CRESCENT MINE. 431 



beyond the No. 1 or Blacksmith shaft, where the limestone is rising rapidly 

 to the surface. It was generally found as a thin and somewhat irregular 

 sheet of sand carbonate, averaging perhaps a foot in thickness. Toward 

 the Catalpa line on the fourth level it thickened to two and a half feet and 

 carried 100 to 500 ounces of silver to the ton. Between the upper part or 

 southwestern end of the body and the Catalpa line is an area which has 

 proved barren of pay ore, so far as explored, though vein material is prac- 

 tically continuous through it, carrying always a certain amount of silver. 



On the line of the incline, as is shown in the section, there is a ridge 

 of limestone between the third and fourth levels and another just beyond 

 the fifth. To the north, towards the Catalpa line, these two ridges have 

 come together, and the steep dip, which in the incline is beyond the fifth 

 level, is here between the fourth and fifth, as the converging of these two 

 drifts shows. East of this line the contact has been found practically barren, 

 though showing considerable replacement material, consisting of oxides of 

 iron and manganese which all assay a few ounces in silver. Between the 

 eighth and ninth levels is a deep trough, produced by a fold and possibly 

 accompanied by some displacement, similar to that in the Carbonate mine. 

 A winze was sunk here, said to have been 80 to 100 feet deep, in vein mate- 

 rial, but it was no longer open, and the information is somewhat uncertain. 

 The south drift on the eighth level runs along the edge of this trough on 

 the contact, which dips 70° to the eastward. The extremity of the south 

 drift on the sixth level, which follows the curves of the contact, rises 20 feet 

 over the ridge of limestone which crosses the incline below No. 3 shaft, and 

 finds a small body of ore, which deserves further prospecting. 



Catalpa mine. — Although the first discovery of ore on this ground was 

 made in the gossan, or iron outcrop at the surface, the mine was opened 

 through a shaft sunk high up on the hill, which reached the contact at a 

 depth of 170 feet and near the eastern limits of the main ore body. From 

 this explorations were carried upward to the west, and a second shaft, the 

 New Discovery, has lately been sunk to develop the ore shoot extending 

 up toward the surface, which has not yet been thoroughly explored. 



As the svu-veys in this mine had been carried on without any systematic 

 determination of level in the drifts, as is often the case in Leadville mines, 



