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> About 2.6 Million tons of alumina were imported to make up about 35% of
the
> US demand from Australia, Suriname and Jamacia.
Indeed so, but alumina is an intermediate product refined from bauxite.
Bauxite is the ore that is mined.
> Cement, as clinker and cement for portland cement make up a major part of
our
> cement industry and consumed about 119 million tons of limestone and 24.6
> million tons of argillaceous minerals. (Look it up Mining Engineering
June
> 2000 p. 33.
Indeed so, but it is the limestone, etc which is quarried.
In my interpretation, both cement and alumina are manufactured using mined
commodities as feedstocks. If you prefer the interpretation that alumina and
cement are mined commodities, you have the problem of what to call a cement
works or an alumina refinery - are these mines (or quarries?). Don't think
so...
Martin
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