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"Underground city" copper mine in Minnesota inches forward

Andrew Topf | March 29, 2012 | 5:43 am Base Metals Precious Metals Africa Europe Copper Gold Nickel 

A proposal for a large underground copper mine in Minnesota reached a milestone last week. Twin Metals Minnesota LLC - a joint venture beween Duluth Metals and Chilean company Antofagasta Plc - said on March 21st that it has engaged...

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