. Economic Papers. t this mine. It was operated by the Hampton Mining Company in 1906,when the accompanying notes were taken. The mine was also worked atearlier dates by white people. The country rock is mica gneiss, with north-south strike and a nearly vertical dip. The pegmatite is conformable, ornearly so, with the schistosity of the inclosing rock. It occurs in lens-shaped masses 3 to 4 feet thick. The mine has been opened by two shafts,40 and 45 feet deep and 15 feet apart, each one evidently having beensunk on a rich lens. In the space between the shafts, partly worked out,the overlappin
. Economic Papers. t this mine. It was operated by the Hampton Mining Company in 1906,when the accompanying notes were taken. The mine was also worked atearlier dates by white people. The country rock is mica gneiss, with north-south strike and a nearly vertical dip. The pegmatite is conformable, ornearly so, with the schistosity of the inclosing rock. It occurs in lens-shaped masses 3 to 4 feet thick. The mine has been opened by two shafts,40 and 45 feet deep and 15 feet apart, each one evidently having beensunk on a rich lens. In the space between the shafts, partly worked out,the overlapping of two lenses was well shown. (See fig. 18.) The gneissand schist walls bend around the lenses. Fifty feet south of the shafts anopen cut ^exposed a lens 2y2 feet thick and about 15 feet long lying in thegneiss. Some blocks of mica many pounds in weight have been is clay and iron stained near the surface and is used for electricalpurposes, and part has a clear amber color and is suitable for stove Figure 18.—Vertical cross section of pegmatite at Hensley mine, Yancey County, N. C. Young Mine—The Young mine is about 2 miles west of Boonford and100 yards west of South Toe River. The mine has been opened by cuts, pits,tunnels, and shafts covering a width of more than 50 feet and for a distanceof more than 200 feet. The workings extend from the south side over thetop to the north side of a ridge about 100 feet high. The mine has beenoperated at several different times, the last time by the J. E. Burleson Com-pany in 1904-5. The country rock is hornblende gneiss, biotitic near thecontact with the pegmatite. The pegmatite outcrop crossing the creek onthe south side of the ridge is about 100 feet wide. The strike of the forma-tion is about N. 35° E. and the dip 75° SE. Streaks or horses of mica schistare included in the strike of the pegmatite and are parallel with it. Themica occurs in streaks parallel with these bands of schist, and the latterare left as wal
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