IX. NOTES ON A CAPE BRETON MINERAL CONTAINING 

 TUNGSTEN, AND ON THE EFFECT OF WASHING CERTAIN 

 CAPE BRETON COALS. BY HENRY S. POOLE, F. G. S., 

 F. R. S. C., Assoc. Roy. Sch. Mines, etc., Stellarton, N. <SL 



(Read April Uth, 1900.) 



In the last issue of the Transactions of this Institute there" 

 was published a paper read March 13th, 1899, entitled " New 

 Mineral Discoveries in Nova Scotia." The paper made reference 

 to the finding at North East Margaree, C. B., of a mineral con- 

 taining tungsten and speaks of it as Wolframite with 67.47 per 

 cent, of W O 3 , but makes no note of its other constituents. &.. 

 month later, at a meeting of the Mining Society, Mr. A. C. Ross 

 read a paper on the same mineral, and in the discussion which 

 followed an analysis made by Mr. Mason, the assayer at Hali- 

 fax, was given by Mr. Missener. This analysis,* of concentrated 

 ore, showed but a trace of iron, and was as follows : 



Tungsten Trioxide 6(3.32 



Silica 6.25 



Manganese 12.02 



Iron. . .12 



8471 



* The following letter from Mr. Mason gives additional information about this 

 analysis : 



Halifax, Nova Scotia, April 23rd, WOO. 

 MY DEAR MR. POOLE : 



The analysis was made for commercial purposes, not for scientific ones. How- 

 ever, being of a curious turn of mind I am able to give you some further information, 

 although unfortunately only qualitative, not quantitative. A close inspection of the 

 mineral (I fancy I gave you a sample) will I think reveal that it is composed of Quartz 

 and Hiibnerite principally, but there is also a little Scheelite. With regard to the 

 missing 15 per cent., the Manganese is reported as metal. I fancy it exists in the 

 mineral as Mn 3 O 4 , and if so, that accounts for a difference of about 4.5 %. The bal- 

 ance was ihade up of mixed oxides of Niobium and Tantalum, and also of Lime. 

 Whether the lime all belongs to the scheelite or whether part of it should join the 

 quartz as gangue, I did not determine. I regret that I have mislaid the memo, of the 

 quantities. I did not discover that the mineral also contained Scheelite until I panned 

 some of it, but afterwards clearly detected it in some samples but could not find it in 

 others. Yours very truly, 



F. H. MASON 



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