HIGHLAND CHIEF MINE. 



501 



coarse. Some four hundred to five hundred tons of quartzite gold ore, 

 averaging one and a half ounces of gold and four ounces of silver to the 

 ton, are said to have been taken from the mine, and one lot of 3,000 pounds is 

 said to have yielded thirty-one ounces of gold to the ton. A dike of White 

 Porphyry, cut in the eastern portion of the workings, may have influenced 

 the concentration of ore at this point. The quartzite is probably Parting 

 Quartzite, though the thickness of 60 feet given for the Blue Limestone 

 horizon seems small, especially as it is said to have been over ninety-six 

 feet thick in the adjoining Across the Ocean shaft. The vein material on 

 the dump of the latter contained a great many quartz-lined cavities, and it 

 is possible that what was taken for quartzite in the Great Hope was simply 

 granular silicious gangue like that in the Little Prince. 



SOUTH EVANS ANTICLINE. 



Highland chief mine. The vicinity of the South Evans anticline has evi-' 

 dently been a favorable locality for ore deposition, but the development of 

 the ore bodies has been retarded by the difficulty of understanding the 

 geological structure and the relative positions at which they occur. The 

 Highland Chief mine has been the most important ore producer of this 

 portion of the district. It is opened by a shaft on the brow of the hill 

 overlooking South Evans gulch and by a tunnel run in- to meet it part way 

 down the slope. Fig. 2 represents an ideal section on a broken line drawn 

 through the Highland Chief shaft (L-l), the tunnel (G-54), and the Eliza 

 shaft (G-58). 



Blue Lime-tone. 



Parting Quartzite. \Vhjte Limestone. White Porphyry. Gray Porphyry. 



