Bisbee daily review., 1904-06-09
lUarren nlinin9D District

ly of cuprite in a gangue Of oxides and quartz. Masses of malachite and chrysosolla are intermixed with this ore, and in some parts of the mine there are large bodies of specular hematite carrying only a small per centage of ore.
 The occurrence of sulphides. which is essential to the successful issue of the present scheme of metallurgi- cal treatment, has been established by exploration of the lower workings. These ores begin to appear on the fifth level at a depth of $50 feet and on the eleventh and twelfth levels they are in force. Pyrite and chal- cocite and the most prominent min erals in the latter, as might be ex- pected, being found in the transition zone below the oxides where it has probably been deposited by process of secondary concentration. The pyrite occurs in a different type of de- posits than the oxidized ores above. It is confined mostly to irregular veins in diabase which form two well de fined lodes. The gangue is mostly quartz Of friable nature. Very lit tie chalcopyrite can be observed with the pyrite, but no doubt it is present tenor or the pyritic ores usually ex- ceeds 3 per cent; portion can be smelted directly and the remainder is well adapted to concentration.
 In carrying out its new plan of de velopment the company has provid- ed for a more active campaign than was possible under former conditions. The old shaft near the south end of the workings was partially disabled by movements of the ground due to caving, and hence could not be re- lied upon to furnish the necessary capacity for hosting when work was under full headwoy. As a substi- ute. new shaft has been driven to point further north and on the foot wall where there is no danger of sub sidence It is a vertical ive-compart- ment shaft, measuring If by 6 feet in section, and has a steel head frame 75 feet high. The hoist is a direct-acting Nordburg. 20 by 50 in- ches, equipped with steam brakes and steam reversing motion. The shaft is down to the tenth level and will soon be in contamination with the twelfth, now the bottom level.
 4 small flow of water has to be handled in the mines. but this will eventually prove an advantage rather than otherwise, as it can be used in the mill which is 10 be added to the company's plant. Most of the water enters on the ninth level. and a sin gle pumping plant which is to be in- stalled on the level below will dispose of the entire flow.
 While the new smeiter is under con struction the old plant has been press ed into service, and two furnaces are now making Bessemer matte which is converted in temporary stand The ore is obtained from the Old Domin- ion and United Globe mines, but al though two carloads are exchanged daily with the same quantity of Cop per Queen, ores which are needed for their iron adn sulpdur The ne cessity for this arrangement will cease when the company begins concentrat- ing it's sulphides.
 The smelting works are being erect ed in proximity to the old plant, some distance south of the main shaft. with which they are connected by railway. The main building is of steel con struction. measuring I15 feet long by thirty feet wide, with bullion and re lining shed attached, of the same length. l. is to be equipped with three furnaces, A by 1S0 inches at tuyeres, and two stands of converters. The i furnaces are arranged tandem with settlers between and can be tapped from either side. so as to run the matte from two furnaces into one l settler. They will be charged auto maically from the cars. A 40-ton ' treveling crane has been set up for | handling the conyerters. The dust in the rear of the furnace building is of steel and brick construction, de- signed to handle easily 50,000 cubic | fee: of free aiv per minute.
 The increased demands for power have neceisitated the erection Of a new steel power house near the smelt- CT; it will supply about HOO horse