M. Tuomey on a Copper Mine in Tennessee. 181 
[The paper closes with an enumeration of the measurements of 
crystals of the Achmatowsk Clinochlore witha Mitscherlich’s go- 
niomer, by which the angles were obtained. he mean for 
P: M from 12 measurements of one crystal was 113° 58’; (the 
extremes 113° 574’ and 113° 5832’) from another 113° 56’; from 
a third 113° 564’; giving for the mean of the three 113° 563 
For M: M from No. 1, 125° 38’, for No. 2, 125°37’. For P: 0 
from crystal No. 3, 102° 64’; from crystal No. 5, 102° 6’; from 
crystal No. 3, P:n=118° 28’; from No. 6, P : t=108° 11’; 
from No. 2, M: t=124° 34; from Nos. 2 and 3, t:n=124° 32’; 
from No, 4, 124° 30’; from No. 4, P: x=125° 4’. From No. 
7, P:d=119° 5, m:i=150° 0] | 
Arr. XVIII.—A brief notice of some facts connected with the 
Duck Town, Tennessee, Copper Mines ; by M. 'Tuomey, State 
Geologist, Ala. 
Kwnowine that Dr. Curry of Nashville, and Mr. Proctor of the 
Tennessee Mines, are preparing a memoir, that will include the 
history, geological and economical relations of these mines, I in- 
tend to confine myself to a fact or two that I observed during a 
hurried visit to the place, and which may be worth being placed 
upon record. 
Notwithstanding the excitement produced by the discovery of 
t mines, the current accounts of the richness of the ore, and 
great thickness of the beds, are not greatly exaggerated. 
In a short but very lucid report, Mr. Whitney has presented a 
clear view of the state of some of these mines which he was 
Ocoee river, exposed an admirable section of 24 miles in length. 
he 
. +e mines are situated at t : 
Junction of the silurian and meta- LER, 
morphic rocks,—or as Mr. Whitney = | 
suggests, the cupriferous slates may 
be altered silurian strata. ‘ q 
The accompanying cut presents { 
the position, and relation of the | 
Metalliferous beds at all the mines: 
%, Upper portion of the bed com- 
sed of a porous, amorphous mass 
of red and brown oxyd of iron, the 
S0ssan of the Cornish miners, iron 
hat of the Germans, which is the 
tesidue of the ore’ after the copper 
