do some 700 feet above it, are both topogsentieally and strati- 
graphically the highest elevations in the di 
The present mine is some 500 yards further up the ravine, and, 
at an elevation above its bottom of some 120 feet, goes down in 
a bed of fossiliferous limestone some 80 feet from the top of 
the formation, the division being plainly indicated by a ledge 
of cantera above the entrance of the mine. Its depth is about 
thoroughfare, in which passage is laboriously effected partly b 
ere ~ the rock. This 
ae and gypsum. 
€ narrower portions have generally yiel 
. 
Gring rise to lateral excavations opening into the main-way. 
P 
deed it is chiefly for galena and other plunbierams ores 
(plomosos), that this mine is at present wrought; and fares eel 
that its ores of all grades (ayudas) have always been d less 
for their argentiferous qualities, than for the property of facili- 
ae the smelting of the more refactory ores (resecos) of the 
rict. 
mine; an ught i Ea ocins We ae 
ime; and though the deepest mine at present w in ‘ 
es others, i oe ‘aschuasjent appliances of any sort. The ore is spalled under- 
ground and brought 'e surface on the backs of men and boys whose burdens 
Vary from 100 to 125 Ibs, and who make during the day five trips to the bottom. 
The mine i > a ost 
: it 
