Metals from Ores: An Introduction by Fathi Habashi-Crimson Publishers
A mineral is a naturally occurring substance having a definite chemical
composition, constant physical properties, and a characteristic crystalline
form. Ores are a mixture of minerals: they are processed to yield an industrial
mineral or treated chemically to yield a single or several metals. Ores that
are generally processed for only a single metal are those of iron, aluminium,
chromium, tin, mercury, manganese, tungsten, and some ores of copper. Gold ores
may yield only gold, but silver is a common associate. Nickel ores are always
associated with cobalt, while lead and zinc always occur together in ores. All
other ores are complex yielding a number of metals.
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