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