>>20295462its not ore their dealing with, its paleo channel gravels. Their working their way down into the ancient river bed of Lightning Creek, one of north america's richest placer gold producing creeks.
The gravel and about 2-3ft of bedrock is scooped up and put through a washplant underground, waste is stockpiled on surface for later backfilling of past mined workings.
Its chunky gold down there too, nuggets over a pound have been recovered from the original Wingdam shaft opposite the modern workings. pic related are miners working at the original wingdam operation in the 1930s or 40s.