Placer tin deposit in xupu occurs in alluvial sediment of quatemary system and cassiterite chiefly concentrates at the bottom of gravel layers.
溆浦砂锡矿床赋存在第四系冲积层中锡石主要富集在底部砂砾石层。
2
Separated from the deposit and scattered on the river side of the foundation rock, and gradually be covered with sand, forming alluvial sand.
自矿床分离而散落于溪旁基础岩石上，逐步被沙土覆盖，形成冲积性砂。
3
By the study of the feature of alluvial gold conjuncture, its haul distance was determined, the types of its Primary deposits assessed and the target area for ProsPecting Primary deposit defined.