Top 10 similar words or synonyms for placer_mining

prospecting    0.763655

mining    0.714159

comstock_lode    0.685875

diggings    0.679235

placer_deposits    0.674496

sluicing    0.651295

prospectors    0.649390

prospected    0.641699

lodes    0.641292

pinos_altos    0.636183

Top 30 analogous words or synonyms for placer_mining

Article Example
Placer mining 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 metal or gemstones, having been moved by stream flow from an original source such as a vein, are typically only a minuscule portion of the total deposit. Since gems and heavy metals like gold are considerably more dense than sand, they tend to accumulate at the base of placer deposits.
Placer mining The word placer derives from the Spanish "placer", meaning shoal or alluvial/sand deposit, from Catalan "placer", (shoal), from "plassa", (place) from Medieval Latin "placea" (place) the origin word for "place" and "plaza" in English. The word in Spanish is thus ultimately derived from "placea" and refers directly to an alluvial or glacial deposit of sand or gravel.
Placer mining Placers supplied most of the gold for a large part of the ancient world. Hydraulic mining methods such as hushing were used widely by the Romans across their empire, but especially in the gold fields of northern Spain after its conquest by Augustus in 25 BC. One of the largest sites was at Las Médulas, where seven 30 mile long aqueducts were used to work the alluvial gold deposits through the first century AD. (Inclusions of platinum-group metals in a very large proportion of gold items indicate that the gold was largely derived from placer or alluvial deposits. Platinum group metals are seldom found with gold in hardrock reef or vein deposits.)
Placer mining Placer mining continues in many areas of the world as a source of diamonds, industrial minerals and metals, gems (in Myanmar and Sri Lanka), platinum, and of gold (in Yukon, Alaska and British Columbia).
Placer mining The simplest technique to extract gold from placer ore is panning. In panning, some mined ore is placed in a large metal or plastic pan, combined with a generous amount of water, and agitated so that the gold particles, being of higher density than the other material, settle to the bottom of the pan. The lighter gangue material such as sand, mud and gravel are then washed over the side of the pan, leaving the gold behind. Once a placer deposit is located by gold panning, the miner usually shifts to equipment that can treat volumes of sand and gravel more quickly and efficiently.