406 MINING IKDUSTET. 



The ores are ricli in silver sulphurets, but combined with zinc, lead, and 

 other base metals, involving the necessity of expensive metallurgical pro- 

 cesses. The mine has been opened by a shaft, from which three successive 

 levels have been driven. 



The Mount Tenabo Company own a mill situated on Mill Creek, on the 

 north side of the mountain. It is provided with 12 stamps, 4 roasting fur- 

 naces, 4 Wheeler and 2 Varney Pans, and 2 settlers. The reduction pro- 

 cess is the same as that employed at Austin. The ore yields about 87 per 

 cent, of its assay value. The mine of this company produced about 2,000 

 tons of ore during the three years of 1865, ^66, and '67. The average yield 

 of 850 tons during the last-named years was $67 per ton. 



In 1868 work was suspended on this mine and the district almost en- 

 tirely deserted. There are, however, several other important mines, some of 

 which have been persistently worked. Among them the St. Louis is the 

 most prominent. This vein is also in the quartzite. It produces some very 

 rich ore, which was formerly sent to Austin for reduction, but is now worked 

 in the mill just referred to, which has been leased or purchased from the 

 Mount Tenabo Company. 



The Grarrison mine, opened in 1868, is also an enterprise of considera- 

 ble promise. This vein is in the limestone, below the quartzite belt. A quan- 

 tity of its ore, about 50 tons, yielded $250 per ton, when worked at the Man- 

 hattan mill in Austin. 



Conflicting interests, mismanagement in some cases, want of capital in 

 others, and the great costs of working in former years, have greatly retarded 

 the development of this district. It is now growing in importance. It is 

 quite easily accessible from the railroad, and is well supplied with wood and 

 water. 



According to the quarterly returns of the county assessor the St. Louis 

 mine produced, during the year 1868, 88 tons of ore that yielded an average 

 of $600, currency, per ton. 



The assessor's return from the district, for the quarter ending December 

 31, 1869, is as follows: 



