188 



REPORT OF NATIONAL MUSEUM, 1899. 



very constantly associated with the ores of nickel (niccolite, millerite, 

 chloanthite, etc.), and is obtained as a by-product in smelting. Con- 

 siderable quantities have thus from time to time been obtained from 

 the Gap mines of Pennsylvania, Mine La Motte, Missouri, and Love- 

 lock, Nevada. (Specimen No. 61324, U.S.N.M.) The nickel mines of 

 New Caledonia are perhaps the most productive. The ore here (a sili- 

 cate), carries some 3 per cent of cobalt protoxide. (Specimen No. 

 61027, U.S.N.M.) 



A vein of cobalt ore near Gothic, Gunnison County, Colorado, is 

 described as lying in granite, the gangue material being mainly cal- 

 cite, throughout which was disseminated the ore in the form of 

 smaltite. With it were associated erythrite, a small amount of iron 

 pyrites, and native silver. An analysis of this ore yielded as below: 



Bismuth 1. 13 



Copper 0. 16 



Nickel Trace. 



Silver... .. Trace. 



Cobalt 11.59 



Iron 11.99 



Arsenic; 63. 82 



Silica 2. 60 



Lead 2. 05 



Sulphur 1. 55 



A cobalt ore, consisting of a mixture of glaucodot and erythrite, 

 occurring near Carcoar Railway Station, New South Wales, has the 

 composition given below: 



94. 89 



According to the Annual Report, Department of Mines, for 1888, 

 this ore occurs concentrated in irregular hollows and bunches, often 

 intimately mixed with diorite in a line of fissure between an intrusive 

 diorite and slate, the fissure running for some distance following the 

 line of junction between the two rocks, and being presumably formed 

 at the time of the extrusion of the diorite. 



