SILVER AND GOLD. 207 



sistent, being worked in one case for 4000 feet. The flatter fissures 

 are less rich. The principal ore bodies, however, occur as hori- 

 zontal enlargements of both these sets of veins. Just over the 

 thin bed of limestone mentioned above the ores have spread out 

 into sheets from 20 to 40 feet wide and from a few inches to three 

 feet thick. They consist of solid masses of the common sulphides, 

 galena, pyrite, gray copper, etc., and are very rich. Above them 

 the fissures apparently cease, or at least are tight. Two hundred 

 feet down from them the vein filling becomes nearly barren, glassy 

 quartz. These are most remarkable ore bodies, and would appear 

 to have been formed by uprising solutions, which met the tight place 

 and spread sidewise, depositing their minerals; but as Mr. Farish 

 advances no explanation, it is hardly justifiable for others, less 

 familiar than himself with the phenomena, to do so. 



The lead-silver ores of Red Mountain and Rico have already 

 been mentioned (2.08.17). Silverton and Ouray are the principal 

 towns of the San Juan. 1 



2.09.11. The new mining region of Creede, now decided to be 

 in Saguache County, should be mentioned in this connection. It 



1 T. B. Comstock, "The Geology and Vein Structure of Southwestern 

 Colorado," M. E., Vol. XV., 218 ; also XI. 165, and Engineering and Min- 

 ing Journal, numerous papers in 1885. "Hot Spring Formation in the 

 Red Mountain District, Colorado," M. E., XVII. 281. Rec. S. F. Em- 

 mons, "On the San Juan District," Engineering and Mining Journal, 

 June 9, 1883, p. 332. " Structural Relations of Ore Deposits," M. E., XVI. 

 804. Rec. Tenth Census, Vol. XIII., p. 60. F. M. Endlich, "Origin of 

 the Gold Deposits near Ouray," Engineering and Mining Journal, Oct. 19 r 

 1889. "San Juan District," Hayden's Survey, 1874, p. 2^9. Ibid., 1875,. 

 Bull. III.; Amer. Jour. Sci., iii., X. 58. J. B. Farish, "On the Ore De- 

 posits of Newman Hill, near Rico, Colo.," Colo. Sci. Soc., April 4, 1892.. 

 Rec. R. C. Hills, Proc. Colo. Sci. Soc., 1883. Rec. W. H. Holmes, " La 

 Plata District," Haydens Survey, 1875; Amer. Jour. Sci., iii., XIV. 420. 

 M. C. Ihlseng, " Review of the Mining Interests of the San Juan Region,'" 

 Rep. Colo. State School of Mines, 1885, p. 27. G. E. Kedzie, " The Bedded 

 Ore Deposits of Red Mountain Mining District, Ouray County, Colorado,''' 

 M. E., XV. 570. Rec. G. A. Koenig and M. Stocker, " Lustrous Coal and 

 Native Silver in a Vein in Porphyry, Ouray County, Colorado," M. E., 

 IX. 650. T. E. Schwartz, "The Ore Deposits of Red Mountain, Ouray 

 County, Colorado," M. E., 1889. J. J. Stevenson, "On. the San Juan," 

 Wheeler's Survey, III., p. 376. " The San Juan Region," Engineering and 

 Mining Journal, Aug. 27, 1881, p. 136 ; Sept. 24, 1881, p. 201 ; July 17, 

 1880 ; Dec. 20, 1879 ; and many other references in 1879 and 1880. P. H. 

 Van Diest, "On the San Juan District," Proc. Colo. Sci., January, 1886. 



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