56h eR: Horwood—Upper Trias, Lewestershire. 
the Selangor side of the watershed, the one leased by Towkay T. 
Kim Bee. 
~The few adits driven into the mountain-side on the Selangor 
boundary show the presence of the tin-ore-bearing rock now being 
profitably exploited on the Pahang side, namely, a fine-grained to 
saccharoidal topazized granite or greisen passing into a quartz rock 
containing only a little topaz, and in some places into quartz free’ 
from topaz. ‘The cassiterite is disseminated through the rock. The 
picked material crushed by foot-stamps was found to contain 6°8 per 
cent of tin-ore, and in another place 4:2 per cent, whereas the rock 
crushed at the mill varied from 1 to 2 per cent. These figures were 
obtained from specimens collected on my visit, but considerable 
variation occurs daily, although the average from the whole mine 
may be fairly constant. 
The mineralization in this neighbourhood is so general and extensive 
that it is safe to predict for tin-mining a life of several years, if, of 
course, the metal remains at a good price. 
About 60 chains to the south-east of the Trigonometrical beacon 
of Ulu Bakau is a mine now being worked by lampanning. A vein of 
cassiterite-bearing rock has been exposed fora distance of 61 feet, 
having a direction of 81° south of east. The Chinese knew that this 
contained tin-ore and were enthusiastic over it, but confined their 
attention to lampanning for the present. There is considerable amount 
of lampanning to be done, but the tailings will not, fortunately, cover 
up the exposed veins.—W. R. J. 
GEOLOGIST’S OFFICE, BATU GAJAH, F.M.S. 
September 23, 1913. 
VI.—Tue Urrrr Trias oF LEICESTERSHIRE. 
(Continued from the September Number, p. 422.) 
By A. R. Horwoop, F.L.S. 
8. Economics anD WaTER SUPPLY. 
[{\HE economic resources of the Trias as a whole are not eran if we 
exclude the two main industries (bricks and gypsum), but.they 
are of interest from a practical standpoint, so that a short summary 
will be given here. 
The great impetus given to the quarrying of granite, syenite, and 
allied igneous rocks by improvements in blasting and boring methods 
has more or less caused the industry in Triassic building stones to 
become obsolete. 
At one time thick-bedded sandstones were used for building stone 
at Kegworth and other places in that district, and they were formerly 
worked at Burton, Bretby, Castle Donington, Donington Park, 
Weston near Ashby, and at Warton, just outside this area;. but they 
are rather soft, though hardening on exposure, and sometimes 
cemented by barium sulphate. They are worked at Melbourne 
and Weston. 
In the Upper Keuper’ the Dane Hill Sandstone series has been | 
1 Locally some thick-bedded skerries have been utilized in some cases. 
