Placer Deposits Form When. Mineral deposits formed as a result of gravity separation based on density are called placer deposits. Web so, placer deposits, also just called placers, form when one or more minerals concentrate in this way to become an ore deposit.
(PDF) Placer Mineral Deposits
Unless preserved by burial, a placer subsequently may be eroded, and either dispersed or reconcentrated. 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. When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into. The word placer is spanish for alluvial sand. 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). 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 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. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are. Heavy eroded particles settle out of moving water.
The placer can be an accumulation of valuable minerals formed by gravity separation 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 deposits result from weathering and release of gold from lode deposits, transportation of the gold, and concentration of the gold dominantly in stream gravels. The placer can be an accumulation of valuable minerals formed by gravity separation during sedimentary processes. Unless preserved by burial, a placer subsequently may be eroded, and either dispersed or reconcentrated. 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. 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. Mineral deposits formed as a result of gravity separation based on density are called placer deposits. Placer deposits naturally accumulate heavy, valuable minerals, which are formed by the gravitational effect during sedimentary processes.
