142 



R. A. F. PENROSE 



Co., an English corporation, works alluvium which carries tin 

 from the surface down to a depth of from 5 to 30 feet without 

 any barren "overburden". At Campar, a French company, 

 known as La societe d' etan de Perak, has large open pits in the 

 alluvium of the valley of the Campar river, where the tin-bearing 

 stratum varies from 2 to 10 feet in thickness and is overlaid by a 



Fig. 3. — Stripping new tin ground south of Campar, Perak, Malay peninsula. 



barren "overburden " of about 40 feet in thickness. At Tronoh, 

 in the well-known mine formerly owned by Mr. Foo Choo Choon, 

 but recently sold to an English company, the "overburden" is 

 from 30 to almost 40 feet in thickness, and the tin-bearing 

 ground below has been penetrated by an open pit and an 

 inclined shaft. The incline is about 400 feet long, equal to about 

 140 feet vertically, and the bottom of the tin ground has not 

 yet been reached. This thickness of tin-bearing alluvium is, 

 however, very exceptional. Many other cases, showing other 

 variations in the conditions of the tin-bearing alluvium, might 

 be cited. 



