Heavy mineral placers

Heavy mineral placers Heavy mineral placer deposit is defined as “Alluvial, [Material (minerals or rocks) transported by rivers and deposited usually at points along the flood plane of river], Elluvial, [Material which is still at or near the points of its formation] and Colluvial [Material which is transported by gravity], which contains economic quantities of valuable minerals such as gold, tin and platinum etc. Placer deposit can also be defined as a “mineral deposit formed by the process of mechanical concentration of mineral particles from weathered debris”. These heavy minerals (Table 1) have higher specific gravity (>2.8) and are resistant to chemical and mechanical attack than ordinary rock forming minerals.