Based on field work done in 1909 and organized into the following sections — Introduction; Outline of Geology; General Geology; Economic Geology — this report was facilitated by numerous mine owners, managers, superintendents, miners, leasers, and prospectors in the district. The Economic Geology section includes descriptions of the character and mineralogy of the ores, type of ore deposits, and descriptions of the mines of Monarch Hill, Taylor Gulch, Cree Camp, and Columbus Gulch. 78 pages. 11 plates. 3 figures. Digital PDF download. B-01D
Excerpted from the report:
The Monarch mining district is in the southwestern part of Chaffee County, Colorado, on the east slope of the Sawatch Range, which forms a part of the Continental Divide. The district may be reached by rail or by tri-weekly stage from Salida, about twenty miles distant. There are two villages in the region, Garfield and Monarch, about a mile and a half apart.
Aside from a three-page article in the Report of the State Geologist for 1883-84, treating chiefly of the Columbus mine, I have seen no description of the region in geological or mining publications. Brief reference to the district is made in several volumes of Mineral Resources of the United States by the United States Geological Survey, and in the reports of the State Geologist, and of the Bureau of Mines of Colorado. Ore was not discovered at Monarch until after the work of the Hayden survey was completed in Colorado, and it appears that the geologists of that organization passed over the region somewhat hurriedly. In 1885 the late George H. Eldridge, of the United States Geological Survey, examined the Madonna mine and surroundings, but his report was not published.