80 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



Benton mine which adjoins the Stanley. The Hougland mine, 8 

 miles from Burke has produced considerable stibnite from flat-lying 

 quartz veins. At one time an oxide plant was operated at this 

 property. 



In the Coeur d'Alene district the stibnite occurs entirely in dis- 

 tinct antimony veins which have many features in common with each 

 other, but are different from the several other classes of deposits in 

 this region. Stibnite is not known to occur in galena-bearing veins, 

 the so-called stibnite of the Gold Hunter, Bunker Hill, and other 

 mines all being boulangerite or a related sulpho-salt of lead. 



VALLEY COUNTY »» 



Stibnite, very clean and free from other sulphides, occurs on the 

 rim of Yellow Pine Basin. The country rock is granite containing 

 dikes of aplite and pegmatite and gold-bearing magmatic quartz veins. 

 The sulphide ore reaches practically to the surface, there being only a 

 thin skin of oxides. East of Johnson Creek there are two or three 

 distinct quartz-stibnite veins. One of these which is traceable for 

 1,200 meters shows from 15 to 45 cm. of pure stibnite. At one point 

 there are several lenses of practically pure antimony sulphide, the 

 largest lj^ meters wide with a length of 10 to 12 meters. The 

 stibnite occurs both as a vein filling and as an irregular replacement in 

 the surrounding granite pegmatite formation. On the west side of 

 Johnson Creek the cliffs rise abruptly from a steep talus slope. The 

 cliff face, composed of a siliceous rock, possibly alaskite, is 150 meters 

 high and over a mile long and contains sporadically distributed 

 buches of stibnite. Bowlders in the talus of 3 or 4 tons weight are 

 one-fourth this mineral which appears to represent segregated bunches 

 throughout the rock mass of the cliff. Samples of the granitic rock 

 of the region contain one-half of 1 per cent of antimony in micro- 

 scopic grains. Similar deposits of antimony ore are reported from 

 the same general region, notably at Cinnabar and near Edwards- 

 burg. 40 



BISMUTHINITE (29) 



BISMUTH GLANCE 

 Bismuth sulphide, Bi 2 S 3 . Orthorhombic. 



BOISE COUNTY 



Bismuthinite occurs commonly in several gold mines of the Boise 

 Basin region where it has frequently been mistaken for stibnite. 



89 A new county created from a part of Idaho County. Its localities for most minerals are mentioned 

 under Idaho County. 



»D.C. Livingston. Univ. of Idaho School of Mines Bull. 2, pp. 49-51, 1920. See also R. N. Bell. 20th 

 Ann. Rept. Mining Industry of Idaho, p. 99, 1918. 



