Hard rock mining is usually done on a large scale, and although a few smallscale hard rock operations still exist, it's ... high capital costs both for the mining equipment to dig and remove the rock as well as the equipment to crush and process hard rock ore in order to extract the gold from its solid rock .
SmallScale Hard Rock Mining With Water Recycling. SmallScale Hard Rock Mining With Water Recycling. March 2015 by Bruce Mann. Once I have established the presence of gold in the sample, I collect fivegallon bucket quantities of the rock material for processing .