. Economic Papers. rkings and contains a large quartzstreak through part of its course. The mica occurs in the feldspar streaksbetween the quartz and wall rocks. It has a clear light color and much ofit is of good quality, though a portion has the A structure. J. H. Rochester Mine.—The Rochester mine is one-third mile southeastof Ocala post-office. It comprises two workings on different pegmatitebodies. In the one to the northwest an incline had been run down on thevein. The country and wall rock at each opening is pegmatized micagneiss striking N. 30° E. and dipping 50° SE. The pegmatite is c
. Economic Papers. rkings and contains a large quartzstreak through part of its course. The mica occurs in the feldspar streaksbetween the quartz and wall rocks. It has a clear light color and much ofit is of good quality, though a portion has the A structure. J. H. Rochester Mine.—The Rochester mine is one-third mile southeastof Ocala post-office. It comprises two workings on different pegmatitebodies. In the one to the northwest an incline had been run down on thevein. The country and wall rock at each opening is pegmatized micagneiss striking N. 30° E. and dipping 50° SE. The pegmatite is conform-able with the inclosing gneiss and about 3% feet thick. About four-fifths ofit, as exposed, consists of quartz. The mica is more plentiful near the wallsof the pegmatite. The principal work was done 75 yards to the southeast and consisted ofan open cut 10 to 20 feet deep and 50 feet long on the outcrop, with a cross-cut tunnel and drifts, about 100 feet in all, at a lower level and under the o s> r~ O. Figure 13.—Plan of Judge Ferguson mine, Jack-son County, N. C. Mign., Mica gneiss. MINING INDUSTRY. 53 open cut, as shown in figure 14 (a) and (b). The pegmatite is from 1 to5 feet thick, and conformable with the inclosing gneiss. Massive quartzis more or less prominent in different parts of the pegmatite. The micais clear and has a dark-brown color with a tinge of green.
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