
of Mineral Resource and Mineral Reserve (MRMR) estimates.

The "General Guidelines" section of this document deals primarily with the description of best practice as it applies to metalliferous deposits. The Committee recognizes that certain commodities require specialized treatments.

Some such commodities have been considered by appropriate sub-committees of experts and their reports are appended.

These include:

  • potash
  • industrial minerals
  • coal
  • uranium

Adopted by CIM Council on November 23, 2003

PDF - Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines (11/23/2003)

Coal Specific Guidelines
 Best practice guidelines specific to coal estimation. 

PDF - Guidelines for Best Practices in Coal

Lateritic Deposits
Lateritic deposits are a gorup of residual deposits that typically develop as soils in areas with warm, wet climates. These are mainly surficial deposits, though some have been buried and are mined via underground methods.

PDF - Lateritic Deposits Estimation Guidelines

Placer Deposits Estimation Guidelines
Placer deposits include several different types of commodities and a range of geological environments.

The three deposit types discussed here are considered to have specific technical issues that require specialized knowledge.

They are:

1- Mineral sands
2- Placer gold
3- Alluvial diamonds

PDF - Placer Deposits Estimation Guidelines

Potash Specific Guidelines
Estimation guidelines for potash deposits. 

PDF - Potash Estimation Guidelines

Rock Hosted Diamonds
Due to diamonds' distinguishing aspects, diamond-specific guidelines are appropriate to complement the CIM Best Practices Guidelines. Diamonds are different from other minerals:

  • they occur as discrete particles in concentrations as low as parts per billion
  • the release of diamonds from the host rock is a function of excavation and processing
  • the value of diamonds varies from deposit to deposit and varies with stone size within a given deposit.

These aspects must be considered when sampling, evaluating the resource and establishing the reserve of a deposit.

PDF - Best Practice Guidelines for Rock Host Diamonds Estimation

Uranium Specific Guidelines
The General Guidelines for other metals, outlined in the Best Practice Guidelines, are also applicable to uranium deposits.

However, because of the radioactive nature of uranium, and in some cases the amenability of this metal to In Situ Leach (ISL) mining methods, additional guidelines are appropriate.

PDF - Best Practices in Uranium Estimation Guidelines