The Colorado Mineral Belt The area of Colorado, running from Denver and Boulder heading southwest, is a geologic puzzle. It is loaded with economic ore deposits, and has been a key mining target for nearly 2 centuries. Why all these ore deposits sit here is something of a geologic enigma, and in fact it has even left its mark on the state's map. Denver, Colorado sits very near the northeastern end of the line of mines and the Geological Society of America (GSA) even houses its headquarters nearby in Boulder, Colorado. Why does Colorado host enough mineral mines to redraw their map? The answer is the Colorado Mineral Belt.
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