The Arizona sentinel., 1901-11-13

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 ridge kICW1i 1S -4t- 1,s-,. & S, ..... .l ,.. (, present boundary. nc road icG so a'un1a a9 in passing the Ci3a range ohcy wenG within few feet or yards of q very modest outcrop of quartz which no enc seemed to consider of sur hclent value to merit any attention. That hum pie ana lnSlgnlncant 9uartz outcrop is today the outcrop of the great Fortuna mine
 It is situated on the westward Slope and nearlv at the base of the range of mountains called on some of the old maps the Gila range This trends northwesterly and reaches nearly to the SIila river at the point now known as Blaisdell The railway in its course to Yuma masses around the northwest point Of this range Where the rocks are exposed e. that point they are mostly Jl lCmgpGE@grS grnrlta of e,1a- color and wea Gbered out at the surfaces Tbier however, are much pitted as if by deeon:yGsi- t1on of some soft substance. But beyond these loW-lylng hills of granite there are big outcroDs of rock which to the experienced eve indicate stratlfied formations. They are indeed strait lied, for the bulk of the range SouthWard and BoutheaStward is composed of regular stratifcd laminated, hard gneiSsic rock. use the word 'gneisslc" in very general and comprehensive much more accuracy if you localize them as mica states and hornblendic states with inter polatlons Of quartZite beds, especially in the upper part oI the series with green stains, sup posed to be stains of copper and decomposition Of copper ore, which they probably are al though there are peculiaritieS of color and some yellow colors, which indicate to me the presence or some other mineral. possibly tel iurlum, which by its decomposition has given these colorS. The fact remains however that the bulllon from the upper part of the vein con- talnS more copper than 1t now contains in the lower levels of the mine. The workings which nave been carried on here have developed a condition of things which could not be foretold from an inspection of the outcTop The vein or lode appears to be chimney not a contino- ous ore body, nor a continuous vein with an ore body or chimney or chute upon it. AS re- marked the outcropping points indicate that this ore body.
 The vein is remarkable first in this limited out- crop; second, in its continuity in depth it's con- tlnued satisfactory richness, and the 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 ere extracted up to the time has been about 50 tons per day. which is sent to the 20-Stamp mill each stamp of which cruSheS about tons in every twentyfour hours. The extraction is chiefly and largely by power drills. A force of so men is employed by this mine and mill The greater part of the labor underground and mining is done by compressed air. The lode. was told, was to Is feet wide. This large space permits the use of power drills to great advantage. In the material hoistcd there arc fragments of the wall rocks. some of which arc thrown out, but many pieces pass through the mill. They would prefer to reject most of this wall rock, but if would take more time and ex penSe than 1t does to mill it. and there is 2 chance of some of 1t containing gold. From these 80 tons of rock crushed daily the average product is perhaps S48,000 worth of gold per month. Some months they have produced a: high as S90000.
 1n the region of the Fortuna mine the forma tlonS appear to be wholly of mica slate anC hornbiende slate, with some arenaccous layer' Ike old micaceOCS S5ndStoneS and ouartZiteS The mine is surrounded by black hornblendi states and mica states dipping southwark ana Southwcstward at an angle of about 45 degrees and these states are very evenly laminated Il 1ge after ridge.