SILVER AND GOLD, CONTINUED. 219 



2.10.05. Montana took the lead of all the States in 1887 in 

 the production of silver, was second in gold, and first in the total 

 production of the two. It is now second. In its mineral wealth 

 it yields to no other State in the Union. The mining districts are 

 mostly in the western central and western portions. Develop- 

 ments have progressed so rapidly that all the desirable data are 

 not available. 



2.10.06. Madison County. Veins in gneiss containing galena 

 and pyrite in a quartz gangue. Virginia City is the principal 

 town, and the veins are north of it in the northern part of the 

 county. 1 



2.10.07. Beaverhead County. Near Bannack City quartz veins 

 with auriferous pyrite on the contact between the limestone and 

 so-called granite. At Glendale, in the northern part of the 

 county, are the Hecla mines, referred to under " Lead-silver " 

 (Example 32). Auriferous quartz veins are reported farther 

 north. 2 



2.10.08. Jefferson County. This county contains ore bodies 

 chiefly auriferous quartz, in gneiss, porphyry, or limestone. The 



Rep., 1871-72. W. S. Keyes, in Brown's first report on mineral resources, 

 etc., last part, Amer. Jour. Sci., II. 46, 431. Rec. W. Lindgren, "Eruptive 

 Rocks," Tenth Census, Vol. XV., p. 719, forming Appendix B of Davis's 

 first paper. See also Proc. Cal.Ac.ad Sci., Second Series, Vol. III., p. 39. J. 

 S. Newberry, "Notes on the Surface Geology of the Country bordering on 

 the Northern Pacific Railroad," Annals N. Y. Acad. Sci., Vol. III. 242; 

 Amer. Jour. Sci., iii., XXX. 337. " The Great Falls Coal Fields," in Geol. 

 Notes, School of Mines Quarterly, VIII. 327. F. Rutley, "Microscopic 

 Character of the Vitreous Rocks of Montana," Quar. Jour. Geol. Sci., 

 XXXVII. 391. See Eccles, above. W. H. Weed, "The Cinnabar and 

 Bozeman Coal Fields of Montana," Bull. Geol. Soc. Amer., II. 349-364. 

 Engineering and Mining Journal, May 14 and 21, 1892. "Montana Coal 

 Fields," Bull. Geol. Soc. Amer., III. 301-330. C. A. White, "Existence of 

 a Deposit in Northwestern Montana and Northeastern Dakota that is Pos- 

 sibly Equivalent with the Green River Group," Amer. Jour. Sci., iii., 

 XXV. 411. R. P. Whitfield, "List of Fossils from Central Montana," 

 Tenth Census, Vol. XV., p. 712 ; Appendix A to Davis's paper. J. E. 

 Wolff, " Notes on the Petrography of the Crazy Mountains," etc., North- 

 ern Trans. Survey. " Geology of the Crazy Mountains," Bull. Geol. Soc. 

 Amer., III. 445. H. Wood, "Flathead Coal Basin," Engineering and 

 Mining Journal, July 16, 1892, p. 57. H. R. Wood, "Mineral Zones in 

 Montana," Engineering and Mining Journal, Sept. 24, 1892, p. 292. 



1 S. F. Emmons, Tenth Census, Vol. XIII., p. 97. 



2 Ibid. 



