MARYiNE.] GOLD HILL MINING-REGION. 687 



west. On the east side is the Red Cloud ; on the west, the Cold Spriuo- 

 mines. The former, upon a casual examination, showed a well-defined 

 hanging-wall, or that on the side of the porphyry, a vein usually three or 

 four feet in width, but in places pinching out to a few inches, with at 

 one point a clay-like "gouge," and an indefinite foot-wall on the side of 

 the coarse gneissic granite, which is here the country- rock. Some of 

 the vein-matter appeared as if a decomposed granite, while the pyrite is 

 the most frequently occurring mineral in the dull quartzose gangue of 

 the vein. 



