LITERATURE. 
15 
attitude has more than anything else assisted our work. Particularly do we desire 
to express our appreciation of the many courtesies extended to us by the mining 
engineers of the district, including Messrs. Countryman & Jaquith, Hills & Willis, 
Haff & Colwell, Charles J. Moore, and James Smith, of Cripple Creek; and Messrs. 
Davis & Byler and Bodfish & Atherton, of Victor. To the excellent professional 
work of all these and to their hearty personal cooperation we are deeply indebted. 
The chemical division of the Geological Survey has aided us by many detailed and 
careful analyses, made by Messrs. W. F. Hillebrand, George Steiger, and W. T. 
Schaller. 
LITERATURE. 
The following list is intended to include the important publications on the Crip¬ 
ple Creek district, particularly those having some geological or historical signifi¬ 
cance. Articles of less value are scattered through mining journals, and consider¬ 
able information is sometimes obtainable from special mining editions of the local 
newspapers and from the published annual reports of a few of the larger companies, 
such as the Portland and Stratton’s Independence. 
LIST OF PUBLICATIONS ON THE CRIPPLE CREEK DISTRICT. 
Bancroft, George J. Secondary enrichment at Cripple Creek. Engineering and Mining Journal, vol. 74, 
1902, pp. 752-753. 
Suggests that below the zone now worked in the Cripple Creek district there may be a zone of second¬ 
arily enriched ores. It is thought that the occurrence of tetrahedrite in the lower levels of some of the 
mines is indicative of such deep enrichment. This article was followed by a discussion in succeeding 
numbers of the journal. 
Bancroft, George J. The bottom levels at Cripple Creek, Colorado. Engineering and Mining Journal, vol. 
^6, 1903, pp. 86-88. 
A review of conditions at the bottoms of some of the deeper mines, with particular reference to 
drainage and to enrichment or impoverishment of the ore. 
Blake, William P. The gold of Cripple Creek. Engineering and Mining Journal, vol. 57, 1894, p. 30. 
Suggests that the “sylvanite” is probably for the most part calaverite or krennerite. 
Cross, Whitman. Geology of the Cripple Creek gold mining district, Colorado. Colorado Scientific Society, 
Proceedings, vol. 5, 1894-1896, pp. 24-49. 
A preliminary outline, based on field work in 1893 on the Pikes Peak quadrangle. 
Cross, W., and Penrose, R. A. F., jr. The Pikes Peak folio. Geologic Atlas of the United States, folio 7, 
U. S. Geol. Survey, 1894. 
Contains a detailed geological map of the Cripple Creek district and brief descriptions of the geology 
and ore deposits. 
Cross, W., and Penrose, R. A. F., jr. The geology and mining industries of the Cripple Creek district, Colo¬ 
rado. Sixteenth Ann. Rept. U. S. Geol. Survey, pt. 2, 1895, pp. 1-209. 
The best and most complete account of the geology and ore deposits of Cripple Creek. 
Curle, J. H. The gold mines of the world. Second edition, London, 1902, pp. 271-284. 
. Particularly valuable as a shrewd and unprejudiced review of the mines from the financial standpoint. 
Finch, John W. The circulation of underground aqueous solutions and the deposition of lode ores. Colorado 
Scientific Society, Proceedings, vol. 7, 1904, pp. 193-252. 
A paper treating of ore deposition in general, but with special application to Cripple Creek, whence 
most of the illustrations are drawn. 
Hillebrand, W. F. Calaverite from Cripple Creek, Colorado. American Journal of Science, 3d ser., vol. 50, 
1895, pp. 128-131. 
Shows by chemical analyses that specimens from the Prince Albert, Raven, and C. O. D. mines have the 
composition of calaverite. Crystallographic study by Penfield indicates that the crystals are probably 
triclinic, but are near sylvanite in angles and axial ratios. 
