The ore deposits of Utah . a cherty mass. Thisbody of silicified rock has been more resistantto erosion than the surrounding rock andstands up as a hiU several hundred feet iron deposits are near the summit of the The ore consists of yellow and reddish earthyhydrous oxide of iron, with some brown andblack hydrous oxides of manganese and iron,and some beautifully formed stalactitic massesof limonite. The ores, as they now exist, ap-pear to have been formed by the alteration ofother minerals. In general the deposit doesnot differ markedly in appearance from thegossans formed by the oxid
The ore deposits of Utah . a cherty mass. Thisbody of silicified rock has been more resistantto erosion than the surrounding rock andstands up as a hiU several hundred feet iron deposits are near the summit of the The ore consists of yellow and reddish earthyhydrous oxide of iron, with some brown andblack hydrous oxides of manganese and iron,and some beautifully formed stalactitic massesof limonite. The ores, as they now exist, ap-pear to have been formed by the alteration ofother minerals. In general the deposit doesnot differ markedly in appearance from thegossans formed by the oxidation of sulphidebodies. No remnants of sulphide were observedin the ore body, nor was sulphide noted in theadjacent wall rock. Considerable iron oxidestogether with other oxides were evidently re-moved from the monzonite during the altera-tion and this may have collected in the fissuresand formed the bodies of iron ore. ALTJNITE VEINS. In the area between BuUion and Little Cot-tonwood canyons, and south of Little Cotton-. T^ Alun 1 te (n place?^ Tunnel o Alunlte floato Shaft Figure 53.—Map showing location of prospects in the principal group of alunite deposits near Marj-svale. elevation and near the center of the area ofaltered quartz monzonite. The sihcified areais irregular but probably exceeds a mile inlength from north to south and is fuUy half amile in width. The altered rock is composedessentially of quartz with small amounts ofoxides of iron and possibly of manganese. wood Canyon, north as far asBelnap, and in thearea northeast and east of Marysvale therehas been considerable development of alunitedeposits during the last few years. (See ) The nature of these deposits was first rec-ognized in the faU of 1910, though the veins ofpink spar had long been known to prospectors. TUSHAR RANGE. 547 ALTERATION OF THE COUNTRY ROCK. The deposits occur in large veins of almostpure alunite and as partial replacements ofcountry rock. The waU rock has hoen intensely altered
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
