288 BROWN & HERON: GEOLOGY AND ORE DEPOSITS OF TAWy 



Kanbin chaung vein, which is 12 inches thick, also crosses from the 

 Hermvingyi property. It strikes north-west and south-east and 

 dips at 80° to the south-west. 



A vein about 12 inches thick, striking north-north-east and south- 

 south-west, is also known to occur in association with the most 

 northerly exposure of granite in this region. 



Hennyingyi.—Ey far the most important of this group of small 

 granite bosses is the southernmost, on which the Hermvingyi mine 

 of the Hermvingyi Mining Co. 1 . is situated. In 1909 Mr. Pa<y 

 recorded the existence of wolfram in roughly parallel veins from 

 10 inches to 5 feet in width in the granite of this locality, and in 

 1910 a concession was applied for by Mr. Baldwin on behalf of 

 Tavoy Concessions, Ltd. This was granted in 1911. In 1917 

 a lease for a period of 30 years dating from 1913 over an area of 

 1,782 acres was granted to the company. 



Since the commencement of operations the output has been 



as follows : — 



Year - Tons. 



1010 



1011 



1912 ; * ; 177 . 8 



1913 189 . 4 



1914 



1915 



1916 ' 



1911 1038-0 



0-9 

 86-3 



432-12 

 040-20 

 766-4 I 



191S 



808 



The approximate average composition of the concentrate for 

 the past few years has been — Vein ore 46 per cent, W0 9 and 21 per 

 cent. Sn. Detrital ore 38 per cent. \V0 3 . and .">2 per cent. Sn. 



The axis of the granite exposure is about 1,500 yards in length 

 and urns approximately north-north-west and south-south-east lis 

 greatest width is 150 yards, but it narrows to considerably less than 

 this at either end. It is breached by a small stream known as the 

 Maungmeshaung chaung practically at right angles to its axis, and 

 is thus divided into two hilly sections known as Tin Hill and Big 

 Hill respectively, separated by the narrow valley of the stream. 

 Both sections exhibit granite capped on the highest points and 



1 Now Burma Financo and Mining Co., Ltd. 



