CENTEAL AND EASTERN NEVADA. 305 



March 12, twelve hours later, value, per ton, of contents of bath $248 G8 



12 do do do 253 GO 



13 do do do 263 30 



13 do do do 273 12 



U do do do 279 94 



14 do do , do 282 7G 



15 do do do 287 58 



15 do do do 292 5G 



16 do do do 297 22 



16 do do do 302 31 



17 do do do 311 68 



17 do do do 321 82 



18 do do do 336 44 



18 do do do 346 40 



19 do do do 346 40 



19 do do do 351 08 



20 do do do 355 96 



20 do do do 365 70 



21 do do do 375 20 



21 do do do 378 40 



22 do .do do 385 22 



Total quantity of crude metal charged 20.8 tons. Value 4,584 89 



Total quantity of reflned metal tapped 11.9 tons. Value 4,541 12 



Loss by subMmation. and skimmings, 42.78 per cent, of total weight of crude 



metal. 



Loss in sUver 0.97 per cent, of total value of silver contained in the metal. 



The calcining furnace in which the foregoing run w^as made was 10 feet 

 long by 5 feet wide. The capacity of those subsequently introduced, and 

 such as have been described in these pages, is said to be equal to the treat- 

 ment of two tons of crude metal per day, yielding at the rate of about one 

 ton of rich lead for twenty-foui" hours. There are four of these furnaces at 

 the works. The pans were cast in San Francisco and brought over to 

 Nevada at a large cost for freight. Much trouble was at first experienced 

 owing to leaks in the pans, by defective casting, involving great expense and 

 loss of time in taking them out for repairs, but they were ultimately brought 

 into a very efficient condition. The cost of calcination is stated at $8 per ton 



of ore. 



39 



