CENTEAL AND EASTEEN NEVADA. 359 



grade ; but the work, as originally commenced, was abandoned, and the shaft 

 here referred to was sunk to cut the vein in depth. The shaft, however, 

 passed through the supposed region of the vein without cutting anything that 

 could be identified as the Oregon; and was then continued for the purpose of 

 working the North Star vein at greater depth than could be conveniently 

 reached by the Manhattan shaft. The Oregon shaft cuts the North Star vein, 

 or what is recognized as such, at a depth of 511 feet from the surface ; and 

 at this point another level is opened on the vein, which is about 100 feet ver- 

 tically lower than the lowest level opened by the Manhattan shaft. On this 

 level drifts are run both east and west. The latter, in September, 1869, was 

 500 feet long. The east drift was not extended so far. They are connected 

 by a winze with the level above and some productive stopes have been made 

 in the intermediate ground; but the vein at this depth seems less abundant in 

 rich ore than were some portions of the higher levels. The production of the 

 mine has, however, been well sustained. 



Throughout these works, the extent of which has been briefly indicated, 

 the vein presents the general characteristics already described. The western 

 portion of the mine appears to be the richest, but the difficulty of working it 

 is much increased by the disturbances or movements which have taken place 

 in the ground, breaking the continuity of the vein. The chief cause of this 

 appears to be a cross-vein, striking about north and south, and dipping west- 

 ward at an angle of about 30 or 40 degrees, along which line of fracture the 

 country-rock seems to have moved. This slide or fault is encountered in each 

 of the levels from the surface to the bottom of the mine. Search has been 

 made on each level beyond the slide for the continuation of the vein, but with- 

 out entirely satisfactory results. On the bottom-level the slide was found be- 

 tween 300 and 400 feet west of the shaft ; by driving on through it a short 

 distance, a vein, having the course, dip, and some of the general characteristics 

 of the North Star, was found and foRowed for more than 100 feet ; but it was 

 poor in ore, almost entirely barren in places, and there was much doubt as to 

 whether it was the continuation of the North Star or some other vein of the 

 series. 



This may illustrate one of the great difficulties experienced in working 

 the mines of Lander Hill. The veins, or what are recognized as such near 



