1194 GEOLOGY AND PHYSICAL GEOGRAPHY OF THE STATE OF PERAK, 



could easily be distinguished by those who have had a little 

 experience in tin ores. 



Without entering into detail I may refer generally to all the 

 mines about Thaiping as affording instances of the origin of the 

 stream tin deposits. The Residency of Thaiping is built on a small 

 isolated hill, capped with red clay, about 100 feet or so above the 

 plain. Very rich mines were formerly worked at the foot of it. 

 There are other hillocks of the same kind at the base of which tin 

 is now worked, and there are others farther out in the plain where 

 the yellow clays give a fair indication that tin deposits may be 

 looked for at a moderate depth. 



Five samples of pure tin ore carefully picked and separated from 

 impui'ity gave the following results for Specific Gravity. 



Sample 1. Thaiping 6-78 



2. Thaiping 6-80 



3. Klian Pow ... ... ... 6 '77 



4. Kamunting ... ... ... G - 80 



5. Assam Kumbang... ... ... 6*78 



Most of the specimens are hard enough to scratch glass. 



It is remarked that the stream tin of Australia is rich in 

 sapphires and other gems. In Perak there appear to be none. 



Assam Kumbang. 



Due north of the town of Thaiping, a spur from the 

 range extends, and round the foot of this in a direction N.N.W. 

 from the town are the mines of Assam Kumbang. They commence 

 about a mile from the town, and continue round the foot of the 

 mountain for three or four miles. These mines are mainly 

 distinguished for the great distance they extend from the range. 

 Tt will be understood from the conditions under which stream tin 

 accumulates, that it cannot be looked for far from the influence of 

 rapid streams, or from where rapid streams have formerly been. At 



