520 MINING INDUSTEY. 



so-called Gregory crevice and 800 feet on the Briggs. Both veins, or 

 branches of the same vein, are worked by this company for the distance of 

 about 250 feet, measured from the Briggs claim, beyond which neither has, so 

 far, been found very productive. The Gregory branch has been worked to 

 the depth of about 150 feet, below which it has not been much developed, the 

 work having been chiefly confined in depth to the Briggs branch. This lat- 

 ter has been worked to a depth of more than 550 feet, and has furnished 

 by far the greater portion of the whole product of the mine. It is on this 

 property that the divergence of the two branches is so far found to be the 

 greatest, but little being known of their relations to each other further east. 

 In the crosscut, at a depth of 240 feet, they are 72 feet apart. The two 

 branches maintain on this property the courses observed further west with 

 considerable regularity, that of the Gregory being generally north 45° east, 

 and that of the Briggs north 55° east, true ; but so far as observed, that is to 

 a depth of 150 or 160 feet, they have a more divergent dip, that of the Greg- 

 ory being about 80° to the northwest, while that of the Briggs is generally 

 about 80° to the southeast. 



The Briggs has received the most development. Its average width is 3 

 or 4 feet. Its walls are not always well defined. The filling of the vein is 

 generally similar to that already described. Seams of solid iron and copper 

 pyrites, chiefly the former, occur with belts of quartzose and feldspathic mate- 

 rial, carrying ore more widely distributed through the mass. In the bottom 

 of the mine, where, by reason of the underhand stoping and lack of reserve 

 ground, the only opportunity is afforded of seeing the ore-vein in place, there 

 was a strong seam of iron and copper pyrites visible at the time of the writer's 

 visit. The mine for some time past has been producing at the rate of 600 or 

 800 tons of ore per month for stamping, besides a small proportion of first- 

 class, of about the same quality as the first-class ore of the Briggs Company. 

 The milling ore is said to produce six ounces of crude bullion to the cord, 

 worth $100 in coin, or $13 to $14 coin per ton. The costs of mining and 

 milling are stated at about $12 in currency per ton. 



The mine is provided with a 25-stamp mill, conveniently placed at the 

 mouth of the shaft. It has been rebuilt within the past year and has great 

 advantages for economical work. The engine in the mill furnishes power for 

 hoisting and pumping from the mine. 



