SILVEE MINING IN COLOEADO. 615 



battery of stamps to be crushed finer. Thence the stuff issues through 

 screens that have 18 meshes to the hueal inch; passes again to another jig- 

 ging machine, having a finer sieve than those before employed ; the opera- 

 tion being repeated as before, a portion of dressed ore is obtained, the refuse 

 again elevated to the final crushing, where it passes through a screen of 24 

 meshes, and once more to a still finer sieve, where a third portion of dressed 

 ore is obtained and from which the tailings flow to settling tanks, or other 

 contrivances, which efiect a sizing or classification of the material according 

 to its degree of fineness, when it is treated further on shme-tables or in bud- 

 dies. The capacity of the works is about 50 tons of crude ore per day. 

 They are very well constructed, under the direction of Mr. Julius Kurtz, and 

 are provided with every facility for the prosecution of the work proposed. The 

 addition of other appliances, for the treatment of the dressed products, either 

 by amalgamation or other methods, is contemplated. These works had not 

 entered upon regular operations at the time of the writer's visit, and no defi- 

 nite information has been received concerning their subsequent performance. 

 The following advertised schedule of prices, offered by the company, indi- 

 cates the advantage which producers of low-grade ores were expecting to 

 derive from the successful working of this establishment : 



For galena ores assaying SlOO per ton, the company pays $70 00 



For galena ores assaying $90 per ton, the company pays 60 00 



For galena ores assaying $80 per ton, the company pays 50 00 



For galena ores assaying $70 per ton, the company pays 40 00 



For galena ores assaying $60 per ton, the company pays 30 00 



For galena ores assaying $50 per ton, the company pays 22 50 



For galena ores assaying $45 per ton, the company pays — 15 00 



For those ores in which zincblende predominates — 



Assaying $100 per ton, the company pays $60 00 



Assaying $90 per ton, the company pays 50 00 



Assaying $80 per ton, the company pays 40 00 



Assaying $70 per ton, the company pays 30 00 



Assaying $60 per ton, the company pays 20 00 



Assaying ^50 per ton, the company pays 15 00 



Assaying $40 per ton, the company pays 10 00 



