In chemistry or mining, polymetal or polymetallic is a substance composed of a combination of different metals. When the substance contains only two metals the term bimetal (bimetallic) is sometimes preferred. A (or ) is an ore that is the source of more than one metal suitable for recovery. A mine containing polymetallic ore is a . Concretions of manganese and iron (and other metals) found on the ocean floor are called s. They are sometimes called manganese nodules, after their principal component.
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In chemistry or mining, polymetal or polymetallic is a substance composed of a combination of different metals. When the substance contains only two metals the term bimetal (bimetallic) is sometimes preferred. A (or ) is an ore that is the source of more than one metal suitable for recovery. A mine containing polymetallic ore is a . Concretions of manganese and iron (and other metals) found on the ocean floor are called s. They are sometimes called manganese nodules, after their principal component.
Ore is natural rock or sediment that contains one or more valuable minerals concentrated above background levels, typically containing metals, that can be mined, treated and sold at a profit. The grade of ore refers to the concentration of the desired material it contains. The value of the metals or minerals a rock contains must be weighed against the cost of extraction to determine whether it is of sufficiently high grade to be worth mining, and is therefore considered an ore.