oct 13, 2020 We also mine metal, including copper, iron, gold, silver, zinc, and other essential substances. We mine material that are very important for agricultural, chemical, construction, manufacturing, and other sectors. technically we are the backbone of the u.s economy.this is the gold collected in a bucket over three months. sort the gold into circuits that need cleaning, gold plated parts, gold plated pins, gold fingers, and solid gold large and small. use a magnet to separate all gold plated steel this needs a different process than am demonstrating.