| Reference | {Deposit:: BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP}{Deposit:: CORNWALL, H.R., AND WRIGHT, J.C., 1954, BEDROCK GEOLOGY OF THE EAGLE HARBOR QUADRANGLE, MICHIGAN; USGS MAP GQ-36, SCALE 1: 24000}{Production:: BUTLER AND BURBANK, 1929; CORNWALL AND WRIGHT, 1954} |