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LOUGHLIN COMMENTS <br />Newberry's report is a brief description of the Aspen <br />district delivered to the Colorado section of the American <br />Institute of Mining Engineers (now the American Institute of <br />Mining, Metallurgical & Petroleum Engineers, but still <br />abbreviated AIMS) in June, 1689. <br />Igneous intrusions, p. 275. The mass of diorite above the <br />blue lime in Aspen mountain is not found on Smuggler <br />mountain.`B The geological structure of Aspen mountain is <br />much more complex than that of Smuggler mountain. <br />Nature of ores, costs, p. 277. The gangue of Aspen ores <br />varies from 908 limestone to 708 barite. The bulk of the <br />ore is very low in lead. The "average" ore being shipped in <br />1888-89 contained approximately 55 ounces of silver per ton, <br />less than 58 lead, and 12-158 barite. The average smelting <br />charge was about $9.00/ton at Denver, with rail freight of <br />$8.00/ton, for a total of $17.00/ton after loading on the <br />railroad. <br />(i. F. LOUGHLIN, ORE DEPOSITION AT ASPEN, COLORADO, DISCUSSION OF $PURR [SPURA <br />MONOGRAPH ] , 4 ECONOMIC GEOLOGY 658-660 (1909) . <br />Loughlin comments on Spurr's article" in the same volume. <br />Loughlin questions Spurr's observation of common angular <br />barite fragments in galena-sphalerite-cemented breccia in <br />the Smuggler mine, p. 659. <br />1e The Aspen mountain sill, found later in the lower Belden <br />Formation, see STEGEN REPORT. <br />is SPURR REPORT. <br />Bruce A. Collins - 13 - BIBLIOGRAPHY <br />