308 Scientific Intelligence. 
ery stals of red oxide, while copper-vitriol, as a result of oxidation, 
often impregnates these more or less porous or cellular ores, the 
drainage-waters from which yield considerable quantities of the 
salt. The product of cement copper obtained at Ducktown by 
passing the water from certain of the workings over scrap iron is 
equal to about 5,000 pounds monthly, and the waters hold, in some 
h 
. 
cases, as much as one part in 1,000 of copper, though generally 
The study of these deposits in Ducktown and in Virginia has 
convinced me that the rich purple, gray and black sulphurets of 
ese so-called black ores are found in direct contact with the 
unchanged sulphids of the Ducktown lodes, and it is by an error 
Ducktown varies from twenty to ninety feet, while the great 
middle lode, on which the Isabella and Eureka Mines are situated, 
attains more than 300 feet. All portions of these immense lodes 
not being equally rich in copper, it has been found advantageous, 
for the purpose of exploring them and of metre what parts 
diamond-drill which has just been em loyed at Ducktown pee 
remarkable success. The great 300 foot lode, dipping to the 
southeast at a high angle, has been traversed by two eres 
nearly at right angles to the plane of the lode, and the inspee 
of the ores removed shows the existence of two large poner $ 
workable copper ore interposed in the enormous mass of bie 
which require only to be opened by a shaft to greatly are 
the produce of this region. Some details of the mining and sme! 
ing of these ores, together with observations on the tuture ig 
tance of these deposits as sources both of copper and sulphur, nd 
and more accessible lodes of a similar 
in Southwestern Virginia, must be reserved for @ thir 
Engineering and Mining Journal, N.Y. —T. STERRY pote 
Bosto 25, 1873. eT 
4. On the Situation and Altitude of Mount ee 
W. A. Goopyzar, C.E.—On the 27th day of July, eter! to 
M. W. Belshaw, of Cerro Gordo, and myself, rode our M7 
> 
the highest crest of the peak southwest of Lone Pine, ‘of Mount | 
over three years now, has been known by the nam : 
Whitney, and which was ascended and measured as such " ae 
Clarence King, in the summer of 1871. A full account 
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