Placer Gold Deposits of Nevada 作者:Johnson, Maureen G. 出版年:2011-5 页数:128 定价:$ 14.63 ISBN:9780984369898 豆瓣评分 目前无人评价 评价: 写笔记 写书评 加入购书单 分享到 推荐 论坛· ··· 在这本书的论坛里发言
Gold ores, Placer depositsO H MetzgerJohnson, M.G., 1973, Placer gold deposits of Nevada: U.S. Geological Survey Bulletin 1356, 118 p.Johnson, M. G., 1973, Placer gold deposits of Nevada: U.S. Geological Survey Bulletin 1356, 118 p....
Gold is present both in bedrock lode deposits... OD Christensen,CD Henry,J Wood - Geological Society of Nevada S Symposium 被引量: 0发表: 2015年 PLACER DEPOSITS OF THE MANHATTAN DISTRICT, NEVADA. By HENRY G. FERGUSON During the field season of 1915 the writer spent four months in the ...
Define Placer gold. Placer gold synonyms, Placer gold pronunciation, Placer gold translation, English dictionary definition of Placer gold. n. The obtaining of minerals from placers by washing or dredging. placer miner n. American Heritage® Dictionary
Despite extensive diamond mining taking place in the region since the 1930s very little attention had been paid to the alluvial gold deposits. There are a lot of artisanal miners active in the area but their sole focus is diamonds and they often discard the gold that they dig up. That fact...
A dredge for mining metals from placer deposits; it consists of a chain of closely connected buckets passing over an idler tumbler and an upper or driving tumbler, mounted on a structural-steel ladder which carries a series of rollers.McGraw...
Take a look in here to learn more about the geology of gold deposits, both placer and hard rock. Commercial Mining Equipment Commercial placer mining operations have different equipment than the typical individual prospector, but then they are processing huge amounts of gravel. Take a look here ...
Placer Dome plans to develop 16-mil oz gold reserves: CEO During the third quarter ended Sep 30, the company decided to proceed with the development of Cortez Hills gold project in Nevada and Pueblo Viejo in the Dominican Republic. Together the projects contain proven and probable reserves of ...
placer gold placer词组 placer gold砂金;沙金 placer deposit砂矿床;砂积矿床;砂砾矿床 placer mining砂矿开采;淘金 placer_体育行业词汇 善于控制落点的球员 放置定位球的队员 placer_地质学行业词汇 砂矿床 placer_金融行业词汇 投资者 投保者 保险安排人 ...
small holes are driven in order to extract the ore (e.g., gold) as cheaply as possible. In placer mining no excavation is involved; instead, gravel, sand, or talus (rock debris) is removed from deposits by hand, hydraulic nozzles, or dredging. The ore is separated from the waste by...