The Arizona sentinel., 1901-12-18
LI FORTUN VINE.
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 '"-bOdi"a r'sl Wbt gal. . .Jruh ,G.:- I'' r sfi t-.--!,.. ..ii,..s. and ;he >ti.yc u- sonora cyHlci9 9.s", i..,G le.. to the mining p0pl-&lIc.-. : hey lCuE the oii road which was i5aO Sn I- ;ac '-c.lililo real. from ESt2scia .iIg A' Jar L;5:t Invest yard near. r'3rIl-ei Oo the EGf. following the lnCa.l,ai-i 1.ige known the Gila range. jaSt nor.l of o.ir r0cSent boundary. The road les, 70 Tur1a aud Ia passing the Gila range they went n15nin .sg fe't or yards of very modest outaroD e quartz which no one seemed to consider oi SUI ticient value to merit any Gttel.iou. IhaI hum bic and insignificant quartz outcrop k today the outc-op of the great Fortuna mIa".
 IL is situated on the westward slope and nearI, at the base of the range of mountains caiIed on some of the old maps the Gila range This trends northweStorly and reaches nearly to the Gila river at the point now known as BlaiSdeI The railway in its course to Yuma passes aroand the northwest poiat of this range Where the rocks are exposed at that point they are mostly or homogeneous granite, of gray color anI weathe.ed out at the surfaces which. however, are much pitted as if by docompoSi- ion of Some soft substance. But beyond these -Jw-lying hills of granite there are big oulcropS Ot rock which to the experienced eye indicate straJified formations. They are indeed strait fed. for the bulk of the range SoUthyar5 and southeaStward is composed of regular stratifed. laIninated, hard gnelSStc rock. l use the word 'gneisSic'' in very general and comprehensive sense, for you can describe these rocks with much more accuracy if you localize them as
 
 poiations of quartZiJe beds, especially in the upper part of the series. with green stains Snp- posed to be stains of copper and decomposition or copper ore, which they probably are, aI- though there are peculiartieS of color and eome yellow colors, which indicate to me the sreSence Of some other mineral. possibly. tel isIrium, which by its decomposition has given these c61orS, The fact remains however that the bullion from the upper part of the vein con- tains more copper than it now contains ill thc lower levels of the mine. The workings which have been carried on here have deveIopod a condition of things which could not be fore old from an inspection of the outcrop The vein or lode appears to be chimney, not a continJ- ouS ore body, nor continuous vein with an ore body or chimney or chute upon it. As re- marked the outcropping points indicate that there Is no very great longitudinal extension Of this ore body.
 The vein is remark ole first in this limited out. crop; second, h its continuity in depth it's con- tinued satisfactory richness and the promise it gives of enrichment by further veins dipping into it on the foct-wau 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 S0 tons per day, which Is sent to the 21Stamp mill. each stamp of which crushes about tons in every twenty-four hours The extraction k chiefly and largely by power drills. A force or 50 men IS employed by this mine and mill The greater part of the labor undergrOund and mining k done by compressed air. The lode. was told, was to l5 feet wide. This large space permits the use of power drills to great tuNanSdSN% Tn the material holSted therC aye Fragments of the wall rocks, some of which are thrown It, but many pieces pass through the mill They would prefer to reject most of this wall rock. but it would take more time and ex- penSe than it does to mill it. and there k q chance of some of it containing gold From these 50 tons Of rock crushed daily the average product is perhaps S4S00 worth Of gold per month. Some months they have produced as high aS s5U,'JU
 In the region of the Fortuna mine the forma- Co IS appear to be wholly of mica slate and ho-nbende slate, with some arenaceOuS layerS lHe old micaccOuS SandSt0neS and quaTtziteS. The mine is surrounded by black hornblendic states gnd mica slaTteS dipping sOuthward and southwestvard at an angle Of about i5 degrees. and these states are very evenly laminated. ridge after ridge