1850 More Copper From the Mines
Lake Superior Journal 10-2-1850
The pioneer steamer of Lake Superior, the copper-carrying Propeller Independence, Capt. John Halloran, brings down at every trip a cargo of the rich metal. She came in on the 28th ult with 140,000 lbs of mass and barrel copper—about 12 tons being from the North American, 24 tons from the North West and the balance from the Cliff.