(mining) Rock containing ore from which minerals are extracted.
The federal system for "hardrocks," pursuant to the Mining Law of 1872, allows the discovery, location, and development of these minerals without payment to the federal government.
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(geology) Solid, nonporous rock.
Reflection coefficients calculated from impedance contrasts between felsic and mafic rocks and other common lithologies in hardrock terranes often exceed 6%, the estimated minimum value required to give strong reflections.
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A type of concrete that contains relatively small amounts of aggregate relative to the amount of cement.
In this context, you asked us to provide information on (1) which types of royalties the 12 western states assess on hardrock mining operations and (2) trends on imports and exports of hardrock minerals.
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