800 MINERAL RESOURCES, 1915—PART I.
per
cent in South Dakota, and cyanidation produced 42.7 per cent in
Arizona, 53.4 per cent in Colorado, 70.7 per cent in Nevada, 34.1 per
cent in New Mexico, and 35.7 per cent in South Dakota.
Of
the total output of silver from all sources in 1915 amalgamation
produced 31.8 per cent in South Dakota and 19.8 per cent in Oregon, and
cyanidation produced 86.2 per cent in Nevada, 56.2 per cent in New
Mexico, 66.4 per cent in South Dakota, and 98.5 per cent in Texas.
For
details of the consumption of quicksilver in the amalgamation milling
process and of potassium cyanide and sodium cyanide in the cyanidation
process the reader is referred to the mines reports of the several
Western States indicated in the prefatory note. Data as to consumption
of these supplies are not yet furnished by a sufficient number of
mining and milling companies to justify tabulation for the entire
United States. It has been estimated by H. D. Mc-Caskey that the annual
consumption of quicksilver in the amalgamation process in the United
States (including Alaska) for the period 1911 to 1915, inclusive, has
varied between 90,000 and 100,000 pounds.
