Bisbee daily review., 1911-09-05

profit of more than S2 a ton There is dump of waste near the mill-and
 this. too. is being milled to good profit. The work in the mine at this time is strictly prospecting and devel- oping, so the discovery that these old
 waste dumps and the stope filings carry good values was interesting, as 1t permits of the operation of the ten available stamps without doing any mining Occasionally, of course, the material taken out in development is run through the mill. in order that exact knowledge may be had Of values on an operating hasis. There has been Q great erosion throughout this basin, and much water action is noted. The andesitic dykes are prominent and noticeable at inteSyals for many miles. The orebearing material has always been called granite; but it may better be named granitic-porphyry. for such it is, and that it is all brecciated shows the movement to have been of great duration. The greatest depth reached is 465 feet; and at this depth the orc is oxidiZed just as 1t Is on the sur face. Throughout the whole fiat, which is about 3 miles wide and S long, gold may be banned anywhere. North Of it several miles are small properties sayiGg some development, tEe ore being gold It is the same to the east Some s miles southeast, however o0 the other side of the Superstition mountains, copper comes in in quanti- ties. one mine now being worked in a small way carrying copper. gold, and silver. But in the Mammoth sec ton there is nothing but gold, with Of course just a little silver, as Is al ways the case. It is the general be- lief that Mir. Young will be success ful in his efforts to operate the Nam uloth on the basis of large tonnage for pro;tt on low grade ore; and there seems lo reason for believing that oth- CT large pSaperties will deyelope on the same basis. There will be a nee essary expenditure of large sums of money to accomplish this. The work So far done has resulted 10 justify this expense. In sinking the main shaft, which is to be the working shaft when operations begin on a large scale, they went through 45 feet of cUnglomerate; and yet shallow shaft 50 feet distant was in ore at 10 feet of depth. The andesite is always absolutely barren. The work done by Messrs Massey, Smith and Kennedy has been excep tionally good. because they had the difficulty of reopeninf an old mins which had been idle many years: and also there was a difficulty in the fact that there might be truth in some Of the great many tales of rich shoots left to hold the ground" etc, and these must be investigated. But they have the whole matter well in hand now, and will doubtless bring the Mammoth to better days than it ever dreamed. The idea in mining is to leave pillars to hold the ground, using the caying system for material to be milled. There are areas fn the large mineralized zone that will run only Sl.50 (this is the least any of it does run), and it is the intention to leave this lowest grade to hold the ground, which is entirely feasible. By adopting the Chilean mills and the cyanide pro- cess better extraction may be made than with stamps and plates and low CT grade ore may be profitably hand led, especially if the tonnage is ma teriaily increased, which will be the case. The milling results at this time, however, are wonderful, considering the antiquaJed equipment and that the ore is really not properly amenable to the stamps.