MINING. 325 



000; Hueston Hill $1,000,000; Osborne Hill $1.000,000; 

 Lone Jack $500,000 ; Gold Tunnel $1,000,000 ; Nevada $400,- 

 000 ; Sneath & Clay $300,000 ; Lecompton $250,000 ; Wig- 

 ham $200,000 ; the Banner $200,000 ; and the Idaho several 

 millions, now yielding $4,000 daily. 



In Sierra County, the Sierra Buttes mine has paid more 

 regularly than any other fn the State, having been worked 

 steadily for more than twenty years, and having yielded about 

 $2,500,000, including more than $1,000,000 profit. The In- 

 dependence, on the same vein, yielded 100,000 in 1866. The 

 Primrose, two miles distant, has yielded $226,000 idle. The 

 Union, one mile from Alleghany, yielded $75,000 in a pocket. 



In Plumas County, the Eureka has yielded $1,600,000 ; the 

 Mammoth, $1,000,000; the Crescent, $500,000; and the 

 Whitney, $68,000. 



In Yuba County, at Brown's Valley, twelve miles from 

 Marysville, and not more than 500 feet above the level of the 

 sea, are the Pennsylvania, which yielded at one time $10,000 

 net per month ; the Jefferson, which has paid $250,000 of 

 dividends ; and the Dannebroge, which has yielded $250,000. 



247. Extraction. The extraction of auriferous quarts 

 after it has been found, does not differ in any important ma- 

 terial from the extraction of other ores in narrow veins. The 

 rules for running tunnels and drifts for stoping, draining, ven- 

 tilating, and timbering, are precisely the same. Extraction, 

 however, requires much experience and' judgment for proper 

 management. The dip, thickness, and material of the vein, 

 the horizontal length and the dip of the pay-chute, the char- 

 acter of the walls, the supply of water, and the situation of 

 the mill, must be taken into consideration. Access must be 

 had to the lower works by a horizontal tunnel, or vertical 

 shaft, or an incline running down on the dip of the lode. 

 There are, however, very few auriferous quartz mines in which 

 the lower works can be reached profitably by a tunnel. 

 Ordinarily an incline is preferred ; it goes down in the vein- 



