![]() ![]() Peele’ s Mining Engineers’ Handbook is another general reference of considerable value. Charles Janin’s “Gold Dredging in the United States” is an excellent general reference although written 50 years ago. There are no current publications that describe modern design and operation of dredges. The risk involved can be reduced by a thorough exploration program balanced with a sound engineering study. Like any mineral deposit, a placer deposit should be evaluated on the basis of the most practical and efficient system suited to it. It provides data concerning current application and identification of the natural and unchangeable environmental conditions to be considered in selecting a system. It brings together the old and proven dredging concepts with newer and more current techniques integrating these ideas with actual cost experience standardized to 1967. This report is focused on placer mining by dredging. Emphasis was given to large deposits which would permit the economies of large-scale production methods. Two gold dredges and one platinum dredge were still operating in Alaska.īecause of the increasing national requirements for gold the Bureau of Mines in 1966 initiated a Heavy Metals study to investigate and appraise potential gold-bearing deposits that might contribute to domestic gold production. Gold dredging in the adjacent States had already ceased because of increasing operating costs, decreasing placer values, and the fixed price of gold. The last gold dredge in California stopped operating in October 1968. ![]() At present dredge mining in this country is at a low level. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |