USA HISTORY

Detailed explanation-1: -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.

Detailed explanation-2: -gold digger, gold miner, gold panner. a miner who digs or pans for gold in a gold field. placer miner. a miner who extracts minerals from a placer by washing or dredging. prospector.

Detailed explanation-3: -Unlike hardrock mining, which extracts veins of precious minerals from solid rock, placer mining is the practice of separating heavily eroded minerals like gold from sand or gravel. The word placer is thought to have come from Catalan and Spanish, meaning a shoal or sand bar.

Detailed explanation-4: -Placers are a type of mineral deposit in which grains of a valuable mineral like gold or the rare earths are mixed with sand deposited by a river or glacier. Placer is also a mining method term. Placer mining uses water and gravity to separate gold from surrounding material.

Detailed explanation-5: -The bucket-ladder, or bucket-line, dredge has been the traditional placer-mining tool, and it is still the most flexible method for dredging under varying conditions.