In a message dated 7/9/00 7:16:45 PM, [log in to unmask] writes:
<< Just being picky, but as far as I'm aware no-one has ever mined (or
quarried) alumina or cement!! >>
About 2.6 Million tons of alumina were imported to make up about 35% of the
US demand from Australia, Suriname and Jamacia.
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.
mason
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