J. P. Kimball on the Silver Mines of Sta. Eulalia, Mexico. 163 
and which, continued for sixty-two years, ending in 1789, 
- amounted to 800,000 dollars.* 
The Sta. Eulalia mountains are a portion of a long range 
trending N.E.—S.W., one of a system of parallel ranges, 
which, separated by champaign valleys or valley-plains, ae 
in which, at distances of two to five miles, the mines are 
Situated, and which are crossed only by Sriclenpaths _The 
mining ground is embraced within the area of an uplift of 
the Cretaceous fossiliferous limestone, imparting toward the 
di This i i 
to the Rio Grande in an axis parallel to the Conchos river, an 
own in Mexico as caniera, caps the s 
under similar conditions of superposition of the latter, the 
._* State archives. Ward erroneously states this bah — sa ree dur- 
nine i bonanza, ii, p. 581. ( it., p. 30 
Th etintoatied pops, Pegi aga, ns the far higher sees of not larger 
i w it 
aes the availableness of mechanical appliances, that our great production of 
iver is more to be ascribed than to the ber or superiority of r scovel 
What account of the Comstock lode by this time should we have were its mines, 
f those i of their activity, 
