Placer Deposits Form When. 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” deposits are formed by surface weathering and ocean, river or wind action resulting in concentration of some valuable heavy resistant minerals of economic quantities.
PLACER TYPE DEPOSITS
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 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 placer can be an accumulation of valuable minerals formed by gravity separation during sedimentary processes. 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. Typically, placers form where a stream’s velocity slows on point bars, in braided streams, or in alluvial fans (figure 9.92). Heavy eroded particles settle out of moving water. Mineral deposits formed as a result of gravity separation based on density are called placer deposits. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are. 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 deposits naturally accumulate heavy, valuable minerals, which are formed by the gravitational effect during sedimentary processes. 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 deposits result from weathering and release of gold from lode deposits, transportation of the gold, and concentration of the gold dominantly in stream gravels. Placer deposits form when heavy eroded particles settle out of moving water. 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. Unless preserved by burial, a placer subsequently may be eroded, and either dispersed or reconcentrated. Web mineral found in placer deposits. The word placer is spanish for alluvial sand. The name is from the spanish word placer , meaning alluvial sand. 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 so, placer deposits, also just called placers, form when one or more minerals concentrate in this way to become an ore deposit.
