Bulletin of the Geological Society of Malaysia, Volume 48, 125-128

Characterisation of amang minerals from the Klian Intan area, Upper Perak

CHENG KWONG KIONG & TEH GUAN HOE

Department of Geology, University of Malaya, 50603 Kuala Lumpur

Abstract: Samples of amang were collected from Rahman Hydraulic Tin Mine, Klian Intan, Upper Perak, and its adjacent areas, for both physical and chemical characterisation. Results show that the amang from the Klian Intan area contain mainly arsenopyrite, pyrite, cassiterite, wolframite, rutile, zircon, and iron oxides. The main iron oxide present is hematite, which shows botryoidal texture and zoning. Goethite and gangue minerals replaced some of the hematite grains. Some of the arsenopyrite grains were replaced by covellite and scorodite, while the pyrite is mainly associated with quartz and wolframite. There are still valuable amounts of cassiterite in the amang from the Klian Intan area. Some of the cassiterite grains show exsolutions of tapiolite. Some are associated with sphalerite, pyrite, and wolframite. EPMA study has identified several new minerals, which have not been recorded yet in the Klian Intan amang. These include wittichenite (Cu₃BiS₃), boumonite (PbCuSbS₃), boulangerite (Pb₅Sb₄S₁₁), and possibly tsugaruite (Pb₄As₂S₇) and trippkeite (CuAs₂O₄).

Abstrak: Sampel-sampel amang telah dikutip dari Lombong Bijih Timah Rahman Hydraulic, Klian Intan, Ulu Perak, dan kawasan-kawasan yang berdekatan dengannya untuk pencirian sifat fizikal dan kimia. Keputusan menunjukkan bahawa amang dari kawasan Klian Intan mengandungi arsenopirit, pirit, kasiterit, wolframit, rutil, dan oksida-oksida besi. Okisida besi utama yang hadir ialah hematite, yang mempamerkan tekstur bergugus dan penzonan. Goethit dan mineral-mineral gang telah menggantikan sesetengah butiran hematite. Sebilangan daripada butiran arsenopirit telah digantikan oleh covellit dan scorodit sementara pirit pula didapati berasosiasi dengan quartz dan wolframit. Terdapat kuantiti kasiterit yang bernilai di dalam amang dari kawasan Klian Intan. Sesetengah butiran kasiterit yang hadir menunjukkan exsolusi tapiolit. Ada juga yang berasosiasi dengan sfalerit, pirit, dan wolframit. Kajian EPMA telah mengenalpasti beberapa mineral berat, yang belum direkod di dalam amang Klian Intan. Ini termasuk witichenit (Cu₃BiS₃), boumonit (PbCuSbS₃), boulangerit (Pb₅Sb₄S₁₁), dan kemungkinan tsugaruit (Pb₄As₂S₇) and trippkeite (CuAs₂O₄).

https://doi.org/10.7186/bgsm48200424