defination of metalic source ?
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Metals occur in all kinds of rocks but usually in concentrations that are too low to be mined. Metallic ore deposits, however, are relatively rare concentrations of metal‐bearing minerals (usually sulfides) that contain enough metal to be profitably mined. Again, the profit line is dependent on a number of economic factors. Our most important metals are iron, copper, aluminum, lead, zinc, silver, gold, chromium, nickel, cobalt, manganese, molybdenum, tungsten, vanadium, tin, mercury, magnesium, platinum, and titanium.
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a type of solid substance that is usually hard and shiny and that heat and electricity can travel through
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