Bisbee daily review., 1908-02-02
TUNGSTEN ORE DEPOSITS ARE
 DESCRIBED
Interesting Article By Ralph w. Richards On Occurrence and Origin of Hubernite and SheeIite Ores in Dragons.

SneelIte tres ID UFdgOOflS.
 The following article is clipped from Mining Science:
 The tungsten deposits at RusSelville, 1 miles north of Dragoon. Ariz., a station on the Southern Pacific rail. road, have been previously described
 by Rickard- and Kellogg. The writer
 visited the deposits in 1906, and pre-. sents few notes on their occurrence and origin, together with discussion Of the conclusions of the quoted au- thors.
 The tungsten minerals, hubnerite and scheelite, occur in quartz veins cutting a granite stock which com- prises an oval area with an east-wes- diameter of about 1 miles and q nCIth-south diameter of about ? mics. The granite, as examined in the feli, vas found to be coarsely crystIl!:Ie rock, composed of large crystaIs of
 fslospar, presumably orthoci .se. uuartz and minor amounts of C3psco- vite and biatite. The granite IS H.Ich weathered and it was impossible 'o ge a fresh, sound specimen for thin section. The weathering is 50 ,s.f'G tIat the large ldspar crystais stan1 out as prominent knobs, anu can . picked up in quantities from the real dual gravel.
 The tungsten minerals JoCur in quartz veins ranging from : fe" inniles to several feet in thic6ns 5, and are either disseminated or in shoots dipping about 40 degrees N. The strike of the veins is about N. 40 degrees E., and the dip S. E. approx imately 70 degrees. The walls are in most cases sharply defined and con tinuous for long distances, some be- ing traceable for miles.
 Some of the quartz veins have suggestion of mash origin in the shape of wonderful slickensides, fut- ing and growing: this is especially true toward the northern end of the area. Rickard notes the presence. of and dioritic dikes in addition to quartz veins. but this was not confirmed in the present examina- tion Kellogg interprets the veins as "a very acid pegmatite-late emana- tions of the granite intrusion which filled crevices in the partly consoli- dated mass" Rickard holds that fed-spar was originally present In the veins and has been replaced pseudo morphically by the hubnerite; how ever, certain characters of the crys- tals, namely, cleavage and twining, make this improbable; furthermore, it is not necessary to assume the pres ence of feldspar among the last prod ucts of the cooling of granite magma, which consist, mainly of silica, steam, hot water, fiuorite and hydouuoric acid.
 We do not have to choose between a pneumatolitic or an aqueous origin for the tungsten ores and the veins, or to harmonize the two processes, as they apparently blend. A critical ex- animation of the quartz as the more abundant gangue mineral seems to bear this out. In some cases it con sists of interlocked crystals, and in other more abundant cases is a fine white translucent variety called local ly .'bull quartz" which Rickard dis as of "apIitic origin" The latter may be regarded as that cooling from colution. while the former was at first at feast deposited from hot water.
 The hubnerite is reddish-brown in mass to cherry red, translucent in thin plates On fresh cleavage surfaces. It occurs in radiated crystals which are bladed and twinned. The crystals range to in. in length by 1-2 in. or more thick, and are occasionally Tn zxvo-nIfnxx 0r.o1 pounds One 200-lb mass is said to have been taken out and another, which is reported to have been open ed up by the Deninger Co, yielded two tons sof ore. The streak of the huDnerite is yellowish-brown. and the specific gravity 7.3. The superficial of the hubnerite to blende is conspicuous, and probably accounts for the long time the occur renee Of the mineral was known with out its nature being recognized.
 Scheelite is comparatively rare and usually in splotchy masses close associated with the hubnerite and, while it is in the main clearly pri-- nlary in occurrence, yet alteration of the latter to minute pyramidal crystals of the former in some of the speci- mons were brought to the writer's at tention by Dr. Charles Palache, and It is interesting as being the reverse of the ordinary change of scheelite to wolframite Three very perfect crys- tals with simple pyramidal habit were seen in the collection of MT. F. the local manager of the These crystals were be- tween wax-yeilow and orange in col Or and about l 14 In. in diameter. 5cheelite ordinarily has a greasy, vel low, soap-iike appearance which IS used to distinguish it from iron-stain- ed quartz.
 Wolframite is said also to occur by but he fails to give details and it's occurrence was not confirmed either in the field, in the Halderman collection, or on examination of the Kellogg made a greater and described the hubnerite as wolframite.
 The opening of the vein deposits has been largely in the nature of pros pecting shafts and tunnels. The stream beds and arroyos throughout the granite area are lined with a float" of the weathering products of the granite and the enclosed veins. These constitute placers that are rich and easily worked during the vet season. The high specific gravity