alluvial deposit

冲积层，冲积矿床，冲积物，漂砂矿床

同：	[n.] alluvial sediment, alluvion, alluvium

Many minerals are found in alluvial deposits of sand, clay, or gravel. They have been carried along and then laid down by flowing water.
许多矿物都是在砂土、泥土或砾石冲积矿床中发现的。这些矿物被流水搬运并随之沉积下来。收藏
Mechanized placer mining, with special devices for washing and separating waste from valuable minerals, is used in productive alluvial deposits.
机械化砂矿开采用于含矿量丰富的砂矿床．利用专门设备来淘洗、分离废物与有用矿物。收藏
Alluvial deposits/soil/plains
冲积物/土/平原收藏
Placer mining: Oldest method of recovering gold from alluvial deposits.
砂矿开采:从冲积层回收黄金的最古老方法。收藏
The farmers found the alluvial deposits at the mouth of the river very fertile
农民发现这条河口底下的沉积物很肥沃。收藏

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clay or silt or gravel carried by rushing streams and deposited where the stream slows down
[同] alluvial deposit, alluvial sediment, alluvion, alluvium

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