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The Caledonia Mine, owned by Red Metal Explorations, is located near Mass, Michigan (Fig. 1). The Caledonia Mine is southwest of the Mass and Adventure Mines (Fig. 2) within an area of native copper deposits outside of the major deposits of the Keweenaw Peninsula native copper district, some 40 km southwest of a major producer, the Baltic Mine (see Fig. 3 of Bornhorst, this volume). The mines of the Mass area worked the Evergreen, Ogima, Butler, Mass, South Knowlton and Knowlton mineralized flow top lodes, termed the Evergreen Series, over a total strike length of about 5 km. The...

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