592 MINING INDUSTEY. 



stream above Georgetown, and is three miles distant from the town. The 

 hillside rises very steeply from the bed of the valley. The lode on which 

 the mine is located bears the same name ; it crops out on the southern slope 

 of the hill, several hundred, perhaps a thousand, feet above the stream at the 

 base. It is said to be clearly traced for 2,000 or 3,000 feet along the hill-side, 

 but it was discovered and has been chiefly developed in the immediate neigh- 

 borhood and on the west side of the ravine that divides Brown Mountain 

 from Sherman Mountain. 



On Plate XXXV will be found a longitudinal section of the mine, which 

 represents the extent of the work that had been accomplished at the end of 

 August, 1869. The following are some of the results that appear from these 

 developments. 



The course of the lode is 62° east of magnetic north, or about 77° east 

 of true north, coinciding nearly with the trend of the hill. Its dip is vertical 

 to the depth of 80 feet, where it inclines slightly to the north at an angle of 

 75° from the horizon. The width of the vein is from 1 to 5 feet. The 

 country-rock, where observed by the writer, is a close-grained granite, con- 

 taining reddish feldspar and a fine black mica. The walls are very well 

 defined ; they frequently show polished and striated surfaces and are usually 

 separated from the main filling of the fissure by selvages of clay an inch or 

 two in thickness. The filling of the vein consists usually of an ore-seam 

 which is from 2 to 14 inches thick, averaging about 8 inches, and with this is 

 associated a gangue rock of somewhat varied character. The gangue, appa- 

 rently most intimately associated with the ore, is a mixture of quartz and 

 feldspar, the latter being sometimes in coarse particles. Sometimes this 

 material is talcose and finely laminated. Gangue of this character almost 

 always, if not invariably, accompanies the ore, frequently occupying the space 

 between the several seams of pay-mineral. In other parts of the vein, and 

 often closely associated with the foregoing, the vein-rock appears to be com- 

 posed of quartz, feldspar, and mica, presenting the appearance of true granite. 

 These two kinds of gangue rock sometimes occur separately, sometimes 

 together; in the latter case there is usually a marked difierence in their 

 appearance, hardness, color, and mineral composition, which suggests that 

 they are of different age or origin. 



