Arizona weekly enterprise., 1888-03-17

around and beyond the old por2hyrtic ore body on its north side, and lying ln conformity with the axis of the upper levels It Is proposed to explore this ground during the year.
 There has been no work done on the 400 level during the year, but on the cessation of operations there a little over year ago, some ore supposed to be linn tied in extent was left in place on the sill floor, it having been discovery made by stoping out the 800 level below, and lying outside the limits of the origi- nal 400 level sill which was abandoned some years ago with the belief that 1t was exhausted. The ore in question is DOT phyritie and IS high grade, with native silver, galena and fahiore as the prlncl- pal silver constituents.
 The 800 level reported to you year ago as being exhausted, but Ill removing the last of the ore from the east side of the top of the 600 level during the year past, we have followed number of rich seams of the same material as l have mentioned as being on the sill of the 400 level, that are running up outside the east limit of the sill floor of the 300 level, as it was left. This oFe will be removed the coming year.
 During the first half of the past year, the 600 level was vigorously operated for the extraction of the remaining ore OH the eighth, ninth, tenth and eleventh floors, but the work WAS temporarily sus- pended before the extraction had beeR completed, leaving small quantity of ore on the eleventh floor yet to be re- moved The volume of the ground ex- tracted was IT 112 cubic feet.
 The 700 level having been exhausted some two years ago, excepting small block of ground in close proximity to the shaft, which the security of the shaft re- quired to be left intact, has remained un- disturbed since that time.
 The 800 level has furnished the chiet supply of ore during the year, and has been most energetically operated. The sill floor was extended on the west side about twenty feet, and the north breast was extended ten feet, the full width of the level The present extreme dinen- sions are sixty-hve feet by one hundred and fifteen feet A prospect tunnel was run from the center of the west breast in southerly direction a distance Of forty-hve feet, intersecting several mar row seams of ore that assayed 50 ozs silver per ton and upwards This tun- nel is entirely Tn porphyry ground, and has been left for future development Another prospect tunnel was run from the northwest corner of the sill floor in a westerly direction, distance of eighty five feet. and crossed a body of quartz which carried some little mineral, but not of an encouraging character. An In- cline winze has been run from the center of the north breast of the sixth floor of the level. to the north end of the old sill floor of the 700 level, Interesting at that point the main vertical wlnze be- tween the two levels, aud providing an improved ventilation, and a meaus for handling waste ock or other material. It is one hundred and forty eight feet long, and will be provided with car to be operated by power. The ore body of this level has beeu pretty well extracted up to the sixth floor, the present work be- ing confined to the sixth and seventh floors. Two hundred and eighty seven thousand, four hundred and sixty-nine cubic feet of ground were extracted dur ing the year.
 The connection of the main workings of the mine with Shaft No. 2 (bilk shaft, was accomplished during the spring and summer, by sinking a continuation oi the main vertical winze of the 800 level to depth of one hundred and sixty foul feet below the sill floor of that level, and meeting the main drift from the 9oC level of Shaft No 2. The winze is therefore two hundred and sixty-six feet deep below the 700 level and is timbered throughout, the portion sunk the past year being in two compartments, eacl three feet square in the clear-ont a hoist way, and the other a ladderway tc offer an additional exit from the mine, ,anc to carry water pipe to convey tn, drainage from the main workings tC ] Shaft No. ?, at which point all the watel of the mine will be collected and handled | by the Cornish pump mentioned Tn my | last report. On the sill floor of tue 8O( l level, at the west side of the winze, | station was excavatgd and timbered, ant a new ." x12' single drum-geared hoist ing engine, furnished by the Union Irol Works, $. F., was placed in position tt assist in sinking. the winze, and furnisl power in the future for a variety 0 operations ill that part of the mine. Tn engine Is run by compressed air.
 When the before mentioned connec tion was made i'll early June, the venti lation of the mine was completely chang ed and is now highly satisfactory, reme dying a trouble which caused much em barrassment during the warm month for several years past. Shaft No. , now the down cast airway. On June 19t the drainage of our main workings wa diverted to this shaft, and has since bee handled through it thus relieving tn main (King) shaft, already over-crowde with work, of considerable duty. Tn main drift at the $50 level of Shaft NJ 2 is three hundred and forty feet long and during the year the station wa retimbered, the drift strengthened, grad ed for proper drainage to the shaft, tim bered where weak ground existed and
 track laid for three hundred and tiv feet of its length, leaving thirty five fee to be shortly remodelled.
 In conformity with my purpose sus gested in my last report, of providing
 means of operating the large ore bod lying above the sill floor of the 20 level, independently of the main shaf by making the requisite connections wit Shaft No 3 North King, this shaft h;
 been su bstantially retimbered for twent.
 three feet below its collar, landir station has been constructed at the sout
 end ten and One-half feet below the co