226 GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



Little Ellen Hill, between South Evans and Evans gulches; it is coarser 

 grained than the normal rock and contains numerous quartz crystals. The 

 successively higher horizons of Lower Quartzite, White Limestone, Blue 

 Limestone, White Porphyry, and Weber Shales are crossed as one ascends 

 the hill to the eastward, their existence being proved by the numerous 

 shafts which dot this point of the hill. A small body of quartz-porphyry 

 is found on the slope of the hill toward South Evans gulch, between the 

 Parting Quartzite and White Limestone, which may correspond to that 

 found on the other side of the anticline in K-14. The contact of the Blue 

 Limestone with White Porphyry has been proved in the Virginius, Tender- 

 foot, and Cleveland shafts, where it is more or less replaced by vein mate- 

 rial, and in the first is said to have contained large bodies of low grade and 

 some rich ore. Southward across South Evans gulch this contact is practi- 

 cally unprospected. 



The north slope of the anticline is proved on the north side of Evans 

 gulch, in the United States Mint shaft (G-38), which is sunk in the shaly 

 beds at the top of the Lower Quartzite. The northern rim of the anticline 

 is buried below 400 feet of gravel of the Evans moraine, and it is only on 

 the steeper slopes of Prospect Mountain, adjoining Little Evans gulch, that 

 rock in place is found. Here the workings of La Harpe, Stillwell, Little 

 Louise, Grolden Eagle, and other claims have proved the contact of the main 

 Gray Porphyry sheet and the overlying Weber Shales. The main Gray 

 Porphjny sheet is not found east of the South Evans anticline, and there- 

 fore must thin out rapidly beyond these claims. The body of Mount Zion 

 Porphj-ry, which crosses Evans gulch above the Ball Mountain fault, as 

 already described (if, as supposed, an interbedded sheet), comes between the 

 Weber Shales and the Weber Grits, commencing opposite where the Gray 

 Porphyry sheet dies out. 



AREA BETWEEN WESTON AND MIKE FAULTS. 



M'ke fault. — The Mike fault runs more nearl}- parallel with the Weston 

 fault than the Ball Mountain fault. On the soutli it extends a short distance 

 beyond the limits of the map, as shown in discrepancy of outcrops on the 

 soutli slope of Long and Deny TTill, but it cannot be traced beyond the 



