Arizona republican., 1916-11-23
LEGEND OF THE DISTRICT THAT
 MADE FINAL
(Continued from pnre rmol

" Nu'itilutu run luSe IWOD
 or the ore-bearng ground so far as it IS vet known or developed at the sur 1ace and near 1t. The portions removed consisted largely of rock. the porphry, so called, penetrated and scanned with inter r-iaclnS veinlets of quartz, reticu-
 atihS and crossing in every direction these Vonlets varied from the thick ness of sheet of paper to one quar- ter or an inch or an inch in thick ness, and were generally accompanied by ore in medial position having quartz on each side of it next to the rock.
 The same conditions may be seen in the lower levels at the present time. In addition to these veinlets there are masses and punches of ore. and ap- parently Cat least in the upper levels) l central mass of quartz, d large and compact body towards which the sys- tenn of veinlets converged. or from which they may be said to radiatc. This mass of quartz, or irregular di- mersicn still exists in the region opened by the lowest levels of the mine but it has not been thoroughly explored This quartz appears tO hold some direct relation to the deposition of the ore; the heavier bodies of ore so far, having been cut below or on the foot-wan side of the quartz body It may be regarded as holding the relation of the chief veinstone to the ore, and as presenting within itself and together with the branching Veinlets, the character of true Assure filling. although it has not the usual sheet-like or tabular form IL Is, instead. Solumnar or chimney-like mass some eighty feet in diameter in places. but irregular and without lOngi- tudinal extension. In other words. this quartz vein, instead of forming a sheet like mass, or filling between parallel walls, with length much greater than its breadth. is approximately cylindrical columnar in it's form. filling a nearly vertical. spirally- formed cavity. as if it had risen as smoke rises in a chimney. but circling about through the rivcn rocks until 1t reached the surface by many outlets
 Without here discussing tho various theroies which might he advanced to account for this peculiar impregnation of the rocks with rich ores Of silver: whether the flow was from above down. ward or the reverse. whether the quartz with the associated metals was eNtruded from the surrounding rock and found Judgment by replacement. " gases. prefer to adop; the explanation that there was an upward flow of heat ed water and steam which carried the metals into the Assures and left them there. The conditions as we find them are most clearly explained upon this hypothesis. and believe are most viV- idly and truthfully represented to the mind by this conception of an upward flow of thermal water along main central channel. like that of deep seated spring or geyser, now an extinct argentiferous solfat ara
 If we examine the structure of the veinlets in detail we find them present ing the characteristics of Assure veins. They extend for long distances through the rocks and with parallel walls They have regular veinstone and vein struct- ure. The quartz forms on the opposite walls of the Assures in regular sheets with combs" of quartz crystals point ing inwards and holding the ore in punches and sheets. Such inclusions of ore are still to be seen In the' small veins al the summit of the cropplngs and in the levels below
 Some of .1e various forms under which the ores present thens eyes in the mine are as follows:
 I. Porphyry.
 ,. CCmpact quartz.
 2. White crystalline quartz