SILVER AND GOLD, CONTINUED. 231 



Ite still retained a limestone cap. The ore-bearing solutions, on 

 reaching a shaly streak containing a limestone layer, departed 

 from the fissure and followed under the limestone, so as to form a 

 lateral enlargement, much like those described and figured from 

 Newman Hill, Colorado, under 2.09.10. The Pahranagat and Tern 

 Pahute districts, still farther south, have had some prominence, 

 but the whole region is so far from the lines of transportation that 

 the conditions are hard ones. 1 



2.11.14. Ney County, next west, has an important mining 

 center, in its northern portion, around the town of Belmont. 

 Quartzite and slates rest on granites in the order named, and in 

 them are veins with quartz gangue and silver chlorides, affording 

 very rich ores. Southeast of Belmont is Tybo. 2 



2.11.15. White Pine County lies to the northeast, and contains 

 the White Pine district. The principal town is Hamilton, about 

 110 miles south of Elko, on the Central Pacific. The Humboldt 

 range is prolonged southward in some broken hills, consisting 

 chiefly of folded Devonian limestone. At Hamilton these are 

 bent into a prominent anticline, and this has a strong fissure cross- 

 ing the axis. The geological section is Devonian limestone, thin 

 calcareous shale, thin siliceous limestone, argillaceous shale, prob- 

 ably Carboniferous sandstone, and Carboniferous limestone. The 

 ore bodies occur, according to Arnold Hague, in four forms, all in 

 the Devonian limestone: (l) in fissures crossing the anticlinal axis; 

 (2) in contact deposits between the limestones and shales; (3) in beds 

 or chambers in the limestone parallel to the stratification; (4) in ir- 

 regular vertical and oblique seams across the bedding. The ore is 

 chiefly chloride of silver in quartz gangue. It is thought by Mr. 

 Hague to have probably come up through the main cross fissure, 

 and, meeting the impervious shale, to have spread through the 

 limestone in this way. 3 



Egan Cafion is in the northern part of the county and shows a 

 geological section of granite, quartzite, and slate in the order 

 named. In slates, and perhaps extending into the quartzite, is a 

 quartz vein five to eight feet wide carrying gold and silver ores. 



1 E. P. Howell, Wheelers Survey, III. 257. G. M. Wheeler, Report, 

 Wheelers Survey, 1869, p. 14. 



2 S. F. Emmons, Survey of the Fortieth Parallel, Vol. III., p. 393. G. 

 K. Gilbert, "On Belmont and Neighborhood," Wheeler's Survey, III. 36. 



8 J. E. Clayton, "Section of the Rocks at Hamilton, Nev.," Col. 

 Acad. Sci. A. Hague, Fortieth Parallel Survey, Vol. III., p. 409. 



