Bisbee daily review., 1914-03-01

NldlHlS Atlus ut fuuAn uiAAlE UOlth holes at the intersections on every 200 feet, as was done at Miami, Live Oak, New Cornelia and other pros poets. and in this way a great ore tonnage was located.
 Mllions of Tons oi ore Proved.
 In the foregoing way an ore ton mage aggregating SO.000.000 at the present time. and increasing as the grade Is lowered from the original bas- is of estimate, has been shown. This ore body has a lateral area of about 7.200x2 900 feet, and an average thick ness of about 90 to 100 feet. In spots the capping is several hundred feet thick. IL is a big disseminated ore body the result of teaching from the upper, leaner area and deposition of an enriched chalcocite. At least three-fourths of this ore is contained in schist.-- A considerable portion of the ore body lies above the level ol the gulch through which Mineral Creek runs, the ore being brought out through an adit level, and it lies most advantageously for mining although all the ore is secured from under ground operations, no steam shoveling being attempted.
 How the Deposit Is Attacked.
 The editor of Iron Ore was much interested in the plan here observed for winning the product, it being a lit tie different from that employed at any other property we have visited.
 There are three shafts leading from surface to and through the depth Of the deposit. Two of these are located at or near the ends of the deposit and one nearly midway on 1t. The central shaft operations differ from those at the ends. due to the fact that the wa ters of Mineral Creek flow over the ore deposit. and the attempt is being made at maintaining the surface by the old square set plan of timbering. In time the inefiiciency of this will be demonstrated, as we have yet to see surface that can be indefinitely main tained by this system. Some other and more certain plan for combating the water will later be adopted we are certain. It is now probably filling temporary condition.
 The Stope Shrnkase System.
 At the shafts on' the extremeties of the ore deposit the product is ob tained by what the Lake Superior min |, CT knows as back stoping.' but there are certain features here the Lake 8 Superiorite would not recognize. IT egect the work Is conducted as fol lows: In the first place there arc . three motor levels at the two cavinl plan shafts. A main drift is run ou from the hoisting shaft, being located as close to the outer edge of the or' deposit as is possible Al spaces O every fifty feet parallel side drifts ar' located, these running entirely througl the ore body to what the miners herr call fringe" drift. this running par allel to the main haulage drift. Her then we have a drift on each side o the ore body with parallel drift every fifty feet cutting the ore bod e up The object of this is to get a the ore everywhere so as to weaker . it throughout on this level, permittin
 if to come down as we will describe g Safe Manway Raises in Country Roc
 At some point along the main drii !. manway raises. called "permanen raises" are put in, which affords saf way for men to reach sub-leyels whic
 are nut in at about 20 feet above tn
 motor floor These raises are d ylded. one side being for the passin of men, the other for timber ana sue
 materials as are needed in the mi' ing. They are cribbed and made sat'
 The Parallel Drifts.
 The parallel drifts before mel
 toned are made secure with l2xi inch timber sets on hye'foot centre and have. when in place clearanc of feet bv ' feet inches surmonn
 ing the drift sets, which lie whhi
 the ore body at intervals of twent