CHAPTER I. 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. The following discussion is limited to in situ deposits of copper, gold, lead, silver, tin, and zinc. The valuation of alluvial deposits, iron, coal, and other mines is each a special science to itself and cannot be adequately... more...

To the Senate and House of Representatives: The Constitution requires that the President "shall, from time to time, give to the Congress information of the state of the Union, and recommend to their consideration such measures as he shall judge necessary and expedient." In complying with that requirement I wish to emphasize that during the past year the Nation has continued to grow in strength; our people have advanced in comfort; we have gained... more...