EUDLICH.] 



GEOLOGY STTTISAICS OF MONTE CEISTO MINE. 



293 



Jessee usually gives the owner a certain percentage either of brutto or 

 netto. In leasing the Gregory extension, which may be regard ed as a 

 typical lease, the following conditions were agreed to : Briggs furnishes 

 the steam or horse power ; the lessees, the brakeman. One-quarter of 

 the cost of crushing is paid by Briggs, unless they crnsh any mill but 

 his own. In the latter case they pay the entire co§t. Briggs supplies 

 •drills, shovels, hammers, &c. ; they replace hammer-handles, &c. On ores 

 up to t) ounces per cord, they pay Briggs 25 i)er cent. ; over G ounces 

 they pay from -40 to 50 per cent. Of the smelting-ore of $100 per ton, 

 they pay 25 per cent. 5 over $100 per ton, they pay 50 per cent. On a 

 six months' lease they must sink 30 feet. Briggs has the right to retain 30 

 per cent, of the proiits as a guarantee that this shall be done. Briggs fur- 

 nishes the timber, and the lessees are required to timber the mine and 

 keep it in good order. A foreman usually receives but low wages, but 

 lias a small percentage of the net profits, however. 



Subjoined is the statement of Mr. Mills, the data of which are taken 

 from the Monte Oristo mine : 



Monte Cristo Mine, on Quartz Hill, Nevada, mining-district, owned and worked iy James 

 Mills, Central City, Colo. — Statement for one year , 1672, having two miners at tvork, engaged 

 per aay. 



EXPENSES. RECEIPTS. 



25^ cords, or 204 tons, of mill-ore, 



and 14 /Lfu7, tons smelting-ore.. $67 67 



Wages for miners 2, 040 00 



Hauling 175 50 



Milling ! 704 50 



2, 969 67 



Yield of 25| cords, or 204 tons, 

 mill-ore $3,132 66 



Held of 142^0^0^ tons smelting- 

 ore 1,1.58 17 



4,290 83 

 2, 969 67 



Balance 1,32116 



Milling-ore : 

 Yield of 25i cords ® ^122.88 per cord, (204 tons ® $15.36 per ton) $3,132 66 



Smelting-ore : 

 Yield of 14 ^y^o tons ©881.05 per ton " 1,158 17 



Total 4,290 83 



GROSS COST. 



Rnuning mine-expenses, wages, hauling, and milling: Milling-ore, 25 J cords, $110-60 

 IJer cord ore ; 204 tons milling-ore, $13.82i per ton. 



Average assay of smelting-ore, (returns from Boston Colorado Smelting Company :) 

 14i\)'ifTj tons ore : gold, 2t ounces per ton ; silver, ,5f ounces i>er ton. 



PROFIT. 



Milling-ore : 25-;V cords, $12.20 per cord ; or, 204 tons, $1.52| per ton. 

 Smelting-ore: 14^"ij'n tons, $70.67| per ton. 

 Profit on total expense of $2,969.67, $1,321.16, or 44|- ]3er cent. 



Improvements overground as well as underground were made during the time, and 

 the mine kept in good condition. 



PART II. 



Differing from the lodes of the Gilpin County mining-district are 

 those located near Georgetown, in Boulder County, the most extensive 

 silver-mining district working at present in Colorado. 



Traveling upward along South Clear Creek in a westerly direction, the 

 canon, which has been narrow for some distance, suddenly begins to open 

 out into a wide, fertile valley of triangular shape, bordered on every 

 side by steep mountains rising abruptly from it. In this valley, in its 

 upper, broadest portion, the mining city Georgetown is located, almost 



