NW 



1166N 

 " 5427 W 



ORE DEPOSITS 



117 



SE 



952 N_ 



5153W 



I 1300' 



1200' 



EXPLANATION 



CD::: 



1300' i 



Contact Outline of stope Fill or debris in 



Dashed where or level where stope 



approximately intersected by 



located plane of sec- 



tion 



Dashed where 

 projected 



STORES 



Silica-carbonate 



1200' 



Geology and workings by U. S. Geological Survey 



FIGURE 85. Cross section through the Warren slopes of the New Almaden mine showing ore bodies formed in a thin apophysis diverging 



upward from a large intrusive sill. 



rbonate rock 

 e contact 



EXPLANATION 



Intrusive contact, 

 showing eleva- 

 tion 



Dashed where pro- 

 jected, scalloped 

 on side of intru- 

 sive rock 



Stope 



Chevrons point 

 down incline at 

 5-foot vertical 

 intervals 



50 



50 



100 FEET 

 _J 



Workings and geology by U. S. 

 Geological Survey, 1945 



FIGURE 86. Map of La Ventura stope area of the New Almaden mine showing localization of ore bodies in silica-carbonate rock along the 



lower contact of an intrusive sill. 



