Daily Arizona silver belt., 1910-04-24
Ore Is Being Taken from Workings to Limit of
 Hoisting Capacity
WILL HAUL WITH
 ELECTRIC MOTORS
Additions to Pumping Plant Make It One of Finest
 in the Country

The present hoisting equipment at the Old Dominion mine is raising daily about 400 tons of concentrating ore, 300 tons of ore available for smelting and 300 tons of waste. Most of this ore is being taken at present from the stopes on the west side of the twelfth level, the east side of the fourteenth level and the intermediate level be tween the fourteenth and fifteenth The large body of ore encountered in the farthest western workings on the thirteenth level few weeks ago is also contributing largely to the smeltei supply. The ore being mined there at present runs from eighteen to twenty five per cent copper and of course brings the general percentage of the ore uI materially. Most of the high grade ore found in that part of the mine is mala chite and chrysOcolla. The ore between this level and the twelfth level above has been proven continuous and prepar. ations are now being made for stoping from the thirteenth level up to the twelfth. This important ore body was encountered nearly 1900 feet west of the main shaft, and with the exception of the workings on the twelfth level the thirteenth level drift is the farthest western underground extension of the mine.
 The Od Dominion Copper Mining X Smelling company has just received big chi tc of Sta ,,,t, ,l ating equipment for installation in the shelter power plant The management is now considering the installation of an electrical haulage system on the twelfth and fourteenth levels, on the east side of A shaft. In adding this improvement to the mine s mec hanica equipment, Edison storage battery mot ors will be used. These motors, in order to run for eight hours, must be charged for four hours.
 The advisability of adopting eectri cal haulage in the Old Dominion mine as long as it is in it's present condition IS open to question, as the drifts arc rather crooked and many of the tim bers have settled to such an extent as to offer possible interference with the operation of motor cars.
 Three of the large Nordberg pumps installed on the twelfth level of the old Dominion mine have been running for the past month, and the fourth pump now being installed, will be in work, ing order in a few weeks, although it may not be necessary to operate it. All the water from the upper levels of the mine is drained down the c shaft and runs into a large stump prepared for it on the twelfth level. The water from the thirteenth level is drained to the fourteenth and is pumped to the twelfth level by two Gould triplex electric pumps, running thirty-fve strokes to the minute and having a capacity of $50 gallons to the minute. These pumps are self-acting whenever the water in the stump reaches a certain height. On the sixteenth level, two more Gould trlplex electric pumps of the same de- sign and belt-driven, with capacity of 25O gallons a minute, pump the water from the sixteenth to the fourteenth level, from where the pumps on the fourteenth level raise it to the twelfth level stump. The electrical pumps on the fourteenth level are directly under the twelfth level pump station, and the water column passes up the shaft to the Nordberg pumping plant above Two other pumps are stationed on the six. teenth level in the winZe put down in block 6. These pumps are not situated directly under the others on the upper levels, but will eventually be moved and put in the station under the cleo ric pumps on the fourteenth level. When this change is effected, all the pumps on the various levels will be directly under each other and will pump up one main shaft, and the pu'mps on the six. teenth level will raise the water from that depth directly up to the twelfth level from where the NOrdbergs will carry it to. the surface. From the fore, going description it can be readily seen that the present pumping equipment at the Old Dominion mine is very complete and effective, so that any flow of water encountered there in the future should he easily cOped with
 With the extraction of ore to make up the shelter supply is being accomp lished at the usual rate, approximate ly 1000 feet of drifting and 600 feet of raising are done under contract fOl development purposes each month. The sinking of the Transit shaft to deptl of 400 feet has just been completed and the re-timbering has been finished under the direction of w. E. Carter who contracted to do the work.