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Michigan's UP ISLE ROYAL
The works, generally pits of from ten to thirty feet in diameter, and from twenty to sixty feet in depth, are found scattered throughout the island, wherever examined being sunk through the few feet of superincumbent drift, where it exists, into the amygdaloid copper-bearing rock. They invariably are on the richest veins; and the intelligence displayed in the tracing and following of the veins when interrupted, etc., has •elicited the astonishment of all who have witnessed it—no mistakes having apparently been made in this respect. These excavations are connected under ground, drains being cut in the rock to carry off the water. Slopes one hundred feet in length are found. A drain sixty feet long presented some interesting features; having been cut through the surface drift into the rock, it had evidently been covered for its entire length by timbers felled and laid across. When opened, the timbers had mostly decayed, and the center portions had sunk into the cavity, filling it for nearly its entire length with the rotted wood.
Upper Penisula
Page 3
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