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A rocker box (also known as a cradle or a big box) is a gold mining implement for separating alluvial placer gold from sand and gravel which was used in placer mining in the 19th century. It consists of a high-sided box, which is open on one end and on top, [1] and was placed on rockers.
This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and gravel in modern or ancient stream beds, or occasionally glacial deposits ...
The AU Grabber (pronounced as: Gold Grabber; [NB 1]) is a self-propelled barge excavator dredge used to mine Bering Sea placer gold deposits in the region around Nome, Alaska, USA. It is owned and operated by Richard Schimschat and featured in the Discovery Channel USA mining reality TV show Bering Sea Gold .
Dredges were also used to mine placer deposits of other minerals, such as tin ore. [8] In later years, some dredges were electrically powered. [9] A gold dredge was working at Porcupine Flat, near Maldon, Victoria, until 1984. [10] From Australia, in turn, gold dredging technology spread to New Guinea, at the time an Australian territory, in ...
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.
Before any prospectors in Park County began excavating the mountains, they used placer mining to extract gold from the local waterways. Placer mines began to appear all over Park County after 1861. Placer gold was found in Tarryall, Fairplay, Alma, Breckenridge, and Leadville. [10] A notable amount came from the beds of the South Platte River. [11]
Thomas P. Scanlan (1896–1986), was the founder and publisher of the Chicago-based Surplus Record. Mr. Scanlan was a University of Notre Dame graduate. After World War I, he began Surplus Record, which grew into a national trade publication for the used-machinery business which listed used machine tools and capital equipment.
Gold miners excavate an eroded bluff with jets of water at a placer mine in Dutch Flat, California sometime between 1857 and 1870.. The modern form of hydraulic mining, using jets of water directed under very high pressure through hoses and nozzles at gold-bearing upland paleogravels, was first used by Edward Matteson near Nevada City, California in 1853 during the California Gold Rush. [3]
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