Bisbee daily review., 1913-01-29
CLAIMING SAYS ORE GOES ID GREATER
 DEPTH MIAMI MINE
Recent Diamond Drill Holes Show Ore Body Extends in Places Two Hundred Feet Below Development
BOTTOM HAS NOT
 YET BEEN REACHED

 Copper company. has written the fol lowing concerning ths property of that company for the Engineering ana Mining Journal:
 In 1912 the development of the Mi ami ore body for mining was eNten- sively carried forward by extending fhe extraction drifts on the 420-foot level so as to undercut the main orc body on that level. and also to get underneath the Captain ore body and to connect with the Captain shaft The development Of the 570-foot level was extensive so as to pTe pare this level for an extraction level. It is be ing cut up in the same rectangular eTidir0n fashion as the 420foot level, and is so arranged that when the hnal method of mining is determined upon, it will be available for any method selected The third extraction lever was arranged for in the main shaft at 8 depth of T20 feet, bur nothing has been done at this point 9s ii may be advantageous to put this level to still greater depth. repending upon the ore development
 Of the ore mined in 1912 a largo
 
 work and from the square sets and slicing The shrinkage stopes which have been tried out on The t20-foot level are nearly all in shape. but the work ot cutting out with square sets above them and tine intervening pill lars was not completed. The indica- tions so far are that this method of combined shrinEage stopes and pil ial slicing will prove to be econom- ical both as regards percentage of ex- traction and cost
 The early estimates of ore reserve assumed the ore 10 extend TO a depth of only 90 feet below the 570-fCOt leF- el. During the latter part Of 1912 eight diamond drill holes were put down from the 570 foot level showing that the ore extends in places from loo to 200 feet below that level. and in some places the bottom was not reached. The indications are that the ore will go to a much greater depth than was expected, followin. along the line of the Gila conglomerate fault. The results Of 1912 show a material increase in the ore in sight together with excellent prospects sfor continuation in depth.
 In January. 1912. the mill was treat. ing al the rate of 22e0 tons per day, and since June l, at the rate of nearly 5000 tons per day. The approximate production for the year was 32, ,0O0. .00U pounds of refined copper. The years work in the mill demonstrated the increased efficiency of the Hardinge pebble mills over the Chile mills. and orders have been placed for the liar dinge pebble mills to replace the Chile mills as they are worn out An extremely heavy type of intermediate AlxIC-in. roll developed by the Trayloi Engineering and Manufacturing com pany. are being introduced, one at a time, in each section of the mill In addition to this experiments indicated the desirability a certain amount of mineral which is at present lost in the sand tailings, and these improve. ments will gradually be installed dur ing 1913. The indications are that with these betteTments the capacity of the present mill can be materially increased over its present limit of 2,G00 tons Der day
 In the power house the sraces left for new machinery were filled by the installation of a 690-horse power boil e.. 1000 cubic foot air compressor. a 125O-kw. generating set, and a sec. ond condenser A second 400-horse power synchronous motor was in- stalled at the BuTch pump station thus giving the pumping plant with its two pumps a capacity Of 2400 gal Ions of water per minute 4 tailing elevator was installed below the mill raising the tailing to a height of 7J feet and permitting of its discharge in the second gulch below the mill On the surface, a number of houses where built and hospital. jointly owned by the Miami and the Inspira- ton. Is now being created Th> work for the year progressed smoothly and the prospects. as above stated. for increased ore reserves and an in- creased tonnage by the miB are most excellent.
 o. D. CONSTRUCTION
 The completion of the new 5OO-ton concentrator Of the c. D. depcnds largely on when the shipments oi steel come through from the east. but if there should be no delay the con centrator should be running in the late fall of this year.
 The excavation for the nev crush CT plant is completed ard the forms are in place for the concrete. Excaya- ton work is proceeding at the site Of the sampling mill and concrete ore bins. The foundation for the new Nordgord compound geared hoist st the "A" shafi was completed early this month and is ready for the hoist which has been delayed in shipment PILES CURED IN 6 TO 14 DAYS.