Answer
Minerals accumulate in placers through the process of "placer mining." Placer deposits are formed by the mechanical concentration of heavy minerals, particularly through the action of water. As water flows over mineral-bearing rocks, it erodes and transports the denser minerals downstream, leaving them behind in areas of reduced water velocity, such as riverbeds, beaches, or river deltas. Four minerals commonly mined from placer deposits are gold, tin, diamonds, and platinum. These minerals are often found concentrated in alluvial deposits, beach sands, and river gravels.
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