428 GEOLOGY AND MINING INDUSTEY OF LEADVILLE, 



the litigation arising from the claim of damages by the ^tua mine that 

 admission to the Glass-Pendery mine was for a long time utterly refused, 

 only a single hasty visit being finally conceded for the purposes of this 

 work. This refusal was particularly unfortunate, as the information to be 

 obtained here has a most direct bearing on the question of the existence of 

 ore further west under the city of Leadville. The existence of the Pendery 

 fault, on which an incline is sunk 100 feet below the main level, was, how- 

 ever, ascertained beyond a doubt, with the strong probability of a slight 

 western dip in the limestone adjoining the Pendery fault. (See Sections 

 H and I, Atlas Sheet XXX.) Had the incline on the Pendery fault been 

 continued, there seems to be little doubt that the limestone would have 

 been struck in it at no very great depth, and definite data could thus have 

 been obtained in regard to the ore horizon under Leadville. 



The ore body which passes through the Glass shaft seems to have been 

 a fracture or fissure in the limestone, partly filled with White Porphyry 

 from the main sheet above. A section of it where it crosses a drift north- 

 west of the shaft is given in Fig. 2, Plate XXII, in which it is seen that 

 replacement action has followed the walls of the fissure on either side of 

 the porphyry, the rich ore being confined, however, to the hanging wall. 



In the ^tna ground a small body of Gray Porphyry is found in the 

 drift just west of the main shaft. To the southeast of this shaft the lime- 

 stone is singularly bleached and disintegrated, but no ore is found. The 

 main large ore chambers occur north of this shaft, not far from the Pendery 

 line. They extend up in places nearly, if not quite, to the contact plane, 

 and are wedge-shaped or tajjering toward the bottom. The ore in these 

 claims is said to have contained little or no lead. 



The Meyer shaft was sunk 50 feet pei'pendicularly to the fault, then 

 followed the fault plane to the contact, from which point a drift was driven 

 to meet these large chambers. The fault plane, like that of the Iron fault, 

 was found to contain a certain amount of pay ore, mixed with attrition or 

 selvage material, but none was found outside its walls in the iimestone. 

 The fissure is quite regular in its inclination, which shallows somewhat in 

 depth, and is from one foot to three feet in width The evidence here, as 



