14 



reported it to be fifty per cent, lead and to give thirty o^^^''^^ 

 silver to the ton. At the request of Mr. Theodore Balbacn, 

 who now has charge of the Swansea Smelting W orKS, at 

 Denver, Colorado, I sent him some of this ore, and also 

 from other localities in Presidio county. In reply, he 

 states that they all indicate that mining will be prohtable 

 in that portion of Texas. 



Mr. Anderson, one of the proprietors of the bpencer 

 mine, was with us in that region. His company _ own 64O 

 acres, a section which includes the Spencer mine. His 

 company had begun to erect works in Presidio for smelt- 

 ing ores. 



Mr. Anderson gave me the following analysis of ores 

 from different localities on the property of the company,, 

 made by Chauvenet and Blair, well known analytical 

 chemists of St. Louis, Missouri : 



PER TON. 



No. 1. 13 oz. Coin value 816 80 



No. 7. 15 oz. Coin value 19 30 



No. 8. 59 oz. Coin value 76 28 



No. 9. 20 oz. Coin value 25 85 



All susceptible of much concentration, by which process 

 they would yield a larger per cent, of silver. No bismuth 

 or antimony in the ores. No account given of the lead, it 

 being of little value in Presidio county. 



Mr. Anderson, at another time, sent ores to the same 

 chemists, who gave the following report : 



PER TON. 



No. 1. Silver $144 80 



No. 1. Lead 34 25 



This is a valuable ore, which can be made to yield a 

 much larger per cent, of silver by lately improved methods 

 of smelting. 



A specimen of copper ore from a place about a mile from 

 the Spencer mine, according to Chauvenet and Blair, has — 



Siliceous matter 49.07 



Peroxide of iron 14. 65 



Metalic copper 19.48 



Silver, $2 58 per ton. 



This is the carbonate of copper, an easy form for smelt- 

 ing. 



To examine sufficient to make a good report upon the 

 rocks and minerals of the southern portion of Presidio 



