TY - BOOK AU - Lee,Ah Kow TI - An overview of the geology, mineralization and economic status of operating mines in the Ipoh Selatan sector, Perak, malaysia: as on 1st January 1990 PY - 1991/// KW - mineralogy KW - Perak N2 - The placer cassiterates are derived mostly from erosion of late pneumatolytic post-granitic emplacement of tin-bearing veins, stockworks and stringers ER -