232 KEMP'S ORE DEPOSITS. 



Eureka County is the next county west of White Pine. The 

 deposits at Eureka have already been described under " Lead-sil- 

 ver " (Example 36). 



2.11.16. Lander County lies next west of Eureka. The Toy- 

 abe range runs through it from north to south and in its southern 

 portion, in Ney County, contains the Belmont deposits. (See above, 

 2.11.14.) At Austin, which is 80 or 90 miles south of the Central 

 Pacific Railroad, now connected with it by a branch, are the mines 

 of the Reese River district, named from the principal stream near 

 by. From Mount Prometheus, which consists of biotite granite 

 or granitite, and which is pierced by a great dike of rhyolite, a 

 western granite spur runs out known as Lander Hill. The ore 

 bodies are in this hill, and are narrow fissure veins with a general 

 northwest and southeast trend, carrying rich ruby silver ores, with 

 gray copper, galena, and blende, in a quartz gangue with associated 

 rhodochrosite and calcite. They are also often faulted. At times 

 they show excellent banded structure. Antimony has recently 

 been found in this region. 1 (See under " Antimony.") 



2.11.17. Elko County lies north of White Pine and Eureka 

 counties and contains the Tuscarora mining district. The depos- 

 its are high-grade silver ores in veins, in a decomposed hornblende 

 andesite. 2 



Humbol4^County is the middle county of the northern tier, 

 and _OJ3-fcaiira~sr number of mining districts, which produce botli sil- 

 ver and gold from quartz veins in the Mesozoic slate. Small 

 amounts of the precious metals come also from Washoe County, in 

 the northwest corner of the State. 3 



Churchill County adjoins Lander on the west and possesses a 

 few silver mines. 



Esmeralda County, in the southwest, has a considerable num- 

 ber of rich silver and gold mines, which produce high-grade ores 

 from veins, with a quartz gangue in metamorphic rocks, slates, 

 schists, etc. (See also under " Nickel.") 



2.11.18. Storey and Lyon are two small counties in the west- 

 ern central portion of the State, but the former contains the most 

 important and interesting ore deposit in Nevada, if indeed it is not 

 the largest and richest single vein yet discovered. 



1 S. F. Emmons, Fortieth Parallel Survey, Vol. III., p. 349. 



2 G. F. Becker, Tenth Census, Vol. XIII., p. 84. 



3 Ibid., p. 33. 



