﻿182 DR. W. E. JONES ON THE SECONDARY [vol. lxxii, 



in this district and their outputs for the year 1913. (1 picul, or 

 pkl.,= l|}lbs.):— 



(1) Tronoh Mines 33,730 pkls., (2) French Tekka, Gopeng, 11,566 pkls., 

 (3) Lahat Ltd. 8604 pkls., (4) Tambun Mine 7582 pkls., (5) Tekka Ltd., 

 Gopeng 5772 pkls., (7) Ulu Piah 5590 pkls., (7) Penkalan 5239 pkls., 

 (8) Gopeng Consolidated (old section) 4870 pkls., (9) Menglembu Lode 

 4726 pkls., (10) Malayan Dredging Company 3780 pkls., (11) Kinta Tin- 

 Mines 3546 pkls., (12) Kramat Pulai 3436 pkls., (13) Tronoh South 2899 pkls., 

 (14) Gopeng Consolidated (new section) 2874 pkls., (15) North Tambun 

 2620 pkls., (16) Chendai Meru 2359 pkls., (17) Kledang 2080 pkls., (18) Pusing 

 Bharu 1490 pkls., (19) Sultan Idris 1455 pkls., and (20) Siputeh 1186 pkls. 



Total = 114,634 pkls., or more than 6823 tons. 



The positions of these mines are indicated on the accompanying 

 map (PI. XV) by the number corresponding to their place in the 

 above list, and it will be noticed that the maximum distance of 

 any of them, with one exception, from granite or from a granitic 

 intrusion 1 is less than a mile, and that nearly all are within a few 

 yards of an igneous intrusion. No fewer than seventeen of these 

 mines are situated either actually at the junction of the stanni- 

 ferous granite of the Main Range and the Kledang Range, or are 

 traversed by granitic intrusions proved to contain tin-ore in sitto. 

 The presence here of these acid igneous rocks is not disputed, for 

 Mr. Scrivenor has himself described their existence. 3 



The theory that these stanniferous deposits are of glacial 

 origin and of greater antiquity than the granite and granitic 

 intrusions of Kinta involves its author in very serious difficulties. 



The position of the clays at Tronoh Mines, for example, does not 

 fit in with the glacial theory, as they are (in many places) 

 underlain by sandy beds containing lignite and carrying rounded 

 grains of tin-ore. They appear to be alluvial deposits filling a 

 huge solution-trough in the limestone. Mr. Scrivenor, however, 

 describes the solution -cavity as 



' being filled, in part at any rate, with Gondwana boulder-clays, lignite, and 

 sand, and ending abruptly on the west side against a reversed fault.' 



This reversed fault must, according to the section given, have a 

 throw of some hundreds of feet. In a previous description of the 

 same mine the beds were stated to be altered sedimentary rocks, 

 granite, and pegmatite, and Mr. Scrivenor writes 



' I have seen both pegmatite and altered sediments in situ underground in 

 Tronoh, and also veins of quartz with cassiterite . . . This clearly points to 

 the small hill as the source of the tin-ore.' 3 



1 By ' granitic intrusions ' are meant the veins of aplite, pegmatite, and 

 quartz which are intrusive into the schists and phyllites and the cassiterite- 

 bearing quartz-Veins that traverse the metamorphosed limestone of Kinta. 



2 'The Geology & Mining Industry of the Kinta District' 1913 : see geo- 

 logical sketch-map. 



3 ' The Geologist's Report of Progress, 1903-1907 ' Kiiala Lumpur, 1907, 

 p. 40. 



