Arizona republican., 1916-11-23
mechanically enclosed

of silver mechanically enclosed with it.
 Tetrahedrite - Aregntiferious gray copper. This species Was more abund- ant in the upper levels than in the lower. It vas found not only in the porphyry but in punches in the midst of the large body of quartz above and in the third level. Assays of this spe- cies have yielded at the rate of s1200 to SlS0O per ton, and even over 5000 ounces, In the year 1880 it was re- garded as one of the most important ores Of the mine IL now seems to be partly replaced in the lower levels by zinc blends
 bornlte-Bornite and Chalcopyrite occur but sparngly and in small crystalline grains. Iron pyrites is frequently seen as a druse upon the filaments of slvcr,or coating some of the massive ore if blende and igalena, or associated with iron spar of the Veinstone. Chalcopyrite. in small nodular masses occurs also in associa- ton With the stromeyerite; being ap- parently imbedded in the midst of the mineral
 Sphaerite tZnc Blende) e)-This is an abundant mineral in the ore, and presents itself in a variety of forms: sometimes in beautiful transparent oil-green crystals and again in black masses without any crystalline facets except by cleavage. The crystals are so brittle and easily cleaved that it IS very rare to get one with single perfect place. Some fragments before r,le appear to be compound dodecahe- dral crystals with re-entering angles, and hopper shaped cavities. Films. or thin sheets of iron -sulphite- pyriet a cyia ivYat. .la ,ta T along the lines of cleavage
 This mineral is abundant, especially upon the seventh level of the mine, and is closely associated with the sil- yer The amount of silver which the crystals hold either in combination or mechanically entangle Is variable. Clean crystalized fragments, of the dark color. after powdering and sift- lEg yield by assay from S170 to S200 in value per ton in silvers The metal Is probably in mechanical combination. and experiments are necessary to de- termine whether the clean. clear hlende carries the silver in any other form. The lighter olivegreen in va riety has yielded by assay as low a value as from $26 to s42 per ton.
 The ore as now concentrated and shipped contains nearly IS per cent of zine, chiefly or wholly in the form of blende.
 Calcite-This species is not abund- ant in the mine and does not appear to play any important part in the combination of minerals or the forma- ton of the vein. It is chiefly interest ing by it's occurrence in small crystals. impaled, or strung like beads. on the threads of silver. These crystals are m the form commonly known as 'hail-head spar" being obstuse shom- bohedrons of the minus series.-lkR, with the primsmatic planes Lii cor responding to figure 55S. B., Danna's Minerology
 Quartz-This is the chief veinstone Of the mine and is found massive and crystalline and milk .white. purple amethystine and a,-~ clear The crys- tads are frequently found dissemin- ated in the midst of the stromeyerite and apparently without attachment to base. It forms cones and rosettes in cavities and is sometimes in large crystals. One from the seventh level is six inches long and three and one half inches in diamater and has i'm 1 perfect terminations at each end. On, end being carernous with manw in- terrupted planes and smaller implant- cd crystals at the side The purple or amethystine variety is met with i'm 
 beded in the dark green ore bearing rock. The porphyry of the miners and is by them considered as i gooC sign for rich punches of silver ore. II Is usually in the central portions oi white quartz. Some masses Of cale. donic quartz. mining cavities. hay, been found in the dark green rock.
 Barite-lt is found massive ir bnnches and next to quartz. it is th, most abundant veinstone or gangue but is not as closely associated witt the rich ore as the quartz. Much tho larger portion is easily sorted out bs hand and thus does not interfere witt the concentration of the ore on tn, tables of the mill
 Note-As the result of prospectin, the indications are that these sam. mineral formations occure in all part Of tfis great district