Produced by Robert J. Hall
PRINCIPLES OF MINING
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| Published by the |
| McGraw-Hill Book Company |
| New York |
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| Successors to the Book Departments of the |
| McGraw Publishing Company Hill Publishing Company |
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| Publishers of Books for |
| Electrical World The Engineering and Mining Journal |
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| Metallurgical and Chemical Engineering |
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PRINCIPLES OF MINING
VALUATION, ORGANIZATION AND ADMINISTRATION
COPPER, GOLD, LEAD, SILVER, TIN AND ZINC
BY
HERBERT C. HOOVER
_Member American Institute of Mining Engineers, Mining and Metallurgical
Society of America, Société des Ingénieurs Civils de France, Fellow
Royal Geographical Society, etc._
First Edition
_FOURTH THOUSAND_
McGRAW-HILL BOOK COMPANY
239 WEST 39TH STREET, NEW YORK
BOUVERIE STREET, LONDON, E.C.
1909
PREFACE.
This volume is a condensation of a series of lectures delivered
in part at Stanford and in part at Columbia Universities. It is
intended neither for those wholly ignorant of mining, nor for those
long experienced in the profession.
The bulk of the material presented is the common heritage of the
profession, and if any one may think there is insufficient reference
to previous writers, let him endeavor to find to whom the origin
of our methods should be credited. The science has grown by small
contributions of experience since, or before, those unnamed Egyptian
engineers, whose works prove their knowledge of many fundamentals
of mine engineering six thousand eight hundred years ago. If I
have contributed one sentence to the accumulated knowledge of a
thousand generations of engineers, or have thrown one new ray of
light on the work, I shall have done my share.
I therefore must acknowledge my obligations to all those who have
gone before, to all that has been written that I have read, to
those engineers with whom I have been associated for many years,
and in particular to many friends for kindly reply to inquiry upon
points herein discussed.
CONTENTS.
CHAPTER 1.
Valuation of Copper, Gold, Lead, Silver, Tin, and Zinc Lode Mines
Determination of average metal content; sampling, assay plans,
calculations of averages, percentage of errors in estimate from
sampling.