90 GEOLOGICAL SURVEY OF ALABAMA 



Near the main slope in the upper left, and in the lower 

 right entries, very large crystals of mica were taken out, 

 one weighing over 200 pounds. With the exception of a 

 few stulls, no roof support in the form of timber sets or 

 lagging had been placed in the entries, and but little at- 

 tempt at effective timbering made on the slopes in conse- 

 quence of which neglect, most of this work partially 

 caved in at the first rise of mine water, becoming unsafe 

 and was subsequently abandoned. A heavy showing of 

 mica observed in concentration on the upper contact at 

 the foot of the main slope, was thereby involved in this 

 fall, and never recovered. 



The pegmatite body entered is made up of an unusual 

 amount of quartz in large masses, around which consid- 

 erable mica was recovered, the feldspar being kaolinized 

 in the upper levels, but large unaltered in the lower en- 

 tries. The unaltered spar, carried by analysis, 10 per 

 cent, potash. The larger proportion of mica recovered, 

 was next the contacts and principally with the hanging 

 wall, which is a garnetiferous mica gneiss. 



In all, some 50 tons of mica of all classes was recovered 

 in this mine, very little of it being of A-form, and that 

 only near the surface. The large crystals taken out 

 were mainly defective on the edges, but carried good flat 

 mica sheeting well in the body of the crystals, some of it 

 of large sizes. 



It is a flat amber muscovite of very light color, con- 

 taining no spots or inclusions, and by tests made, of 

 high dielectric quality. 



The general mine run of sizes are somewhat indicated 

 by the last graded stock sold, which ranged from circle to 

 6x8 inch, 10 per cent, of the lot running from 3x3, to 

 6x8 inch. 



Owing to inability to secure competent ancl experi- 

 enced management and to properly grade and market 

 the mica stock recovered, the mine has been recently idle. 



Exhibit samples, serial No. 124 are from this mine. 



Delta Mica Mine. The Delta mica mine is located in 

 the S. E. % of Section 4, Township 18 S., Range 9 E., 

 being in the N. E. corner of the county, 1/2 mile S. of the 

 Cleburne county line. It is the property of, and has been 



