The Maritime History of the Great Lakes
Independence (Propeller), 31 Oct 1846

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      Shipment of ores. The Propeller INDEPENDENCE will take down on her next trip the largest cargo of ore that has yet been carried to the Sault Ste. Marie from the Cliff Mine of the Pittsburg and Boston Company. She will receive 200 barrels and from the Lake Superior works, about 30 tons, including a boulder of copper weighing 1756 lbs. Found on the shaft of the latter company, near where their pure copper boulder was recently discovered, and some 40 to 45 ft. below the surface of Eagle River. The copper of the boulder just taken out, is pronounced by good judges to be much purer than the manufactured article generally found in market, besides containing some silver. This copper is estimated being worth 20 cents per pound which would make the value of the entire rock at 351.40 (dollars or pounds). Exclusive of the percent of silver is sufficient to defray the whole expense of getting the metal into market. (Lake Superior news).
      Cleveland Plain Dealer
      Monday, August 31, 1846

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cargo of iron ore
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William R. McNeil
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Maritime History of the Great Lakes
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Independence (Propeller), 31 Oct 1846