96 Wells and Penfield — JVew Occurrence of Sperrylite. 



The discovery that platinum exists in the ores of the Rambler 

 mine is quite recent and of great interest. Professor Knight 

 states'* that platinum is found in ores from all parts of the 

 mine in quantities varying from *06 to 1*4 ounces per ton 

 (•0002 to -0048 per cent.), and that it is apparently most 

 abundant in the covellite ore. From his account it seems prob- 

 able that the platinum in this mine will be of considerable 

 commercial importance. 



The occurrences of sperrylite in Ontario, in Wyoming, and, 

 as Hiddenf has found, in several places in a JSTorth Carolina 

 district, show that the mineral is widely distributed on this 

 continent. It is to be hoped that copper ores will hereafter 

 be carefully examined for platinum, and that future discoveries 

 may be made which will tend to alleviate the present 

 threatened dearth of this useful metal. 



Sheffield Scientific School, 



New Haven, Conn., Jan. 7th, 1902. 



* Mining and Engineering Journal, Dec. 31, 1901, p. 845. 

 f This Journal (4), vi, 381 and 467 (1898). 



