GOLD MINING IN COLORADO, 



535 



Month. 



April 

 May . 

 June . 

 July . 

 August 



Fathoms 

 sloped. 



6i 



53 



Tons of ore mined. 



1st class. 



15 

 6 



12 



2d class. 



366 

 430 

 586 



594 

 416 



13 



a 

 o 

 H 



180 

 296 



379 

 455 



bo 



■ c 



'S 

 E 



o 



J12 06 

 16 80 



12 10 

 II 42 



13 79 



bo 



c 



o 



$4 62 

 4 26 



2 85 



3 65 



Oh 



O 



H 



$21 42 



16 36 

 14 27 



17 44 



The fluctuation in the cost of both mining and milling is due to a variety 

 of circumstances, such as the variable amount expended on ordinary repairs in 

 any given month, and the quantity of rock produced or milled during that 

 month. 



Thus, in the months of July and August, the costs of milling were less 

 than in the foregoing, because the expenditures for repairs were not so great 

 during those months while the capacity was enlarged by increasing the speed 

 of the stamps and the number of days of running, thus diminishing somewhat 

 the costs per ton. 



The first-class ore, sold at the Smelting Works, netted the mine, in the 

 month of May, $93; in July, $98; and in August, $104 per ton, in currency. 

 The yield of the stamp-rock, including that treated in the company's mill and 

 in custom mills, was, in May, $24 50; in June, $15; in July, $12; and in Au- 

 gust, $19 per ton, in currency. The total receipts from ores and sale of tail- 

 ings, and expenditures of all sorts, during the four months referred to, were 

 as follows: 



Month. 



May 



June 



July 



August 



Total for four months 



Receipts. 



$x6, 491 



8,766 



8,310 



12, 000 



45, 567 



Expenditures. 



gii, 731 12 



10, 306 48 



9. 883 36 



8, 798 62 



40, 719 58 



