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Lake Superior
One pit, opened by Mr. Knapp, is thus described by Professor Foster: " When he had penetrated to the depth of eighteen feet he came to a mass of native copper, ten feet long, three feet wide, and nearly two feet thick, and weighing over six tons. On digging round the mass, it was found to rest on billets of oak, supported by sleepers of the same material. The wood, from its long exposure to moisture, was dark-colored and had lost its consistency. It opposed no more resistance to a knife blade than so much peat. The earth was so firmly packed as to support the mass of copper. The ancient miners had evidently raised it about five feet and then abandoned the work as too laborious. The number of ancient (stone) hammers he took from this and other excavations exceeded ten cart loads.
XX I would imagin the Anthropologists of today would like to have those "10 cart loads of tools" XX
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