1857.] 



ANSTED — MINERAL VEINS. 



247 



Fig. 4. — Map of the Duektown Mineral District y Tennessee, U.S., 

 showing the principal Gossan-lodes and Quartz-veins. 



Dimensions of the Gossan-lodes. 



Average 

 Length. width. 



. 2600 yards. 30 feet. 

 . 900 „ 15 „ 



. 600 ,, 250 „ 

 900 „ 25 „ 



Reference to the nature of the 

 Rocks. 



1. Blue slates. 



2. Talcose schists. 



3. Ferruginous schists. 



4. Hard schists. 



5. Talcose, steatitic, and garnetiferous 

 schists. 



At 1* is a small development of horn- 

 blendir rock; and at 3*, of diorite : 2* 

 marks thr position f>f a remarkable kno 

 of quartz-rock referred to in the text. 



Quartz-veins. 



Approximate boundaries of the different schists. 



The gossan-lodes are indicated by shaded lines. 

 AB and C D, lines of sections, figs. 5 and 6, p. 248. 



t The main portion of the Hiwassee lode having the average width above stated does not 

 extend for more than l600 yards. There are, however, proofs of its extension beyond the point 

 marked a, though with a much less width. 



VOL. XIII. PART I. T 



