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<br /> <br />j <br />i <br />f <br />I <br /> <br />..".'.l... <br />:< <br />'. <br /> <br />Mineral Resources <br />of Colorado <br /> <br />In the early days, Colorado's mineral weal <br />came principally from gold, silver, and Ie: <br />Later, zinc, copper, coal, clays, and cern( <br />became major products, and in the last 30 ye. <br />petroleum, natural gas, molybdenum and u <br />nium have come to the forefront. <br />Colorado has thus far produced $7 billion <br />mineral wealth, and this total is at prest <br />increasing at the rate of about $350 million. <br />year. The State stands 17th in the Nation <br /> <br />38 <br />