298 BROWN & HERON: GEOLOGY AND ORE DEPOSITS OE TAVOY. 



The concentrate from llie veins is practically tin free. The 

 average is about 1 per cent. Sn, in the detrital concentrates. 



The eastern contact of the granite runs right through the area, 

 so that the western end is made up of granite and the eastern of 

 sedimentary rocks. Veins occur in both sections, but the most 

 important ones are in the sedimentaries of the Yebutaung where 

 the strike is north-east, south-west and the dip about lo to the 

 north-west. These veins and the smaller ones on Show Sliwe 

 Taxing carry large quantities of mica and pyrite as well as wolfram. 



Most of the output from the western end of the mine is obtained 

 by hydraulicing the surface deposits and soft decomposed granite 

 which underlies them, the values being derived from thin veins, 

 stringers and greisOD bands. The length of piping used is about 

 a mile with a head of 230 feet. Unfortunately water is only avail- 

 able for about five months during the year. 



Heinda. — Four miles south of Rubber Mile and about one mile 

 to the east of the main granite boundary is the peak Chauk-to-wo 

 Taung, 2,25(5 feet above the sea. The Heinda mine of Messrs. Steel 

 Bros. <fc Co.. Ltd.. is situated on this mountain. A prospecting 

 license was originally granted over the area in 1916, which has 

 changed hands several times before it came into the possession of 

 the present owners. 



All the workings are on a Hat vein which crops out on the north- 

 eastern, southern and south-western flanks. According to the 

 manager, Mr. Malcolm K. Clarke, the general strike is north 20° 

 east, south 20° west and the dip is 30° towards the east, but as the 

 vein rolls considerably, variations are liable to occur. The vein 

 itself is in sedimentary rocks and has an average width of 8 inches, 

 but it is pinched in places to a thickness of 2 inches. Rich patches 

 of wolfram are of common occurrence in it and the concentrates 

 are practically tin free. 



Output. Tons. 



1916 10 



1917 M, 



1918 17 



(c) I'aI'XCDAW. 



The southern and most important group of mines in this 

 section is known as I he 1'aungdaw gioup. The most northern one 



