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Abstract

The Importance of a geologic map in the development of an ore deposit is fairly obvious. Perhaps less obvious is the fact that different kinds of maps may be required at different stages of the project. Table VIII-A presents the sequence of stages in the development of a mineral deposit used by SOQUEM to enable the public to visualize the scope of activities involved at various stages in the life of a project (Vallée, 1986). Table I-A presented a somewhat similar effort by Hanna Mining to relate the degree of risk to the stage of development of a mineral project.

Immediately following the discovery of potentially oregrade mineralization, the question of concern is, “Is there likely to be enough of this mineralization present to warrant further expenditure?”

For this purpose, a fairly generalized map may be sufficient to guide ongoing exploration. By the time a development decision is reached, a map (or maps) defining the relationship between different types of ore in the deposit, their detailed structural settings, the relationship of the deposit to host rocks of varying competence, the distribution of recoverable grades within the various ore types, and any special features of geotechnical interest will be required to guide actual mine layouts. Such maps can be prepared only with input from geological, metallurgical, engineering, and operations personnel—in other words, from all the disciplines associated with a mining operation.

Failure to involve nongeological expertise at an early stage in project development is one of the reasons for the

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