124 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



main mass of the vein filling. In the Caledonia it forms irregular 

 grains and masses included in tetrahedrite or replacing siderite and 

 also as larger masses of pure chalcopyrite, sometimes 250 kilograms 

 (500 pounds) in weight. 



In certain veins rich in iron sulphides which occur in the Prichard 

 slates near Kellogg chalcopyrite is common as in the Teddy, Lom- 

 bardy, Wisconsin, Enterprise, and other claims. The gangue here 

 is quartz and ankerite. Over 20 tons of chalcopyrite ore were sliipped 

 from the Wisconsin claim some years ago as copper ore. 



In the Pine Creek district chalcopyrite is a common constituent 

 of the mixed sulphide lead-zinc ores where it occurs in a quartz and 

 sometimes ankerite gangue. Banded ore from the Highland-Sur- 

 prise mine contains alternating streaks of chalcopyrite, galena, and 

 sphalerite. In the Shetland claim it is abundant as grains and small 

 masses in quartz with galena and sphalerite and the occurrence in 

 numerous other mines is the same. In the Northern Light, Bobby 

 Anderson, Carbonate, Lookout Mountain, and Hypotheek mines it 

 occurs in isolated and pure masses of moderate size in white quartz. 



On the North Fork and Little North Fork of the Coeur d' Alene 

 River chalcopyrite occurs in numerous prospects as the Britt, Hand- 

 spike, Shuck, Alva Brown, Riverside, Hamburgh-American, and 

 Horst-Powell (Empire). At the latter property a considerable 

 amount of chalcopyrite ore has been mined. 



In the St. Joe drainage area chalcop}^rite is abundant in a consider- 

 able number of prospects, some of which have made a small produc- 

 tion of copper ore. It is the only important primary sulphide and 

 occurs mixed with a little pyrite and pyrrhotite in a gangue of quartz 

 and ankerite. The Monitor and Black Prince are the principal 

 mines of this group. 



WASHINGTON COUNTY 



Chalcopyrite is a constituent of the silver ores mined in the Min- 

 eral district around the town of Mineral, where it occurs in veins 

 with tetrahedrite, pyrite, galena, and sphalerite. 8 



SMALTITE (87) 

 Cobalt diarsenide, CoAs 2 Isometric, pyritohedral. 



LEMHI COUNTY 



Umpleby 9 states that a cobalt arsenide, possibly smaltite, occurs 

 in the cobalt ores of the Blackbird district in grains of microscopic 

 size as a replacement of quartzite and schist, and is perhaps the most 

 abundant cobalt mineral of the district. All specimens of the ores 

 wnich have been available to the writer for examination have proven 

 to carry cobaltite rather than smaltite, although the latter probably 

 is present. 



» Waldemar Lindgren. U. S. Geol. Survey, 22d Ann. Rept., pt. 2, p. 754, 1901. 

 » J. B. Umpleby. U. S. Geol. Survey, Bull. 528, p. 77, 1913. 



