I 



BAIN.] MINES AND PROSPECTS. 49 



Genevieve limestone may be identified, and near the shaft sandstone, 

 presumably Cypress, rests on the limestone with a normal erosion 

 boundary. In some open cuts, and in the bed of the stream cross- 

 ing the vein northeast of the shaft, limestone may be seen on both 

 sides of the fault, and while the identification of the hanging wall 

 is not positive the rock is apparently the Ste. Genevieve. Still 

 farther to the northeast shaly and cherty beds take their place. Mr. 

 Ulrich identifies them as probably Birdsville, and this would require 

 a small block of higher strata faulted down to the general level. 

 This block is indicated on the map, but with no pretensions to accu- 

 racy of outline. 



From the shaft the Empire vein has not been traced far to the 

 southwest, the presence of sandstone on both sides making surface 

 identification somewhat uncertain. Fluorspar is, however, reported 

 from its probable extension in section 34. From the shaft south the 

 sandstone seems to be cut off to the east by a second fault extending 

 from the Empire to the Hubbard shaft, and at a number of points 

 along this line fluorspar has been found. 



The workings of the Crystal Fluorspar Mining Company con- 

 sist of a large open cut and a shaft sunk on the vein, which was 127 

 feet deep when visited, and has since been continued to a depth of 

 1()0 feet. In the open cut a wall of solid white fluorspar was at one 

 point exposed, dipping to the east parallel to the hanging wall of the 

 vein. Against it and in the V-shaped angle between it and a perpen- 

 dicular plane to the surface was a body of zinc carbonate. This is 

 said to run 38 to 40 per cent of metallic zinc, and has the appearance 

 of being of fair grade. The amount exposed was not large, and the 

 total amount present is wholly unknown. It is associated with re- 

 sidual clay, and seems to represent surface concentration against the 

 hanging wall of the vein. 



In the shaft a vein usually from 6 to 10 feet wide and with well- 

 developed walls is shown. The vein matter consists of brecciated 

 limestone cemented by fluorspar and calcite intimately intergrown. 

 In this matrix galena, blende, pyrite, and chalcopyrite occur, the two 

 first named being frequently in considerable abundance. The sul- 

 phides, particularly the blende, show a tendency to replace the frag- 

 ments of limestone and also to some extent the wall rock. Occa- 

 sionally they are segregated in a distinct band, which in one place is 

 as much as 4 inches thick and occurs along the hanging wall. It is 

 rather noticeable that the sulphides are for the most part very fine 

 grained and are intimately associated with the wall rock and the 

 gangue. The dark shaly material found in the hanging wall is 

 rather widely distributed through the breccia. 

 Bull. 355—05 M 4 



