Three-Dimensional Geologic Block Modeling Of The Kutcho Creek Massive Sulfide Deposit, British Columbia
David E. Hamilton, Robert S. Didur, 1992. "Three-Dimensional Geologic Block Modeling Of The Kutcho Creek Massive Sulfide Deposit, British Columbia", Computer Modeling of Geologic Surfaces and Volumes, David E. Hamilton, Thomas A. Jones
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Three-dimensional geologic block models were used to evaluate the Kutcho Creek volcanogenic massive sulfide deposit in north-central British Columbia. This stratiform deposit dips 45° and contains significant amounts of copper, zinc, silver, and gold mineralization. Over 16,000 m of drill core information and 1000 m of assays for each of the four metals and for specific gravity were used. Geologic contacts from directionally drilled holes were available for each of nine interpreted horizons.
Separate three-dimensional models were built for each metal and for specific gravity. Each model contained approximately 3.1 million cells, with cell dimensions of 10 m by 10 m (horizontal) by 2 m (vertical). Grids were used to define rock-unit boundaries and the correlations within those rock units. These grids controlled three-dimensional interpolation of assay values from the drill holes to the model cells.
Individual metal models were combined into a single copper-equivalent model using current milling and market costs for each metal. Sections through the model were used to quality check the model and to design several open-pit mine configurations. Geologic and mine-recoverable reserves, including average grade, tonnage, and waste/ore ratios, were determined for the entire deposit and on a bench-by-bench basis for the final pit. The calculations were used to fine-tune the final pit design and for mine planning.
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A collection of papers on computer-mapping case studies, this publication is a useful “go-by” for both beginners and advanced users of computer-mapping software. Fore the most part, the papers concentrate on the geologic features of significance to mapping, the methods used and their justification, and results obtained. The publication is separated into two parts. Part 1 consists of 12 papers dealing with data and surface modeling. Part 2 consists of 7 papers dealing with three-dimensional geologic block modeling.