SILVER. 1b 
in these regions. The vein of Guanaxuato, the most productive in 
Mexico, intersects argillaceous and chloritic shale, and porphyry ; it 
_ affords one-forth of ali the Mexican silver. The Valencian mine is 
the richest in Guanaxuato. The Pachuca, Real del Monte, and Moro 
districts, are near one another. Four great parallel veins tranverse 
these districts, through porphyry. 
In the United States the chief silver mines are in California, Ne- 
vada, Colorado, Utah, Montana, and Idaho. The principal California 
mines are in its southeastern counties bordering on Nevada, namely: 
Alpine, Mono, and Inyo; the total yield in 1874, about $1,700,000. 
Those of Nevada are the Washoe region, about Virginia City and the 
Comstock Lode; in Lander County, along Reese River Valley, eic., 
the chief town of which is Austin; Esmeralda County, southeast of 
Washoe; in Kureka County, next east of Lander ; in Lincoln County, 
the southeastern of the State ; Humboldt County to the nerth ; White 
Pine, Nye and Elko counties, east and southeast of Lander County. 
The rocks connected with the veins in Kastern California and Western 
Nevada are eruptive rocks, related for the gnost part to andesyte (in 
part, named propylite) and trachyte, with some doleryte. The mines 
of Utah, are those of the Big and Little Cottonwood distric.:s (which 
include the Emma Mine), the American Fork district, the Parley’s 
Park district in the Wahsatch Range north of Big Cottonwood, and 
the East Tintic district, in which are the Eureka Hiil mines ; those 
of Arizona, the Heintzelman, etc.; of Colorado, in the San Jucn region; 
of Northern Michigan, at the copper mines ; of Canada, at Prince’s 
Mine, Spar Island, Lake Superior. 
For the years previous to 1859 the whole yield of silver from United 
States mines is estimated at $1,000,000. The following are the amounts 
for the succeeding years, as published in Jones’s Senate Report (1877), 
those for the years 1871 to 1876, inclusive, being from estimates by 
J. J. Valentine. : 
LGLIS | Sige eee eee $100,000 ISCS 5a. ves &- ~ SHI2L000000 
SOUP Cae os sans sn. os 150,000 TSOSN Se a ccs ene. 13,000,000 
LSS: eee 2,100,600 TSU rhe. s Beate 2 17,320,000 
LC Tee Og eee aera 4,500,000 DSi oso oc. ie ean: 19,-86,060 
LOCE SS ete aes 8,500,000 1S Meroe ie eraser ee 19,924,429 
ie an Ce eee 11,000,000 Siac conse ees < See 27,483,302 
LSD Lei ease 11,250,000 of gee gs eee mR 29,699,122 
Le nee OOO OO0T C) VSP00 5 ar os ae 31,635,.389 
LLC) ee eee 18,550,000 LST Ges crete on oe vas 8 39,292,924 

The Comstock Lode contributed to the silver of the world first in 1861. 
In 1875 it yielded $14,492,350, and the rest of Nevada $6,717,636 
$21,209,986 ; and in 1876 these amounts were 20,570,078 and 7,462,752 
= $28,032,830. The $7,462,752 from the “ rest of Nevada” in 1876, 
were divided, as follows, betwéen its principal mining regions: Lan- 
der County, Austin district, $1,187,500 ; Esmeralda County, Columbus 
district, $1,624,789 ; Elko County, Cornucopia district, $460,048 ; Eu- 
reka County, $1,480,558 ; Lincoln County, Pioche or Ely district, 
$790,095 ; Nye County, Tyboe and Reveille districts, $1,450,000. 
The yield in 1876 of Utah was $8,351,520; of Coiorado, 3,000,000 ; 
of California, 1,800,000 ; of Arizona, 500,000; of Montana, 800,000; 
of Idaho, 300,000 ; of New Mexico, 400,000. 
