402 MINING INDUSTEY. 



concerning the capacity and working of the mill are given here. It has 40 

 stamps, of about 800 pounds weight, dropping about 9 inches, 70 times per 

 minute. A portion of the stamps are for dry and a part for wet-crushing. 

 In June, 1868, 20 stamps were employed on each. For dry-crushing, screens 

 of wire-cloth, having 40 meshes to the inch, were used. The capacity of the 

 stamps for dry-crushing is about one ton per head, per day; for wet-crushing, 

 one and a half to two tons. 



For roasting the dry-crushed ore there are ten furnaces, generally simi- 

 lar in construction to those of the Manhattan or Dall's miU, already described. 

 Each furnace works a charge of 1,000 pounds in six or seven hours. Salt of 

 the best quality is furnished here from Silver Peak, costing about $65 per 

 ton. There are 32 pans; 16 for the treatment of roasted ores, and 16 for raw 

 ores, besides settlers for the separation of the amalgam from the pulp. In 

 addition to the above the mill is furnished with retorts, melting and assaying 

 departments, complete in all their appointments. 



The machinery is driven by two engines ; one for the pans, the other for 

 the stamps. The first is a Corliss, 18 inches diameter of cylinder by 38 inches 

 stroke; the other, an ordinary engine, 15 inches diameter, 30 inches 

 stroke. Steam is supplied from four boilers, built in sets of two each, but 

 connected. When the mill is employed to its fuU capacity all the boilers are 

 required, burning twelve cords of wood per day. The cost of wood is from 

 $4 to $5 per cord. 



The costs of milling by the wet process are estimated at about $10; but 

 the statements furnished are not sufficiently detailed to show the costs of 

 either method by itself, the running expenses of the whole work being kept 

 without close analysis. 



The product of the mill, from the time of its commencing operations to 

 the middle of June, 1868, is shown by the following statement, furnished by 

 Mr. Bright, the financial agent of the company : 



In February, 1868 $27,697 01 



In March, nearly all dry-crushing . 43, 798 04 



In April— 16 days only— all dry-crushing 18, 750 22 



