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Placer mining (/ ˈ p l æ s ər /) [1] is the mining of stream bed deposits for minerals. [2] This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment.
Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers. [2] Placer materials must be both dense and resistant to weathering processes. To ...
This page was last edited on 13 January 2019, at 19:23 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
This page was last edited on 24 January 2020, at 19:51 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Dầu Tiếng Lake is an artificial lake in the three provinces of Tây Ninh, Bình Dương, and Bình Phước in the Southeast region, Vietnam. The lake was formed by damming the upper reaches of the Saigon River, making it the largest irrigation reservoir in Vietnam and Southeast Asia. Construction of the lake began in 1981 after surveys ...
Mining Claim Corner, Blue Ribbon Mine, Alaska. A placer claim is a mining claim on gravel or ground from which minerals are extracted using water. [1] In the United States, the valuable mineral in a placer claim is almost always gold, although other nations mine placer deposits of platinum, tin, and diamonds.
This page was last edited on 2 November 2019, at 04:41 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
The gold uncovered from the town's underground river channels and placer mines contributed to the Union's success during the American Civil War. [32] Chili Gulch was the richest placer mining section in Calaveras County. [33] Mokelumne Hill was the richest placer mining section of Calaveras County and one of the principal mining towns of ...