Placer deposit - Wikipedia
网页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. [1] . The name is from the Spanish word placer, meaning " alluvial sand".
Placer mining - Wikipedia
网页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).
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Placer deposit | Alluvial Mining, Geology & Formation
网页Placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles. When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into …
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Types of Placers - 911Metallurgist
网页2016年10月23日 · Gulch placers: Gulch placers are characteristically small in area, have steep gradients and are usually confined to minor drainages in which a permanent stream may or may not exist. This type of placer is, as a rule, made up of a mixture of poorly sorted gravel and detritus from adjacent hillsides.
What Is Placer Gold?: Guide (Types of Gold Placers, Placer Mining ...
网页Placer gold is gold that has broken loose from the main lode, as a result of weathering and erosion. Placers can be found both close to and far from the gold lode, depending on the forces at play. One example is placer gold that gets into a river, where it can travel thousands of miles downstream.
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PLACER Definition & Meaning | Dictionary.com
网页Placer definition: a surficial mineral deposit formed by the concentration of small particles of heavy minerals, as gold, rutile, or platinum, in gravel or small sands.. See examples of PLACER used in a sentence.
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