416 GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



had a slight incliuation to the westward as it approached the fault. These 

 workings, being now abandoned and partially filled up, could not be 

 explored. Similar conditions are said to have been observed In the develop- 

 ment of shaft No. 12, near the Carbonate line, while in the Carbonate 

 ground itself, at the Combination incline, the outcrop of easterly-dipping 

 beds comes practically to the surface at the mouth of the incline, and a drift, 

 now closed up, running westward from the mouth of the incline, is said 

 to have followed the ore body down on a westerly dip. The conditions of 

 this outcrop have been thus fully described because it has been the cause 

 of a long and expensive lawsuit between the ^tna and Carbonate mines. 

 The owners of the ^tna claimed that they had the outcrop of the vein, or, 

 in legal terms, "the apex," within their side lines. The owners of the Car- 

 bonate, on the other hand, maintained that theirs was the legal outcrop, 

 inasmuch as the ore was found at a higher level within their side lines, and 

 that they therefore possessed "the apex" of the vein, which is legally 

 defined as that portion which is nearest the surface. The rulings of the 

 judge were first favorable to the construction of the Carbonate, but were 

 afterwards reversed when it was proved by actual measurement that ore 

 was found within the ^tna claim one inch higher than at a corresponding 

 point within the Carbonate. 



Carbonate workings. — The Southernmost workings on the Carbonate prop- 

 erty consist, first, of the West Shamrock incHne, wliicli lies outside the 

 limits of the map, commencing at a point near the southeast corner of the 

 Carbonate claim, 240 feet south of the side line of the map, and running 

 parallel with that side line 160 feet, inclining into the hill at an angle of 

 18°. This incline has developed no considerable amount of ore and is 

 interesting only as showing the character of the formations along the 

 contact line at this point. The mouth of the incline is opened in a pulver- 

 ulent, blue limestone, with a floor of chert covered by a thin seam of 

 iron-stained clay. The actual contact of the limestone with porphyry is 

 probably above the line of the incline, which follows down on the chert 

 floor for some distance, when it passes into solid blue limestone, more or 

 less decomposed, or in which no bedding planes can be distinguished. 

 Small seams, from one foot to two feet in tliickness, of decomposed por- 



