242 GEOLOGY AND MINING INDUSTRY OP LEADVILLE. 



Limestone to the south and belongs to the eastern member of the Yankee 

 Hill anticline, being a continuation of that found in the Andy Johnson 

 and other mines. 



The Little Champion (P-ll) and Greenwood shafts were still in this 

 body of vein material, the former at a depth of 200 feet, after having passed 

 through 30 feet of Wash and 15 feet of White Porphyry. The Clara Dell 

 shaft, close by, found Wash, 126 feet; vein material, 5 feet; White Porphyry, 

 95 feet; Adelaide Porphyry, 20 feet; and White Porphyry again, 121 feet. 

 The Rothschild (P-9) was sunk 65 feet in Adelaide Porphyry, while the 

 Leavenworth (P-4), a short distance east, reached the Blue Limestone after 

 passing through 220 feet of White Porphyry without finding the Adelaide 

 body, which must therefore go down very steeply on this line. The Louis- 

 ville (O-13) on the north and the Laura Lynn (O-15) on the south side 

 of Adelaide park are both in Adelaide Porphyry, while the Day bore-hole 

 (O 14) in the middle furnishes the following important section, as derived 

 from an examination of drill-cores: Adelaide Porphyry, 100 feet; White 

 Limestone, 87 feet; Adelaide Porphyry, 39 feet; White Limestone, 37 feet; 

 Lower Quartzite, 116 feet; Archean, 2 feet. It thus appears that the Ade- 

 laide Porphyry is here in part immediately above the White Limestone, 

 whereas in the Clara Dell it was in the lower body of White Porphyry, which 

 is wanting at this point. From the extremely short distance between the 

 Rothschild and Leavenworth and from the great depth of the Blue Lime- 

 stone in the latter, it is assumed that a probable angle of dip of the Blue 

 Limestone would bring it to the surface near the former, were it not that it is 

 here cut off by the Adelaide Porphyry, which must cross it nearly vertically. 

 South and east of the Day bore-hole again, the Park (O-4) shaft, the shaft 

 0-6, and the Lily (0-5) shaft find Blue Limestone beneath the Wash, 

 the last having reached White Porphyry beneath it. In the two latter 

 shafts and in the eastern Park (O-l) shaft the limestone has a cream- 

 colored tint, resembling decomposed White Porphyry, while in the west- 

 ern Park shaft it has the characteristic blue-gray color. The underlying 

 White Porphyry is cut in the adjoining shafts (0-10), (O-12), and Keno 

 (0-11), while Keno (O-7)- is near the probable line of the Adelaide 

 fault. The Horseshoe shaft, just south of these, at the head of Nugget 



