est working yield of all the smelting operations—the average 
inp above this. Don Jesus Mateos, one of the 
José, obtains never less than 6 oz. to the carga, generally as high 
as 8 oz., and sometimes 9 and even 10 oz. 
Cost of ore.—The cost of ore delivered at the mouth of the 
mine varies according to the expense of raising. At the Par- 
cionera, which may be taken as the type of horizontal or wien: 
workings, this cost, which includes all mining expenses, is sta 
at $1.50 per carga. At the Santo Domingo, the cost is greater 
on account of the laborious raising. The ores are delivered at 
the furnace for 20 to 374 cents per carga, the donkey-load being 
one carga (300 lbs. : 
Reduction.—The furnace employed in the district is the com- 
mon Mexican adobe horno, a blast-furnace 47 inches high, 18 in 
oa m8 of argentiferous lead per week. 
uel.—The question of fuel is one of paramount os 
: aa 
to the industry of the district. The mesquite root is t 
In th 
n the neigh 
exha by the draft upo 
