Arizona republican., 1916-11-23
APPROPRIATION | IF 0RE BODIES
 0F THE REC|0N

Extending in a curve from Hay den
 Arizona, to Superior, Arizona, is a
 mountain range whose formation con
 sists partially of sedimentaries. The
 lower one is quartZite of unknown
 thickness. On tnis quartzite, resting
 comformably, is a series of limestone
 of about 600 feet vertical measure In
 places the full measure of limestone is
 left at others they have been base
 leveled, leaving only detached frag-
 ments. Where the heavy measures of
 limestone remain are found the mines
 Among these mines may be mentioned
 The Christmas, London, Arizona, Gila
 Canon Copper, Ray Lead Company
 Magma Copper Company. In every
 case the occurrence is similar.
 i The sedimentaries are tilted at var
 ious angles, are block faulted, and are cut by intrusive dykes of porphyry
 The ore bearing dykes are basic, prob ably altered diorite, and are the chan
 nels through which have entered the
 ore solutions. These dykes have come | up from profound depths. entering through the breaks made by the faults | The ore bearing solution, on their way up, passed first through the unrecep- tive quartzite and finally reached tho | limestone which rests on the quart zite. This ground was easily attacked
 by the acid solutions making caverns and refilling with the ore This ore | deposits along the fractures and alsc
 on the bedding. The lower portion ly- ] ing next to the quartzite being reached first has been the highest mlneralized and the ore shows less and less as greater height is reached and finally in the higher levels only small patches l and stringers are found. In other words, the great ore bodies will he found along the faults and dykes, in the limestones, immediately above the quartzite.
 The Ray Christmas or Mineral Creek district occupies a somewhat different position from the high grade faulted
 zones of the Pioneer district Here also are to be found lodes and Assures carrying great values in copper. lead zine and silver, through this district however, there runs q great body oi altered schist underlying which there occurs faulted zones carrying immense bodies Of low grade disseminated cop per ores. Such Is the property of the great Ray Consolidated Copper com pany
 The Magma. Silver King district otherwise known as the Pioneer min ing district. lies on the western slope of the Pinal range. Towering immed
 lately above are the awe-inspiring and
 far flung heights of vast formation known as Apache Leap the district abounds in surface indications Of great deposits of minerals, in many forms oi great richness and variety.
 Geology of the Pioneer District The geological structure of the Pio- neer region Is somewhat complex, but Is very interesting The whole coun- try appears to have been covered, ir comparatively recent geological times
 with volcanic rocks. partly in sedl- mentary form, as volcanic saudstones and congiomerates, and partly. and lastly. in a molten or lava form. Con-
 siderable areas of these rocks have
 been swept away by denudiation and
 erosion. leaving the older and founda
 ton rocks exposed to view. particular
 ly in the valleys and canyons. while
 remnants of the lava-flow cap the
 summits and in places remain as flat topped mountains: as for example. the
 mountain known as Tortilla. at old Pinal. back or the mill.
 The Pinal Range. above the Silver King Mine. is formed chiefly Of Palae-
 ozoic strata with heavy beds of quart
 site at he base, overlaid by massive
 limestones dipping eastwardlv. Tbess