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Originally posted by wangyl86 at 2009-10-15 09:29:
A concentration of naturally occurring solid,liquid, or gaseous material in or on the Earth¡¯s crust in such form and amount that economic extraction of a commodity from the concentration is currently or potentially feasible.

Originally posted by echommm at 2009-10-15 09:53:

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Originally posted by slowstar at 2009-10-15 10:22:
A concentration( of naturally occurring solid,liquid, or gaseous material in or on the Earth¡¯s crust )in such form and amount that economic extraction of a commodity from the concentration is curr ...

Originally posted by wangyl86 at 2009-10-15 10:30:



A concentration of naturally occurring solid,liquid, or gaseous material in or on the Earth¡¯s crust in such form and amount that economic extraction of a commodity from the concentration is  ...

Originally posted by slowstar at 2009-10-15 10:38:
A concentration of naturally occurring solid,liquid, or gaseous material in or on the Earth¡¯s crust in such form and amount that economic extraction of a commodity from the concentration is curren ...