486 KANSAS CITY REVIEW OF SCIENCE. 



The Cummings lode, says the Aspen Sun, has just had a mill-run, at Argo, 

 of 48 pounds of ore, which returned 220 ounces of silver and 12 ounces of gold 

 to the ton, netting $49- 5 * fo^" the 48 pounds of ore. 



A mill for the treatment of low grade refractory silver ores is about complet- 

 ed at Pitkin by the Michigan & Colorado Mining Company, of that place, and 

 will be ready to start shortly. 



Brittle Silver. — Active work has again begun at the mine. 



Streb Consolidated. — The Carbonate Chro?iicle says that this Company has 

 completed the assessment work on all its properties on French Mountain, and 

 developed some of the claims quite extensively. The J. J. Streb, Colorow, and 

 Silver Spur are all said to show strong ore-bodies ranging in value from 44 to 432 

 ounces of silver per ton. The vein was struck near the surface, and in doing 

 assessment work widened from one inch to a foot. Parties are figuring for a 

 lease of some of this Company's mines, and propose to work them with a large 

 force through the winter. 



SAN JUAN COUNTY. 



The Comstock Sampling-Works have been crowded ever since they began 

 running, and we learn enough ore has been contracted for to keep them — in con- 

 nection with the North Star ore — busy running pretty nearly all winter. A build- 

 ing for a concentrator which will be in running order early next spring is now 



going up. 



Red Mountain. — The excitement over the discoveries of rich mineral on 

 Red Mountain, says the San Juan Herald, increases. Notwithstanding the re- 

 cent unusually inclement weath'er, the country in that vicinity is literally covered 

 with prospectors. — Engineering and Mining Journal 



THE EXTRACTION OF THE PRECIOUS METALS FROM ORES BY 

 ELECTROLYSIS. —Concluded. 



Electrolysis of Complex Ores. — The same process is equally applicable 

 to the extraction of the metals contained in the multiple sulphurets. Such sul- 

 phurets are in reality merely combinations of single sulphides combined or mixed 

 together ; consequently the decomposition of such a multiple ore in the electroly- 

 tic bath, instead of yielding merely a single metal to the acid which is set free, 

 precipitates the precious metals which the ore. contains. 



Thus, if we place at the anode in an electrolytic trough an ore composed of 

 a multiple sulphuret and make use of a solution of lead nitrate as the electrolytic 

 liquid and let the current act moderately, it will happen that whilst the lead of 

 the electrolytic salt is precipitated at the cathode the metals of the ore placed at 

 the anode will enter into solution simultaneously just in proportion as the acid of 

 the bath is set free, and will ultimately, if easily precipitable, like lead, silver, 

 copper, etc., be thrown down together at the cathode. 



