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Michigan's UP ISLE ROYAL
it must have taken a long series of years to accomplish the work exhibited; and, if those people withdrew during the lengthy winter season, as has been supposed, it would more than double the period required. An experienced mining captain computed that 200 of those men, with their rude methods, could barely be equivalent to two of our skilled miners. Though no exact estimate can now be made as to the length of time occupied in the prosecution of those extensive works, more or less interrupted as they undoubtedly must have been, yet it does not seem too much to estimate hundreds of years for their accomplishment.
As to the time which has elapsed since the mines have ceased to be worked by this bygone race, a more definite approximation can be reached. Various careful estimates have placed this period from 700 to 800 years.
Upper Penisula
Page 8
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