Egbert L Viele apparently formed this mining company to manage his interests in mines in Colorado, at least one of which, the Bosco mine, is located in Leadville. In the following article, the geology of the Gray Porphyry Belt is detailed. With these Google readers, you can read right in the window,but it's a little cumbersome. If you click on 'Books' at the lower left hand corner, you will go to Google Books and be able to read a larger format.
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