SILVER AND GOLD, CONTINUED. 225 



2.11.02. The greater number of the Utah mines are for lead- 

 silver ores and have been mentioned under " Lead Silver." The 

 northwestern county, Box Elder, is in the alkaline desert region 

 of the Great Basin. The mining districts occur in the central 

 part of the State, in the Wasatch and Oquirrh mountains, and are 

 also found in the extreme southwest. 



2.11.03. Ontario Mine. Nearly east of Salt Lake City, in 

 Summit County, is the Ontario mine, a vein from four to twenty- 

 three feet wide (averaging eight feet), in quartzite, but extremely 

 persistent, being opened continuously for 6000 feet. In the lower 

 working a porphyry dike has come in as one of the walls. It is 

 extensively altered by fumarole action to clay. The best parts of 

 the mine have quartzite walls. The ores consist of galena, gray 

 copper, silver glance, blende, etc. Other somewhat similar ore 

 bodies are known in the same region but are less developed. 1 



2.11.04. The lead-silver veins of Bingham Canon, in Salt 

 Lake County, have already been mentioned. Reference may 

 again be made to the great bed-veins of gold quartz associated 

 with them. Ophir Canon and Dry Canon, in Tooele County, 

 and the Tintic district, in Juab County, have also been described. 

 In addition to the smelting ores, others have been treated by 

 milling. Quite recently interest has been directed to the mines 

 of the Deep Creek district, on the extreme western border of 

 Utah, in the Ibapah range. Limestones regarded by Blake as 

 Carboniferous, and other sedimentary rocks, have been broken 

 through by great outflows of granite, andesite, hypersthene-ande- 

 site, etc. The ore bodies appear to be contact deposits in lime- 

 stone near igneous rocks, and carry much free gold. 2 



In Beaver County the interesting deposits of the Horn Silver, 

 the Carbonate, and the Cave ore bodies have been mentioned 



Sci., iii., III. 195. Wheeler, Gilbert, Lockwood and others on Western 

 Utah, Wheeler's Survey, Rep. Prog. 1869-71-72. Idem, Final Reports, 

 Vol. III. 



1 T. J. Almy, "History of the Ontario Mine, Park City, Utah," 

 M. E., XVI. 35. " The Ontario Mine," Engineering and Mining Journal, 

 May 28, 1881, p. 365. D. B. Huntley, Tenth Census, Vol. XIII., p. 438. 



2 W. P. Blake, " A<re of the Limestone Strata at Deep Creek, Utah, 

 and the Occurrence of Gold," etc., Amer. Geol, January, 1892, p. 47. Engi- 

 neering and Mining Journal, Feb. 23, 1892, p. 253. S. F. Emmons, For- 

 tieth Parallel Survey, Vol. II. J. F. Kemp, " Petrographical Notes on a 

 Suite of Rocks collected by E. E. Olcott," N. Y. Acad. Sci., May, 1892. 



