GOLD MINING IN COLORADO. 587 



gold into ingots. The present capacity of the works is about three tons per 

 day. For a full description of the chlorination process, the reader is referred 

 to Guido Kiistel's "Concentration and Chlorination." 



The California Reduction Works, another establishment designed for the 

 working of high-grade ores, especially those rich in silver, are situated near 

 Black Hawk. They have not been in constant or regular operation during the 

 past year or two. The process employed is that of chloridizing roasting, per- 

 formed in a Bruckner cylinder, and subsequent amalgamation in barrels. 

 This is essentially the same as that which is in use at Georgetown, and noticed 

 with more detail in the next chapter. 



Peoduction of Gilpin County. — The total value of the bullion produced 

 in Gilpin County during the past two years may be very nearly ascertained 

 by adding to the aggregate shipments of the three banks of Central City the 

 value of the matt shipped from the Boston and Colorado Smelting Works. 

 Nearly all the bullion produced in the county is shipped in one or the other of 

 these two forms; the crude bullion, obtained in the stamping- mills, being 

 either sold to the bankers or shipped through them ; while the value of the 

 first-class ore is represented in the matt. The amount that leaves this part of 

 the country in private hands, or by other means than those just indicated, is 

 thought to be insignificant by those who are very competent to judge. 



A record of the bank shipments, during the period referred to, has been 

 very carefully kept by Mr. Frank C. Young, cashier in the banking-house of 

 Warren Hussey & Co. The following is Mr. Young's statement, showing the 

 coin value of the aggregate shipments of the three banks at Central City 

 during the years 1868 and 1869 : 



