The Tombstone epitaph., 1882-03-27
E Six-Page Edition.
This Page is from the Daily
 of Friday, March "A.
PROFESSOR w. P. BLAKE ON THE
 TOMBsTONE MINES.

membered by the readers of the EP. irApH as one of the experts in the Contention. Head Center case, tried at the last term of the district court in Tombstone. He is celebrated throughout the United States as a learned mineralogist, therefore any thing that he writes upon that sub jeot is sought by those interested in the subject of mines or mining. He published in the Mining and Ergi- neering Journal, of March IS, an elaborate article on "The Geology and Veins of Tombstone, Arizona" the paper having been read before the American Institute of Mining Engineers at it's last meeting. We reproduce such portions of the arti- cle as we deem of most general in- terest. He says:
 In the central portion of the dis trict, covering the claims known as the Tough Nut, Good Enough, Way Up, Vizina and others, erosion has exposed the outcropping edges of many strata of limestone, shales and laartzites." Both the shals and so- ed qusrtzite beds are of deep sea
 in, being very fine and compact { texture, with scarcely any signs of
 hular structure. The latter, par
 larly, is flintlike and very hard,
 is more exactly described as a
 aculite or honestone. In places,
 asses insensibly into limestone,
 arently forming beds of silic,ous
 estone. It is, no doubt, largely
 anic in its origin, and is a very
 sediment, totally different from
 typical quartzites, with granular Fucture, found in the higher parts
 the series of strata. It evidently, 1N Forming, accumulated slowly, be- yond the influence of currents at the sea bottom. An abundance of iron pyrites in fine crystalline grams, dis seminated through the layers of this rock, gives evidence of its organic origin in part, at least. This rock has special importance from the fact that miners in the Tough Nut and Good Enough claims find it below the chief ore-bearing limestoneT It is regularly and evenly strati6ed for thickness of about 140 feet, and rests upon thickly bedded dolomi- tIc limestone below. The beds above it consist of dark, black or blue limestones, and thick beds of dark argillaceous shale, alternating with black silicious shales for nearly half a mile to the eastward. The black limestones above the novaculite are the chief repositories of the bedded masses of rich silver ore, as will be presently shown.
 The whole series of beds in this central part of the district is thrown into folds, being regularly plicated in 2 series of wave. like flexures, the steepest and sharpest folds being on the northwest of the Tough Nut and Good Enough claims facing the granite region in that direction. These folds may be traced, but with difficulty, on the surface, but are best seen in the crosscuts of the mines along the drifts. In the open cut upon the Tough Nut there is 8 good exposure of some of the beds at the crest of an anticlinal fold. It is directly below this place on the surface where ore was found crop. ping out, mixed with soil and vein stutt. At another place, upon the western end of the Good Enough, we find series of plioations up and down at about the angles shown, (re- ferring to diagram) and with rich ore lying in the folds. These folds are not large, covering only a few hundred feet in extent, but are beau- tifully regular and we'll defined. As we pass up the hill, rising higher in the series of strata to the eastward, the dip becomes more regular, and coarse grained quartzites, in thicker beds, take the place of the finer grained deposits.
 All of the formations named have not only been uplifted as described, but have been much broken and faulted, either at the time of uplift or at long periods later. This IS shown by the number of Assures and lines of fault, as we'll as by the out crop of dikes of porphyry, and the dissimilarity of the strati6ed beds on each side of them, and the disiointed outcrops of the limestone beds.
 The chiet Assure and bearing vein of the district traverses the Grand Central and the Contention claims. These claims are located in a north and south direction upon the somewhat obscure oroppings of dike of diorltio porphyry carrying orc in, through, and alongside of it. This location was made by Messrs. White and Parsons. The croppings were not remarkably we'll defnea, consisting of the porphyry and confused mixture of porphyry, chert, ard quartz, with masses of porous quartzite alongside; none of these =. ~L L.