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The year 1895 marked a climax in the Penrose career. In January he reached the peak of his academic life, when a letter from William R. Harper, president of the University of Chicago, notified him that he had been promoted to a full professorship in economic geology in that institution. In December, the partners, Penrose and Barringer, together with John M. Brock-man began mining operations at what later became Pearce, Arizona, and Penrose was elected president of the company, known as the Common-Wealth Mining and Milling Company, which mined gold and silver in Cochise County, some 25 miles from the old town of Tombstone.Barringer had known Brockman as far back as the fall of 1891, and perhaps even earlier. In a report which Barringer made for Henry C. Butcher, of Philadelphia, dated September 18, 1891, he says, “As prearranged, I met Mr. R. L. Heflin at Deming, and with him went to Silver City, eight or nine miles south east of which the mine is situated. In company with Mr. Heflin and Mr. John Brockman, I spent three days upon the property and in the immediate neighborhood of the same.” He speaks of the exploratory work having been done by Heflin and Brockman, and in conclusion recommends the purchase of the property. This may, or may not, have been Barringer’s introduction to Brockman. In any event, Penrose was in Silver City in March and April of the following year and undoubtedly saw Brockman at that time, if not before.

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