Placer Deposits Form When. 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.
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The word placer is spanish for alluvial sand. 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. When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into. Unless preserved by burial, a placer subsequently may be eroded, and either dispersed or reconcentrated. Placers can be found in rivers (alluvial placers) and on the coast, particularly in beaches. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are. The name is from the spanish word placer , meaning alluvial sand. 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. 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 mineral found in placer deposits. Web placer mining ( / ˈplæsər /) [1] is the mining of stream bed ( alluvial) deposits for minerals. Placer deposits naturally accumulate heavy, valuable minerals, which are formed by the gravitational effect during sedimentary processes. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are. Typically, placers form where a stream’s velocity slows on point bars, in braided streams, or in alluvial fans (figure 9.92). 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. Unless preserved by burial, a placer subsequently may be eroded, and either dispersed or reconcentrated. Heavy eroded particles settle out of moving water. Web mineral found in placer deposits. Web placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles. The placer can be an accumulation of valuable minerals formed by gravity separation during sedimentary processes.
