TO THE COPPER MINES. 235 
“Presidio” or fort, which commands the approach 
from the cafion below. It is of a triangular form, each 
side presenting a front of about 200 feet, with circular 
towers on the corners. It is built of adobe, with 
Presidic at the Copper Mines. 
walls from three to four feet in thickness, and a single 
opening on the eastern side. This building was in so 
good a state of preservation on the arrival of Colonel 
Craig, that in a few weeks he built up such walls as 
had fallen, restored the roof, and made the whole ten- 
antable for himself and his command, furnishing be- 
sides store-rooms for all his provisions. There were 
also some fifty or more adobe buildings, some of them 
in good preservation, except the roofs, and others in a 
state of complete ruin, The adobes-were therefore 
