Bisbee daily review., 1911-08-27

D. c. Jackling. now recognized as a
 chief Of ;he porphyry-copper opera
 tors. is general manager Of the Ray Consolidated David Cole, formerly
 at the head of affairs at Cananea. and
 one of the most efficient all-'round
 mining and reduction men. is man
 ager. Louis Gates. who had charge
 for many years of the Boston Consoli-
 dated. is nine superintendent, W. S.
 Boyd. whd was with Mir Gates in
 Utah, is assistant: R. c. Rowland
 who for many years has represented
 Henry Krumb. and who had charge Of
 all the sampling and assaying at Ray
 during the churn drilling period. is chief engineer: George c. Bradley IS
 superintendent of construction; A. J.
 Mclean, cashier; J. H. Brown, pur-
 chasing agent: F. J. Franklin is gen
 eral superintendent of power plants
 for the Ray and affiliated companies.
 Hayden is headquarters for the Ray c Consolidated.
 The determination of the value Of the holding was the work primarily of
 the churn drills. of which 13 were employed. some Stars and some Key stones. Drill holes were made on the corners Of 20O-foot blocks, and 363 holes were drilled. Starting with an S1-4 casing, it tapered first to 6 If and then to 4 II. In sampling. every precaution was made to secure exact ness. Every feet each hole was completely cleaned and the sludge sampled, passing through an automa- tic sampler invented by Mir. Rowland. To check the work of the local chem ist a composite sample was taken, 20 samples from every 100 feet; these thoroughly mixed, reduced to proper size. and assay samples sent to out side chemists. In the underground development and exploitation over 1000 feet of drillholes have been checked, giving the most wonderful results. The first checking under ground was accomplished by driving to and under a drill hole. raising on the hole. taking out only half; when hand samples were taken every five feet to correspond with the samples during drilling. The results of a com parison of the two checked within a small fraction of a per cent. In the churn drilling a gTF.b sample was taken from the top of the tub of sludge and sampled at once, to give constant knowledge of what the hole was doing: balance of sample sacked, sealed, labeled and sent to the labo- ratory for assay. The regular sam pie for five feet weighed about 60 pounds. Some 25 miles of road was necessary for the transport of the drill machines to the different portions of the property, but much of this con sisted only of cutting out underbrush and rolling away boulders. Water lines to the drills were of 1-inch and were laid on the surface. The drill ing and sampling was done on the most elaborate and careful scale, and this, with the results positive by uH- derground development, made it feas- ible to go ahead on the large scale the company has adopted for the min ing and reduction of the ore.
 The ore body is in Pinal schist as a rule, disseminated. The schist has been fractured by many faults, and first diabese and then granite-poTphy- " were intruded, these making the ore Outside the belt, on the north, is the Pinal schist, unmineralized; on the south, some schist and some gran. ite rocks: on the east, sedimentaries, which are intruded by different erup- tives; on the west, schist and some eruptiyes. The ore body is at quite a uniform elevation, lying, flat Some of the drillholes found ore in the eastern section at 100 feet of depth and in the western section sometimes 450 feet of capping would be drilled before the ore was reached; the differ ence being due 10 the fact that in the western section the general elevation is greater than in the eastern, while the ore body lies at the same elevation in each district. The greater bulk of the ore is copper disseminated in Pinal schist, generally in the form of ohalcocite or copper accompanied by cupriferous pyrite. Locally, there has been found but little cuprite or native copper. and practically no carbonate or silicate. The capping even is prac- tically free from carbonates. The line of demarcation between the ore and the capping is very abrupt. In drilling they often broke through from oxidized material having no value and within five feet found good ore. A few acres of good ore have been found in the No. ] mine in a laccolith of granite porphyry. The laccolith is entirely surrounded by ore-bearing schist. Considerably smaller areas of diabase in the form of dykes have also been found to contain good ore. The highest point of drilling so far was near the crest of Humboldt hill, where 450 feet of capping was pierc- ed. Under this hill is an ore body of approximately LOGO, 900 tons to the acre. The mineral belt ig easily traceable on the surface, due to its highly mineralized coloring; namely. the red stain of hematite. together with the kaolin and the siricite, both of which are the results of the deeom- position of the muscovite mica. The mineralized belt diners. too, from the non-mineralized in that the latter i5 a dark-grayish rock much harder and more compact than the former.
 Operations will be through working openings in what are called the No. and the No. 2 mines. At each of these