A placer deposit, also known as an alluvial deposit, is a valuable source of geological and mineral resources. These types of deposits are formed over time through natural processes such as weathering, erosion, and sedimentation. Other names for placer deposits include streambeds, alluvial fans, and river terraces. These deposits contain a variety of minerals such as gold, silver, platinum, tin, and diamonds. They are typically found in river valleys, deltas, and coastal areas. The extraction of minerals from placer deposits requires specialized equipment and techniques such as panning, dredging, and sluicing. Synonyms for placer deposit may include sedimentary deposit, stream deposit, and heavy mineral deposit.