294 CAVE AND CLIFF DWELLERS. 
reputed to be many millions, and this 
we could readily believe while passing 
through a portion of their vast posses¬ 
sions. There are now in the Urique 
district a dozen bonanza mines worked 
by the old Spanish system, which would 
yield enormous revenues if there were 
any method by which the ore could be 
transported at reasonable rates. From 
almost any point on the one street of the 
town you could look up the steep moun¬ 
tain sides and see three or four of these 
old Spanish mines. The method of 
working them was wholly on the same 
plan as that adopted a hundred years 
before, even the machinery being of the 
most primitive type. 
That night I took a swim in the Urique 
River and found the water as warm as 
fresh milk, although the water I had used 
