432 MINING INDFSTEY. 



211-^6_3j_ ^Qjjg of ore obtained from this mine during the quarter ending Sep- 

 tember 30, 1868, which yielded $1,140 60 per ton, currency, or over $800 

 per ton, in coin. Since operations have been carried on more extensively the 

 average yield of large quantities of ore has been between $50 and $60 per 

 ton. In the last quarter of 1869 the original Hidden Treasure produced, ac- 

 cording to the assessor's returns, 965J tons, yielding $51 78 per ton. The 

 extensions, or adjoining claims, on this ledge have also been somewhat devel- 

 oped, producing some rich ore, and sharing the reputation of the original 

 location. 



Sufficient has been already said to indicate the main features of the ore- 

 deposits on Treasure Hill, and to show the different forms in which they occur. 

 It will be needless to enumerate here all the other claims or mining proper- 

 ties whose operations have made them locally celebrated. Some of them are 

 important and extensive, contributing largely to the bullion production of the 

 country. Such is the Treasure Hill Mining and Milling Company, working 

 the Summit and Nevada and the Iceberg claims, located near the Aurora de- 

 posits and on the Flats, and possessing characteristics similar to those de- 

 scribed already. The company just named, during the last quarter of 1869, 

 produced from the three claims 2,445 tons of ore, yielding $43 per ton. 



Many of the claims in Mahogany Canon were being worked in Septem- 

 ber, 1869, and promised to be of much importance. The California, on the 

 southwest slope, was also regarded as one of the important mines of the 

 region. The average cost of mining is probably fairly indicated by the state- 

 ment of the Consolidated Chloride Flat Company, given on a foregoing page. 

 According to this it amounts to nearly $15 per ton. Doubtless there are mines 

 or small claims, the conditions or circumstances of which permit the extrac- 

 tion of the ore at a much lower figure, while in others the cost will be a good 

 deal higher. In some of the months of 1869 the cost of mining in the 

 works of the company just named amounted to $20 per ton. Where the work 

 is open to the surface and so situated as to avoid much windlassing or handling 

 of the rock, the expense is diminished; but, in most cases, where opera- 

 tions have become somewhat extensive, the ore is mined in chambers or cavi- 

 ties below the surface, must be broken, assorted, and moved to the shaft or 

 pit, and raised by hand. The irregular form of the deposits prevents such 



