Bisbee daily review., 1908-01-26
P|LARES MINE GETS 4 VIVID
 DESCRIPTION
Said To Contain the Second Largest Ore Body In the WorId-Method Of 0perat- ing Unusual.

The Pilares Mine, six miles south.
 east of Nacozari Sonora, owned by
 the Moctszuma Copper Company. has
 been pronounced by comOetept su-
 thoTity, the largest continuous ore
 body in ,lre world as yet discovered. 1 w.;h the possible exception of the
 RIO into. This assertion of course, contemplates copper propositicnG. 1 The Rio Tinto has been worked for | 3,400 years. and is still heavy pro
 ducer The leading copper mines of Arizona and Mexico have as a rule
 enjoyed an advantage over the ] Pirares in the matter of modern appIi- | ances in operation before the Mocta- zuma Copper Company, the present
 owners Of the Pilares came into possession of the property and in- stalled the latest and most approved systems of development and mining Development however under the present management has been rapid. l and greater gains are made perhaps. day by day in the reliable estimate or its resources than can be recorded ln the history of any proposition of a Kindred character on. the conti- nent
 Compared with the 15O miles of level work in the Copper Queen at B1sbee, the Pilares has approximately hfty, yet that work, along with the necessary vertical development anc diamond drill explorations, has de- Yeloped according to the statement Of one of the ablest engineers in the united States, ore bodies, aggregat- Ing in values the enormous sum of seYanty'fiye million dollars, with copper at 15 cents, the ore carving an average of 3 and 1-2 per cent
 These are tremendous figures in connection with a property only TOO feet deep in the matter of develop ment and which has not been the subject of systematic development over fourteen years.
 To the average observer, surface conditions on the Pilares, would be, to say the least distinctly pninvitng- Now that the property has proven so much for itself. all the wise ones can discover multitude of pregnant indications on the surface, but the diccoyerer himself, who received two hundred and fifty dollars for the leading share, did not, and Riedaras~ who operated a little dinkie smelter- on the first ore that came from it, did not, and the Mighty Guggenheim- CTS who sold this their birth right for mess of pottage," with all their high priced engineers and infallible- discernment, discovered no ear marks. of greatness in the Pilares, evens after years of desultory exploration.
 But, after all the noise about "con- tacts" and trends" and dykes and formations, with which individuals fool the average investor, copper is, like gold, where you find it.
 The surface of the Pilares is what was known, before it became a great mine as conglomerate, the most dis heartening proposition on the geo logical map, but now that it is known to be big one" they call it ''brec- ria you known"
 Now the mine is worked exclusive ly on ths ssyel plan with the neces- e sary raiSa3, shafts, schutes and manwayS D supply ventilation, carry supplies aa to accommodate the handling G, ore and kindred utilities The mai camp is on top and besides two shafts, there is an incline and gravity tramway from the bottom known as Por Venir to the top level All the ore that is hoisted is employed to operate the gravity train.
 The lowest level is on the 700 and is distinguished for the presence of large tunnel exactly one mile ia length, at the end of which vertical shaft is in commission.
 The narrow guage ore trains, con sisting of steel cars to a capacity S 25 tons each are handled by locomo- tives between the mine and Naeozarf, but when they arrive at the mine they are turned over to motor and run into the tunnel and rapidly filed from score of schutes coming from the stopes and levels above, taken out and turned over to the locomotive.
 The ores in the Pilares as a gen eral proposition are what are known as chalcopyrite, variety Of copper ore that runs from a trace to 3096, or peacock copper which is frequently the case in this instance, may run much higher.
 The average over the whole mine has been a fraction better than 3 and 1-2%6, though train loads could be sorted up to 25% and higher, and the ore is finely adapted to concen- trating.
 m many pldccS tue OES OSCuIS III such heavy form that it is unavail able for concentrating and in such instances is very ricA and is shipped to the smelter raw"
 The extent Of the mine cannot bs' defined, but so far as developed, II contains ore, practically nothing hut o-e, running very low grade in places. yet walked for miles through tunnels and drifts. where the candle light re- flected from sparkling sulphides con tinuously.
 METHOD OF OPERATING
 The method of working the fiiares constitutes one of Inc most rensaIk- able subjects in the history of cop per mining. In the first place, the mine is as dry as cSip.
 The ground is well adapted to sus- taining itself The tunnels are, of course, run with ease. and timbers are unknown except in few places where seapage occurs
 The stoping system Is the crown
 f0<~fsnrod on poOa Ten