200 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



It was found by D. F. Hewett with cerusite in oxidized ore of the 

 Plughof (formerly the Lark) mine, 2 miles southwest of Belle vue. 



CUSTER COUNTY 



Minium has been noted in small amount in specimens from the 

 upper portion of the Beardsley vein, Bay Horse district. 9 



LEMHI COUNTY 



Minium occurs as a bright red powder of greasy luster partly 

 filling little cavities in the oxidized ore near the surface in the Pitts- 

 burg-Idaho mine in the Texas Creek district, 10 and in fine specimens 

 associated with plattnerite and siderite in the Democrat claim of 

 Frank Grooms, near Gilmore. 



OWYHEE COUNTY 



Minium has been found in oxidized lead ores from the South 

 Mountain district. 



SHOSHONE COUNTY 



The only reported occurrence of this mineral is on the Silver Dollar 

 claim in Idaho Gulch, 2 miles east of Murray, where it occurs with 

 galena. 11 



BRAUNITE (247) 



Manganese oxide-silicate, 3Mn 2 3 .MnO.Si0 2 . Tetragonal. 



LEMHI COUNTY 



This oxide of manganese is reported by Umpleby to occur in the 

 ores of the Kittie Burton mine, Indian Creek district, Lemhi County, 

 as small brownish-black granular masses and scattered minute 

 pyramidal crystals. 110 This is a gold-bearing vein of bluish coarse 

 vein quartz containing abundant pyrite with braunite, chalcopyrite, 

 and pyrrhotite. Small amounts of rhodochrosite coat fractures in 

 the ore. 



CASSITERITE (248) 

 Tin dioxide, Sn0 2 . Tetragonal. 



LEMHI COUNTY 



Stream tin occurs along Panther Creek near its junction with 

 Moyer Creek and is also reported from Silver Creek. In neither 

 place, however, have deposits of commercial extent been demon- 

 strated. 116 The latter deposit has been prospected sufficiently to 

 show the absence of tin in commercial quantity, but the former is 

 inadequately developed. Individual pieces of the cassiterite vary 



» J. B. Umpleby. U. S. Geol. Survey, Bull. 539, p. 53, 1913. 

 if J. B. Umpleby. U. S. Geol. Survey, Bull. 528, p. 78, 1913. 

 " Adam Aulbach. Correspondence in Wallace, Idaho, Press-Times, about 1917. 

 'i° J. B. Umpleby. Bull. U. S. Geol. Survey, No. 528, p. 75, 1913. 

 "" J. B. Umpleby. U. S. Geol. Survey, Bull. 52S, pp. 74, 76, 1913. 



