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Concentration Of Metals Associated With The Native Copper Deposits Of Northern Michigan, Daniel R. Blakemore, C. Renee Sparks, Nathaniel H. Bos
Concentration Of Metals Associated With The Native Copper Deposits Of Northern Michigan, Daniel R. Blakemore, C. Renee Sparks, Nathaniel H. Bos
The Compass: Earth Science Journal of Sigma Gamma Epsilon
The Keweenaw Peninsula of northern Michigan is home to the largest accumulation of native copper in the world. Native copper deposits are hosted in the 1.1 billion-year old midcontinent rift which extends from Kansas, up through Lake Superior, around into lower Michigan, but is only exposed in the Keweenaw region. Native copper is found in the vesicular and brecciated flow tops of the volcanism associated with this rift, within the interflow conglomerate that developed in-between individual flows, and also minor native copper deposits are found with the copper sulfide deposits in the Nonesuch Shale. The purpose of this study was …