The Arizona sentinel., 1901-01-02
LA rORTuSA NuSE.

In the early days of gold discovery of Califor- mia, lS4s, when the news reached the gold miners of Sonora, there was a general exodus of the able-bodied men who were able to get away northwest to the new Fl Dorado in California, and the state of Sonora contributed many men to the mining population. They took the old road, which was known as the ''camino real, '' from EStancia and Altar northwestward, nearly parallel to the gulf, following the mountain ridge known as the Gila range. just north of our present boundary. The road led to Yuma, and in passing the Gila range they went within a few feet or yards of very modest outcrop of quartz which no one seemed to consider of sui fcient value to merit any attention That hum ble and insignificant quartz outcrop is today the outerop of the great Fortuna mine.
 It is situated on the westward slope and nearly 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 Gila river at the point now known as Blaisdcl The railway in its course to Yuma passes around the northwest point of this range Where the rocks are exposed at that point they are mostly of homogeneous granite, of gray color and weathered out at the surfaces which, however, are much pitted as if by decomposi-
 
 low-lying hills of granite there are big outcrops of rock which to the experienced eye indicate stratified formations. They are indeed strait fed, for the bulk of the range southward and southcastward is composed of regular stratifed, lsTinated, hard greiSSic rock. 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 mica clatpC ar6 hor poiations of quartzite beds, especially in the upper part Of the series, with green stains SUD- posed to be stains of copper and decomposition of copper ore, which they probably are, all though there are peculiarities of color, and some yellow COlors which indicate to ne the presence of some other mineral possibly, tel lurium, which by its 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 have been carried on here have developed a condition of things which could not be foretold from an inspection Of the outcrop. The vein 0r iode 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 its con- tinued 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 paid from the surface. The product or ere extracted up to the time has been about 80 tons per day, which is sent to the 2O-stamp mill. each stamp of which crushes about tons in every twenty-four hours The extraction is chiefly and largely by power drills. force of 80 men is employed by this mine and mill The greater part of the labor underground and mining is done by compressed air The lode, I was told, was 6 to 15 feet wide. This large space permits the use of power drills to great advantage. In the material hoisted there are fragments of the wallroc1S, some of which are thrown out 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- pcnse than it does to mill it, and there is a chance of some of it containing gold. From these 80 tons of rock crushed daily the average product is perhaps S4SOOO worth of gold per month. Some months they have produced as high as So0, 900.
 h the region of the Fortuna mine the forma- tions appear to be wholly of mica slate and bocablende slate. with some arenaceous layers Ike old mica ceous sandstoneS and quartzites The mine iS surrounded by black hornblendic states and mica states. dipping southward and southweStward at an angle of about 45 degrees and these states are very evenly lamnated r.,!.@ af.er ri&ee. Th:> ] apparently con