1873-] 



Colorado Gold Mines. 



23 



employed can afford only a very vague determination of their 

 contents. The scale of prices paid is about as follows : — 



Ounces of Fine Gold Percentage Paid of the Value 

 per Ton of 2000 lbs. of the Gold and Copper. 

 10 60 



58 



55 



52<r 

 50 



45 

 40 



30 

 20 



The silver in the gold ores is not generally allowed for, 

 noris anything paid for the copper, unless in special cases.* 



Professor Hill's were not the first smelting works 

 attempted in this district ; and others have failed since 

 the establishment of his, though not in every case through 

 defects in the method. Mr. Wm. West erected, two years 

 ago, smelting and sulphuric acid works, with a view of re- 

 moving the zinc as sulphate by Gremm's method before 

 smelting the ores ; but the concern failed through lack of 

 capital before getting fairly under weigh/ At present Mr. 

 West is superintending works at Golden City, about half 

 way between Denver and Central City. The works are 

 located there in order to be near the lignite, which occurs 

 in thick beds along the base of the mountains, and which 

 is delivered at the works for 4*50 dols. per ton ; and 

 also because Golden City is central to the lead ores of 



* It may not be uninteresting to compare the above tariff with the price paid 

 for gold ores, to be similarly treated, at the smelting works on the Copiopo, 

 in Chili. 



Ounces of fine Gold per cajon 





Price paid 



= 64 Spanish 



quintals. 







per ounce. 



4 ozs. per cajon, or 1 oz. 



120 grs. 



per 



ton of 2000 lbs. . . 



. . 6-50 dols. 



5 ». » ' 1 ., 



270 





II »1 



•• 775 



ii 



6 „ „ 1 „ 



420 





II ,, . . 



. . 8-90 



11 



8 ,, ,, 2 ozs 



240 





II II 



. . 9-80 



ii 



10 „ „ 3 „ 



60 





II 11 • • 



. . 10*40 



ii 



12 „ „ 3 » 



360 





11 •! • • 



. . io - 8o 



11 



14 » 11 4 11 



180 





II II • • 



. . II*20 



11 



16 „ „ 5 » 



— 





II II • • 



. . 1170 



11 



18 „ „ 5 ., 



300 





II 11 • • 



. . 1230 



ii 



20 „ „ 6 „ 



120 





11 1} • • 



. . 12-90 



ii 



The same works pay for si 



lver ores 



wi- 



en they contain 6 marks to the 



cajon, 



or 6060 dols. of silver to the 



64 Span 



sh 



quintals — 







For 6-mark ore i - oo dol. 



per mark, 



or i-ioth of the value 



of the sil 



ver. 



,, 10-mark ore 3*00 dols. , 



, 



3-ioths ,, 



,, 





,, 40-mark ore 6-oo ,, 



, 



, 



6-ioths ,, 



11 





,, 100-mark ore 7*25 ,, 



1 





3-4ths ,, 



,) 





