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<br /> <br /> <br />A line of ingot molds at right ready to 'be filled with <br />molten steel from the. open.hearth furnaces in the back- <br />ground. <br /> <br />the value of its annual mineral output. Of the <br />tptal, about 43 percent has come from petroleum <br />and coal and related products; about 21 percent <br />has come from gold and silver; about 13 percent <br />has come from the ferroalloys-molybdenum, <br />vanadium, and tungsten; about 10 percent has <br /> <br /> <br />Molten iron from a Pueblo, Colorado, blast furnace <br />pours into the open top of a basic oxygen furnace where <br />it will be converted into steel. <br /> <br />come from the base metals-lead, zinc, and <br />copper; about 2 percent has come from uranium; <br />and about 11 percent has come from minor metals <br />nonmetallic minerals, and construction materials. <br />Colorado's reserves of stone, sand, and gravel <br />appear limitless. Other nonmetallics and low- <br /> <br />I <br />i, <br />'I <br />II <br />I' <br />I' <br />I <br />i{ <br />I <br /> <br />39 <br />