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<p>[QUOTE=&quot;calcol, post: 3218163, member: 77639&quot;]Yes, expressed as percent of the earth&#039;s crust, the rare earth metals are more common than mercury, cadmium and silver.&nbsp; Some are as common as copper, nickel, zinc and lead. The biggest problem is that they are well distributed, so concentrated ores are scarce. And, yes, extraction procedures are expensive too.</p><p><br /></p><p>Last operating mine in the US was the Mountain Pass Mine in Calif.&nbsp; It and the processing facility could be re-opened with a government subsidy.&nbsp; A less expensive plan would be for the government to pay to keep them in readiness, but not pay for actual operation at present.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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