124 



Chromite occurs in the peridotite in short irregular 

 veins and in bunches, which are clearly segregations 

 developed in the magma during cooling. Analyses made 

 by Mr. R. A. A. Johnston of the Geological Survey of some 

 of these chromite segregations, taken from the north slope 

 of Olivine mountain, yielded both platinum and diamonds 

 in variable amount. In making the original analysis the 

 chromite was separated into two parts, a magnetic and 

 a non-magnetic part. The non-magnetic part yielded 

 three per cent of diamond, and the magnetic part six per 

 cent. 



The diamond product obtained disintegrated to a 

 powder shortly after being released from the rock, and the 

 disintegrated particles were found on examination under 

 the microscope to be individual crystals. Studied in thin 

 sections, the diamonds were found to occupy small veinlets 

 traversing the chromite. 



Since the discovery of diamonds in the solid rocks the 

 gravels of Tulameen river have been carefully examined. 

 Gravel taken from the river in the neighbourhood of Eagle 

 creek was panned, and a large number of small diamonds 

 obtained along with the black sand. Small rubies were 

 also found to be present. 



Some prospecting for diamonds of commercial size is 

 being carried on in the valley of Tulameen river, but up 

 to the present the results have not been satisfactory. 

 Some diamonds have been obtained, but the largest is 

 not bigger than a pin's head. 



References. 



1. Kemp, J. F U.S.G.S. Bulletin No. 193, 1902. 



2. Camsell, Charles Summary Report, G.S.C. 1909. 



3 Platinum Mining in the Tulameen 



District, Can. Min. Inst. Vol. 13, 

 1910. 



4 A new Diamond locality in the 



Tulameen District. Econ. Geol. 

 Vol. 6, No. 6, 191 1. 



