Placer Deposits Form When. Mineral deposits formed as a result of gravity separation based on density are called placer deposits. The name is from the spanish word placer , meaning alluvial sand.
PLACER TYPE DEPOSITS
Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are. Web placer deposits result from weathering and release of gold from lode deposits, transportation of the gold, and concentration of the gold dominantly in stream gravels. Web placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles. Web mineral found in placer deposits. Web in geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. Web a placer is any waterborne deposit of sand or gravel that contains concentrated grains of valuable minerals such as gold or magnetite, grains that had originally been eroded from bedrock but were then transported and concentrated by the flowing water. The word placer is spanish for alluvial sand. The placer can be an accumulation of valuable minerals formed by gravity separation during sedimentary processes. Placer deposits naturally accumulate heavy, valuable minerals, which are formed by the gravitational effect during sedimentary processes. Typically, placers form where a stream’s velocity slows on point bars, in braided streams, or in alluvial fans (figure 9.92).
The word placer is spanish for alluvial sand. Placers can be found in rivers (alluvial placers) and on the coast, particularly in beaches. Web placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles. Web “placer” deposits are formed by surface weathering and ocean, river or wind action resulting in concentration of some valuable heavy resistant minerals of economic quantities. Web in geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. Web placer mining ( / ˈplæsər /) [1] is the mining of stream bed ( alluvial) deposits for minerals. Placer deposits form when heavy eroded particles settle out of moving water. Minerals that form placer deposits include precious deposits like gold, platinum, copper, zircon and various gemstones apart from magnetite, ilmenite, chromite, cassiterite, rutile, and native monazite. Heavy eroded particles settle out of moving water. Placer deposits naturally accumulate heavy, valuable minerals, which are formed by the gravitational effect during sedimentary processes. The name is from the spanish word placer , meaning alluvial sand.
