|
TREATMENT OF SULPHUKET ORES AT CHARACTERISTIC MIXES. 121
Xo satisfactory figures regarding the value of the tailings from either the concentration or clilorination could be obtained; the figures given were high as compared with those of other mines. The cost of milling, concentration, roasting and clilorination per ton of ore milled was given at $1.80 per ton. This excessive cost, almost three times as much as that at the Franklin mine, an almost identical case as far as the plant and the thickness of the ore-body are concerned, must no doubt be greatly laid to the fact that an attempt is made to supply a plant with a nominal capacity of 40 tons in 21 hours from a mine, in which the development does not warrant an output of 10 tons in this time.
The percentage and value of concentrates given above, with the addition of the gold saved on the plates, gives an estimated value of from $1 to $5 per ton to the ore mined, without including in this value the gold lost in tailings. Such an ore if found in sufficiently large bodies on developing the mine, should pay a profit with the above method of treatment under a close management.
Experiments were made with cyanide in 1896, but were not successful.
THE FRANKLIN MINE (CREIGHTON MINING AND MILLING COMPANY), CHEROKEE COUNTY, GA.
This mine is situated on the Etowah river, about 16 miles northeast of Canton, the county seat. Geologically it is in the Georgia belt. The proposition presented here is in most respects similar to that at the Reimer mine.
The country-rock consists of gneissoid mica- and hornblende-schists, often garnetiferous. The general strike is X. 55° E. and the dip 40° S.E. Granite dikes are stated to exist in the vicinity of the mine, but none have been as yet found intersecting the ore-bodies. The character of these ore-bodies has been described (p. 23). There are two parallel veins about 150 feet apart, known respectively as the Eranklin and the MacDonald. Of these, the Eranklin has been most extensively opened, and is the only one that has been worked during recent years. The strike and dip of the veins are, in the main, coincident with those of the country schists. The mineable ore exists in lenticular shoots or cylinders pitching 45° E\E. (see fig. 20). Four such shoots had been opened in the mine within a horizontal distance of about 750 feet on the strike, at the time of our visit. The largest one of these has a maximum length of 120 and maximum width of 14 feet. The average thickness of the ore-bodies is probably about 3 feet. All but one of the' ore-shoots crop out at the surface, and they show considerable permanency in depth. The 350-foot drift in the mine was extended in a northeasterly direction about 400 feet beyond the last ore-shoot. Although a permanent vein with clay casings, and in places heavy quartz-
|
||
|
|
||