Bulletin of the Geological Society of Malaysia, Volume 26, April 1990, pp. 181 – 188
1Bundesanstalt fϋr Geowissenschaften und Rohstoffe, P.O. Box 510153, D-3000 Hannover 51, Fed. Rep. of Germany
2 Directorate of Mineral Resources, Bandung, Indonesia
Abstract: The newly discovered primary tin occurrence at Sungei Isahan, Sumatra, Indonesia, has cassiterite mineralization emplaced on the slope of Bukit Pintu Tuju in fine-grained muscovite granite characterized by strong hydrothermal alteration.
The granite grades into greisen zones which often border quartz veins and lenses that carry tourmaline, muscovite and coarse cassiterite.
A similar radiometric age and geotectonic position allow the Sungei Isahan mineral occurrence to be correlated with the Main Range of Peninsular Malaysia.