Bisbee daily review., 1919-05-11
ushpemins, Mich, 4ron ore.")


 Almost every visitor who looks over the mine and plant of the New Cornelia Copper company remarks, before leaving Ajo, that he had little conception of the magnitude of the property and it's value to Calumet & Arizona Mining company previous to his personal inspection. There is no doubt of the fact that New Cornelia is a big mine, and rich one and that it is growing larger with every days work. The ore is present in great quantities and the finished copper, 99.6 per cent pure, is being laid down in New York at very low cost, this considering the present price of ev- erything connected with the mining, crushing, teaching, freightage, etc. As was stated in a recent article on the property in Iron Ore, the company is credited with being the second lowest-cost producer in the United States which is a real surprise to many mining men who had viewee the experiment rather doubtfully, they believing that the teaching would prove both a tedious and an expens- i've operation.
 
 If the metal were needed New Cor nelia could, with it's present equip ment, turn out 100000 pounds a month, and this creditable perform ance will look small in a few years, when the market calls, and when the big sulphide deposits are attacked in earnest and to something near capac- ity. Plans are now under way for the benefication of the sulphide masses, and these will be going into the oil flotation plant long before the carbonate ores have been exhausted. As we stated in our recent article on the property, the carbonates will last from five to eight years, according to the vigor with which they will be handled, and this means as the mar ket will warrant.
 Experimental Plant to Be Ready in
 Juno
 The experimental oil Notation plant, with a capacity of several hundred tons day, will be ready next June and ball mills, rod mills and other types of fine grinding machines will be thoroughly tested before decision is reached as regards the type to be aQODLGu. are considered ideal ores for flotation treatment, the copper content being a trifle better than 1.50 per cent, and the chalcopyrite being well dissemf- mated.
 In all probability a flotation plant to handle 10000 tons daily will be decided upon which, with recovery of about 80 per cent, will result in about S6,000,00 pounds of copper be- ing produced yearly. It is safe to add, however, that the recovery will be close to 90 per cent, but the manage ment is very conservative in all of it's estimates and predictions.
 4o,ooo,ooo Tons of SuIphides DeVeI-
 oped
 There are now about 4O,O0O,o0O tons of low-grade sulphide ores developed on the property, and we will now ven ture the prediction that this tonnage will be increased to 75,000,000 before the development work is completed. Some idea of the company's holdings may be gained from the fact that 1t requires about two and half hours to lope a horse around the outer linn it's of the claims, and lot of this ter ritory has as yet hardly been scratch ed by a prospector's pick. Nineteen drill holes were stopped in ore and one hole that was put down to a depth of 1000 feet was in values when drill ing ceased. This deepest hole was put down on the edge of the ore body as then determined by engineers and geologists. and not in the center of the deposit. No ore, in the original estimates, was claimed below a depth of 500 feet, and none figured, but there are good reasons for believing 1t exists below this level.
 Gold in the smphides
 Iron Ore as made the statement that New Cornelia will produce copper as cheaply, or cheaper, by the oil flo- tation process as by teaching, a pre- diction that may sound strange to those not wholly familiar with local conditions. It is the general suppo- sition, probably, that copper can be made at a lower cost by the teaching process than with a mill and smelter, but we base our claims on the oppo- sit on the fact that no waste has to be handled in getting at these sul. phide ores; that a lot of the equip ment used in transporting and treat. ing the carbonate ores will be avail able for the new plant; that the sul phides car. be mined for approximate ly 30 cents ton under present wage scale. etc, and that the 40,000,000 tons of sulphide ores here developed carry an average of 45 cents a ton in gold
 Little has been said regarding this element in the ore structure, but if is estimated that from 30 to 35 cents a ton in gold will be saved from each ton of ore treated and we regard this