The Arizona sentinel., 1902-01-01

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 Cf sonora. -1.
 aa-r-bo.i..l il"a s,.. -t~ -.s nogJh.- -' ..l. ;-.. ;y .-.-a--'-. and tae S-i os -jf5g-l ..t-- .t.4. 10 the min. 2 f-..-,..- -- road. which Wa. ss-
 from ESJaIcia plid -Al..i parallel to jhe @.. Fiigr kEora .s 's'
 ur,',cut .cJ
 in passing t:." ..ia
 few feet ur V5r;ss tI .. .... ..-t. quartz whic. To cit. S''-.". ., -.li-i.:'r .: >.. ficient value to Iaeri, ;l-lv 8 .'.-5,s s....5 nl be and insignificant quart )'.cgcp is tvtGy ... Outcrop of the great rOr5 .lIa ,riAs.
 It is situated on the west ward Sopa a;id leAri. at the base of the range Of mountains ca,ied o. some of the old maps the Gla range. his trends northwcStnrly and reaches n"a~Iv so h. Gila river at the point now known GS BidiSdol The railway in it's course to Yuma paSS"S around the north vest pOiat Gf this raIg. Where the rocks are exposed at that point they are mostly of homogeneous granite of gray color and weaIhere,i out at tho surfaces. which. however. are much pitt'j as If by d"conn0~i- ton of some soft SuOStaacn. B1t beyond these low-lyicg hills of granite thore a-n big outcropS of rock which to the experienced eye ildica,c stratified formations. They are indeed Stra:i- fled for ti1e bulk Of the range SouthWard and Suutheastward is composed Of regllar SUratifed. iaminated. hard gneissic rock. use the word ''cneiSSic in tI very general and comprehensive sense, for you can describe these rocks with much more accuracy if you locGlizc them as mica states and hOnblendic states with inter
 
 upper part of the series with green stains, SUD- poSed to be stains of copper and decomposition of copper ore, which they probably are. al- though there are pecTliaritinS Of color. and some yellow coloTS, which indicate to me the presence of some other mineral. possibly, tel iurium, which by it's decompoSition has given these colorS. The fact remains, however, that the bullion from the upper part Of the vein con tainS more copper than it now contains in the lower levels of the mine The workings which hava hpcn carried on here have developed a condition of things which could rot be fore;old from an inspection Of the outcgop. The vein or lode appears to be a chimney. not cOntlnO- 0uS ore body nor continuous vein with 9I ore body or chimney or chute upon it. As rn- marked the outcropping points indicate that there is no very great longitudinal extension Of this ore body
 The vein is remarkable first in this limited out crop; second. in its continuity in depth, it's COZ tinued satisfactory richness. and tho promise it gives of enrichment by further veins dipping into it on the foot-wall sides.
 Some facts in regard to the product or yield: The ore paid from the surface. The product or ore extracted up to the time has been about SJ pOnS per day, which iS sent to the 20-Stamp mill each stamp of which crUSheS about tons l every twenty-four hours The extraction IS chiefly and largely by power drills. A force of So men is employed ny this mine and mil The greater part of the labor underground and mining iS done by compressed air. Tho lode' was told. was to l5 fect wide. This large space permits the of power drills to greal advantage. In the material hoiSeed there arr Ol Nss-t IOShN SCtil'7 Ol NAI thrown out, but many pieces pass through th' mill. They would prefer to reject most of thl' wall rock but It would take moro time and eX penSe than it does to mill it. asd there iS chance Of some of it containing gold. From lh..Se go tolS of rock crushed daily the average product iS perhaps StS.000 worth of gold pc month. Some months they have produced a high a. 30.9O0.
 In the region of the Fortuna mine the forma tio1S appear to bn wholly of mica slate ap' hornblende slate with some arenaceOuS layer Ike old micIceo1s SlndStoncS and QuartZlteS The mine is surrounded by black hOrnblendi states and mica Slate>. dipping South|ard an sou5hweStsSard al an angie Of about i3 degree, and these states are very evenly iam1nateC ridge after ridge.