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Design of drill-hole grid spacings for evaluating low-grade copper deposits

Author: Richard F Hewlett; United States. Bureau of Mines.; Bear Creek Mining Company.; University of Arizona. State Bureau of Mines.; University of Arizona. College of Mines.
Publisher: [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1965.
Series: Report of investigations (United States. Bureau of Mines), 6634.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
This report describes how a limited number of preliminary exploration drill-hole assays from a mineral deposit can be used to design grid spacing that is both economic and efficient for subsequent evaluation drilling of that deposit. Relationships between desired precision of the estimate of grade of ore and drilling cost are used to determine the economic drill-hole spacing. The statistical concept of precision in  Read more...
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Additional Physical Format: Online version:
Hewlett, Richard F.
Design of drill-hole grid spacings for evaluating low-grade copper deposits.
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1965
(OCoLC)609335286
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Richard F Hewlett; United States. Bureau of Mines.; Bear Creek Mining Company.; University of Arizona. State Bureau of Mines.; University of Arizona. College of Mines.
OCLC Number: 10380587
Notes: Performed in cooperation wth the Bear Creek Mining Co., and the Bureau of Mines and the College of Mines, University of Arizona.
Distribution made by issuing office.
Description: ii, 46 pages : illustrations ; 27 cm.
Contents: Abstract --
Introduction and summary --
Acknowledgements --
Drilling cost and precision --
Deposit parameters --
Simulated deposits --
Known deposits --
Applications --
Methodology --
Standard error of the mean --
Drilling requirements --
Specific examples --
Designed experiment --
OK Copper deposit --
Christmas deposit --
Kimbley deposit --
Summary --
Generalization.
Series Title: Report of investigations (United States. Bureau of Mines), 6634.
Other Titles: Design of drill hole grid spacings for evaluating low-grade copper deposits
Responsibility: by Richard F. Hewlett.

Abstract:

This report describes how a limited number of preliminary exploration drill-hole assays from a mineral deposit can be used to design grid spacing that is both economic and efficient for subsequent evaluation drilling of that deposit. Relationships between desired precision of the estimate of grade of ore and drilling cost are used to determine the economic drill-hole spacing. The statistical concept of precision in estimating grade of ore is used to determine the efficient drill-hole spacing. Assay data from approximately 50 known copper deposits were studied, and the relationships of the statistical parameters of these deposits were computed. Drilling requirements for various precisions of the estimates of grade of ore were computed for some of these known deposits to serve as guides for drilling future copper deposits. The effect of various geologic factors on the trend in grade of ore and, therefore, on the drilling requirements is shown for certain deposits.

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