2011 GSA Annual Meeting in Minneapolis (912 October 2011)
443 Thursday, 13 October 2011
7:30 AM-10:30 PM, Minneapolis Convention Center: Ballroom A Foyer, 2nd Ave. Entrance

Copper Deposits of the Western Upper Peninsula, Michigan **CANCELLED**

Primary Leader: Theodore J. Bornhorst
Field Trip Description: This field trip will provide participants with a broad understanding of the rock units and structures of the Michigan segment of the Midcontinent rift system and their context with respect to copper deposits. Native copper deposits are hosted by rift-filling volcanic rocks and interbedded sedimentary rocks and were mined between 1845 and 1968 (~5 billion kg Cu cumulative production). These deposits will be studied by observations and collecting at surface mine rock piles and underground at the Caledonia Mine. Historic aspects of the mining district will be covered by stops. A rift-filling shale-hosted stratiform chalcocite-dominated deposit, with lesser amounts of native copper, was exploited from 1953 to 1996 at the White Pine Mine (~1.7 billion kg Cu total production). A second rift-filling sediment-hosted chalcocite-dominated (lacking native copper), Copperwood project, occurs in the same stratigraphic position about 30 km southwest of the White Pine Mine. This property is being actively developed by Orvana Minerals Corp with measured and indicated Cu of 480 million kg as of January 2011. Recent drill core from Copperwood will be studied. Discussion will include genetic models for the several deposits in this world-class copper district.
Field Trip will span: 3 days
Sponsor(s): A potential sponsor could be the Society of Economic Geologists

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