SILVER MINING IN COLOEADO. 599 



taken. A shaft lias been sunk on this vein to the depth of 62 feet, showing 

 an ore-seam 8 or 10 inches wide. The ore at this depth is chiefly zincblende, 

 but carrying the other minerals already mentioned as characteristic of the 

 lodes on Brown Mountain. Some of the ore has a high assay value, but not 

 much has been worked. The course of the vein is north 80° east, true, 

 dipping almost vertically. 



Bakee. — The mountain slopes, bordering the right hand fork of the stream 

 above Georgetown, have been explored, more or less, along their entire length 

 Three or four miles above Brown Mountain, and about seven miles from 

 Greorgetown, Kelso or Quail Creek enters the main fork from the south side. 

 At this junction is situated the mill of the Baker Mining Company, a large 

 and costly establishment. The mine of the same company is located four 

 miles from that point, on the eastern slope of Kelso Mountain, near the head- 

 waters of the stream. It is not far below the crest of the range, having, it 

 is said, an altitude of over 11,000 feet, and being in the immediate neighbor- 

 hood of Gray's Peak, which has an elevation of about 14,300 feet. The 

 mine is probably more extensively opened than any in the Georgetown dis- 

 trict, though, thus far, the vein has not been very productive. The general 

 strike of the lode is about north 80° east, true, dipping northerly at an angle 

 of 55° to 60° from the horizon. The width is variable, generally about 3 

 feet, but sometimes expanding to 15 feet, or more. The inclosing rock is 

 granite or gneiss. The walls, particularly the south wall, are good and well 

 defined. The vein-matter is generally a mixture of quartz and feldspar. It 

 is usually soft and separated from the walls by a seam of clay. In some parts 

 of the vein the filling is chiefly siliceous, and sometimes becomes a hard flinty 

 substance, without showing much ore. The ore-seam is not continuous. So 

 far as developed, when visited by the writer, the pay-mineral occurs in dis- 

 connected bunches, or pockets, and not very abundantly. The ore consists 

 chiefly of galena, zincblende, and silver sulphurets. The associated gangue 

 is mainly quartz, but in the lower levels an abundance of fluor spar is a char- 

 acteristic occurrence. The mine has been opened by three tunnels or adits. 

 The upper one, known as the Discovery tunnel, was, in the autumn of 1869, 

 about 200 feet long, driven in upon the vein, having started at the outcrop ; 

 the two lower tunnels are partly in the country-rock and partly on the vein, 



