Arizona republican., 1909-02-25

Analyses by Genth of specimens from Lake Valley, New Mexico, gave: | Vanadic acid ...........10.9 7.94 Arsenic acid ..-........13.52 10.73 Lead oxide .73.4S 1915 ! Chlorine ........... 2.45 2.1S From the Railroad mine, Castle | Dome, in association with wulfenite, vanadanite and cerussite. Specimens from Oracle, A. T., (prob ably from the Mammoth mine) gave Genth and Keller respectively:
 Genth. Keller Vanadic Acid ...169 17.16 Arsenic acid .......... S.O6 4.SO Phosphoric acid ........ 0.29 trace Lead oxide ....7749 THAT Chlorine " 241 2.46 Sesqui oxide iron ..... GAS
 EPIDoTE.
 Silicate of alumina, lime and iron of complex composition; pistachio- green or yellowish green in color.
 Of common occurrence in the meta morphic rocks of Arizona, especially in the red sandstones and shales. It is frequently mistaken by the inexperi- enced prospector for an ore of copper of which, like its associate, garnet, it is a frequent associate. Its yellowish- green color is not, however, due to the presence of copper. The metal Is often found distributed through the massive epidofe in the form of ragged grains or small thread-like masses, as at the epidote veins or croppings in the red shales of Silver Bell district, but not in quantity sufficient to jus tify mining.
 ERYTHRITE.
 Cobalt BIoom-A hydrous cobalt ar senate; arsenic pentoxide 3S.4. cobalt protoXide SIS, water 241.
 Samples of this mineral were re- ceived in January, 1905, from Mir. Herbert Brown of Yuma. (No. 6644)
 In the Cababi region southwest of Tucson, the precise locality unknown; found in samples of ore sent to the School of Mines for assay.
 FELSITE.
 An extensive stratified deposit of a white felsitic mineral is found on Milk creek, above Walnut Grove, Yatapai.
 FLUORlTE.
 Fluor Spar, Oerbyshire Spar. Fluor- inc 4S9, Calcium 511.
  much used in England for vases and mantel ornaments. It forms an i'm portant portion of the vein-filling or gangue of the lodes at Castle Dome, Yuma county, and may be picked up along the croppings, and is usually a delicate pink in color. It is also found in Pinal county, near the Mammoth mine, beyond Oracle, in a vein or mass several inches wide. green and purple in color
 At Helvetia, Pinal county, green. purple and pink. At Red Rock, Silver Bell district At Paradise, green and fluorescent (Mills, 1905), near Ludlow on Santa Fe railway BroadwelD. Useful as a Aux in smelting; an ingredient of cement mixtures.
 FooTEITE.
 ChIorhydrate of Copper. A deep blue-colored mineral de- ! scribed by Prof Koenig in 1891 as in the Copper Queen mine | implanted on limonite, but not seen l by Ransome in 1892, and evidently | rare.
 GALENITE. Lead suIphide, GALENA, sulphur 13.4, lead S6.6. Crystallizes in cubes, or modified | tions of the cube, but is usually found | massive with cubicaI cleavage. Good | crystals are comparatively rare It is | a common associate of silver bearing | minerals and is itself argentiferous, | being rarely without a few ounces of silver to the ton of ore.
 There are several important lead | bearing districts in Arizona, and ga- lena may be found in the veins of | most of the gold and silver bearing | lodes.
 Castle Dome in Yuma county, about | eleven miles east of Castle Dome | Landing on the Colorado river. twenty miles above Yuma, is one of the | oldest and most extensively developed | ead-yielding districts. It has sup piled lead ore continuously since the settlement of the country. and bears evidence of prehistoric working. The mineral veins may be said to have been re-discoVered in the year 1863, for it is certain that they were opened and worked at a remote pe- -iod before American occupation, probably by the Spanish explorers, md even by the aborigines, if not Tor smelting. for the glittering ore by crushing the galena. The ancient excavations extended to iepth of from five to fifteen feet, and followed the croppings of the vein for l hundred feet or more southward oward the banks of the Gla river, where traces of ancient smelting op- 'rations may be found.
 The veins which yield the lead ore .re good typical examples of the fissure vein.'' They traverse fine trained mica and clay slates md are from one to six and, in 'laces, twelve feet in thickness. They ave a general northwest and south ast course and are vertical or but title inclined The galena occurs in heet-like masses on one or both valls and also in nodular punches, bread through a gangue or vein tone of quartz, gypsum and fluor- par, this last mentioned mineral be- 1g the most abundant and charac- eristic. During the first six months of the ear 1879, 43S tons shipped to San 'rancisco averaged 69 per cent of sad and over 26 ounces of silver per 1n.
 The refined lead produced from I astle Dome ores is remarkable for S nl1ritv and softpacS and ftc Spa-