An alluvial deposit is AN ancient river-washed rock and gravel bar that will be thousands of feet from the nearest stream, creek, or river. sediment (or bench) deposits contain untapped potential for locating gold because such areas haven't been worked before.
Alluvial placers ar typically remnants of deposits fashioned throughout AN earlier stage of stream development and left behind as the stream cuts downward. The abandoned segments, significantly those on the hillsides, ar commonly brought up as "Bench" Graves. oft there ar two or additional sets of benches within which case the miners refer to them as "high" benches and "low" benches.

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