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$PURR REPORT <br />Intense glaciation is indicated by morainal material on <br />granite [Precambrian] hills east of Smuggler mountain at <br />elevations of 11,000 ft.+, and the presence of 400 ft. <br />of glacial drift in the Park-Regent and Bushwacker <br />shafts on Smuggler mountain at an elevation of 10,000 <br />ft. <br />.T. E. SPURR, ORE DEPOSITION AT ASPEN, COLORADO, 4 ECONOMIC GEOLOGY 301-320 <br />(1909) (the "$PURR REPORT"). <br />Spurr's report is an elaboration and clarification, with <br />some modification, of his earlier theories on ore <br />deposition, particularly with regard to relationships <br />between the breccias and faulting in the Mollie Gibson- <br />Smuggler-Della S. complex. <br />Deposition of ore in the Smuggler Mine, pp. 311-314. Spurr <br />proposes that movement on the Clark fault began prior to <br />mineralization, resulting in a displacement {vertical <br />component) of 350 ft. before ore deposition; continued <br />through three distinct mineralization stages; and continued <br />after mineralization, with a total post mineralization <br />vertical offset of an additional 400 ft., p. 312. <br />Three stases of mineralization, pp. 313-314. Spurr <br />recognizes three stages of mineralization. First was the <br />deposition of barite in regular veins, essentially following <br />stratification, along and near the bedding faults (Contact, <br />Silver), with evidence in places of barite having been <br />formed in open fissures. Second, following immediately and <br />with no discernible break from the first stage, was the <br />deposition of sulfides, silver antimony and silver arsenic <br />sulfides (poly6asite, argentite, tetrahedrite, tennantite), <br />silver and copper. These minerals filled small crevasses in <br />the barite veins, veins separate from and clearly subsequent <br />to the barite, and in some places intercrystallized with <br />barite. The trend of the main silver sulfide ore shoots, <br />limited in extent and clean cut, was different from the <br />barite veins, being nearly east-west. Third, marked but <br />probably not very extensive movement took place along the <br />"bedding" faults (Contact and Silver), producing a strongly <br />brecciated zone along the faults involving much of the <br />barite veins and rich silver sulfides near the faults; <br />rising waters deposited large amounts of galena, very low in <br />Bruce A. Collins - 9 - BIBLIOGRAPRY <br />