MINES 



157 



N 



Portal 

 Crossed bar where caved 



Top of steep scarp on surface 



E 

 Shaft 



Caved shaft 



Bottom of shaft 



Top of raise or winze 



Chevrons point down incline at 

 5- foot vertical intervals 



Outline of stope 



Accessible workings 



** 



Inaccessible workings 



Point of blocking of workings 



60 



625ft 



Country rock is sheared graywacke. shale, 

 greenstone, and limestone of the Francis- 

 can group 



520ft 



DATUM IS MEAN SEA LEVEL 



Position of inaccessible workings taken 

 from mining company maps 



FIGURE 98. Map of the San Mateo mine. 



