196 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



deposits, but is greatly subordinate in amount to limonite. It has 

 been noted in the surface ores of the Mammoth and Bunker Hill 

 mines, and soft, friable masses of micaceous scales have been seen in 

 oxidized material on the dumps of the upper Sullivan tunnel of the 

 latter. In a short tunnel on the east fork of Milo Creek above 

 Wardner, a short distance above the forks, hematite in soft ocherous 

 and compact red form is abundant. Much of the material in the 

 upper tunnel of the Lombardy claim in Italian Gulch north of Kellogg 

 is earthy red hematite. 



The specularite variety of hematite which has metallic luster and 

 gray to black color is often mistaken for galena. This variety is 

 common in the Coeur d'Alene district. A large mass occurs in 

 quartz on a tributary of the west fork of Big Creek east of Kellogg 

 Peak; specimens showing curved plates of specularite embedded in 

 limonite are found in the Yankee Girl Mine on Big Creek, and in the 

 Yankee Boy mine the mineral is present in narrow barren veins with 

 quartz, calcite, and siderite. Bunches of finely micaceous scales of 

 deep red specularite resembling graphite were found in the oxidized 

 ore of the Sullivan mine. This mineral has also been found in small 

 seams in and near the monzonite mass near Gem and on Ninemile; 

 in the Shuck Bros, claims near Jackass Peak, north of Kellogg; in 

 the Guelph workings near Sunset Peak; and on G. M. Burt's claims 

 on Placer Creek, south of Wallace. Compact-fibrous botryoidal and 

 stalactitic hematite occurs in some veins on the west fork of Pine 

 Creek, often in concentric layers alternating with limonite or goethite. 



WASHINGTON COUNTY 



In the vicinity of Iron Mountain, 6 miles east of Mineral, great 

 bodies of hematite are found, the principal deposit being a great 

 talus stream composed of blocks up to 20 tons in weight, extending 

 down a steep slope for 1,000 feet. At the top of the slope there are 

 exposed lenses of crystalline hematite 25 feet wide and 100 feet long, 

 in a siliceous porphyry intrusion 100 feet wide which contains 25 

 per cent iron in the form of disseminated hematite. Other smaller 

 lenses occur. Shallow development on some of the lenses seems to 

 indicate that they pass at slight depth into bodies of pyrite. 5 

 Others are clearly of contact origin and lie between granite and garnet 

 rock. One of the latter is 50 to 100 feet wide and extends down the 

 north side of Iron Mountain for 1,000 feet. 4 The hematite contains 

 small amounts of copper and gold. At the Barton mine in the same 

 general region one lens of pure hematite is 50 feet wide and 150 feet 

 long. 



J Robert N. Bell. 20th Rept. Min. Ind. Idaho, p. 108, 1918. 

 * J. B. Umpleby. U. S. Geol. Survey, Notebook for season 1915. 



