Bulletin Volume 26-27 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...the district. The two shafts, one 410 and the other 160 feet deep, make a total of 570 feet of shafting. From these shafts a total of more than 4,000 feet of drifts has been driven in the vein. and in addition a small amount of cross.cutting has been done at different places in the drifts. Practically everything accessible in the main ore shoot above the 335.foot level has been stoped out. A small amount of stoping has also been done on the 407.foot level, the deepest level in this ore shoot. A second ore shoot is indicated in the 155. and the 335.foot levels. respectively, beginning about 500 feet south of the shaft. A small amount of stoping has also been done on these levels in this ore shoot. Immediately south of the shaft the stoped ground is caved from the surface down to the 260.foot level, and much of the area north of the shaft, while not caved, is inaccessible. Timbering was not as well done as it should have been and consisted almost wholly of stulls and lagging. Air drills and modern equipment were used in driving and stoping, and both overhead and underhand stopes were worked. The ore was in some instances roughly sorted underground and as much waste as possible eliminated before hoisting. The ore after sorting was trammed to the shaft and hoisted in a small skip. From the shaft it was trammed to bins at the mill from which it was drawn as needed. Geologic relations.--The rock at the Durgy mine is the tuffaceous phase of the Virgilina greenstone with very large fragments, and shows more clearly its volcano.sedimentary character than at any other opening in the region. A great part of it shows the usual and normal green color, but here and there are areas that have a dark purplish color, and in a few instances fairly massive, somewhat porphyriti...