DMF is involed in Mining in USA and Africa Metals (iron, copper, steel, uranium) Precious metals (gold, silver, platinum) Minerals (sulfur, crushed stone, cement, gravels, industrial sand) DMF mining industry has survived downward shifts in industry and even the pandemic by changing and adapting as times evolved. Fact remains, the products produced through mining provide the foundation for nearly all manufacturing. Today, there are nearly 13,000 active mines in the US as of 2019, valuing at $61 billion.