Bulletin of the Geological Society of Malaysia, Volume 23, August 1989, pp. 121 – 132
1Geology Department, University of Tasmania, GPO Box 252C, Hobart, Tasmania 7001, Australia.
2Bugeco, C/O Dept. of Geology and Mineralogy, Royal Museum of Central Africa, B-1980 Turvuren, Belgium.
Abstract: The Phaungdaw Lead Prospect is situated at North Latitude 20°39‘ and East Longitude 96°19‘ in Pyawbwe Township, Mandalay Division, Burma. Lead mineralization occurs in the metasedimentary rocks of Phaungdaw Formation (Paleozoic). The ore minerals are strictly confined to the coarsely crystalline, white to bluish grey, thick-bedded marble unit of the Phaungdaw Formation and formed as parallel groups of stratiform lenses or layers of 1 to 2 meters across either conformable to the bedding of the host rock or along the crests of the minor folds. The ore assemblages are predominantly of galena with very little sphalerite, pyrite, chalcopyrite and tetrahedrite-tennantite. The gangues are mainly of quartz and calcite. Petrologic and mineralogic investigation of host rocks, ores and gangues indicates that the Phaungdaw area has suffered by a regional metamorphism. The ore assemblages were observed to have been affected by later metamorphism and deformation. In many respects, the Phaungdaw Lead Prospect is comparable to the Theingon deposit in the nearby Southern Shan State, Burma which have many similarities to the Mississippi Valley type deposits, but the Theingon deposit shows no sign of metamorphic effect and contains more Zn and Ag ore minerals.