The 50 km2 Monywa copper district lies near the Chindwin River within the northward continuation of the Sunda-Andaman magmatic arc.
High-sulphidation epithermal copper deposit(s), hosted in a series of Cenozoic sedimentary clastic rocks and Late Miocenic felsic to intermediate volcanic rocks (andesite or dacite porphyry intrusions).
Most mineralization is structurally-controlled with digenite-chalcocite in breccia dykes, in steeply dipping NE-trending sheeted veins, and in stockwork and low-angle sulfide veins.
The mine was started in 1984 (1983 according to Mitchell et al. 2011, as a small open pit at Sabetaung), is owned by No. 1 Mining Corp. (sic) and operated by a 50/50 joint venture of Ivanhoe Mining and the military regime.
References
- Mining Annual Review (1985): 56 & 389.
- Khin Zaw, Peters, S.G., Cromie, P., Burrett, C., and Zengqian Hou (2007): Nature, diversity of deposit types and metallogenic relations of South China. Ore Geology Reviews 31, 3-47.
- Singer, D.A., Berger, V.I., and Moring, B.C. (2008): Porphyry copper deposits of the world: Database and grade and tonnage models, 2008. US Geological Survey Open-File Report 2008-1155.
- Mitchell, A.H.G., Myint, W., Lynn, K., et al. (2011): Geology of the High Sulfidation Copper Deposits, Monywa Mine, Myanmar. Resource Geology, 61, 1-29.
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