Timeline of mining in Colorado

Colorado mining history is a chronology of precious metal mining (e.g., mining for gold and silver), fuel extraction (e.g., mining for uranium and coal), building material quarrying (iron, gypsum, marble), and rare earth mining (titanium, tellurium). The Uravan Mineral Belt (UMB) is on the west side of the state, and the Colorado Mineral Belt (COMB) is a large area of the state that had gold/silver booms.

Source: Wikipedia — Timeline of mining in Colorado (CC BY-SA 4.0)