- Operaciones Metalurgicas S.A. (OMSA)
- Operaciones Metalurgicas S. A.-OMSA is the first tin smelter in Bolivia and strategically positioned within center of Bolivian Tin Belt. The located department Oruro 210 Km. south La Paz, major city seat government Bolivia. First Smelter was founded by Mariano Pero Aramayo, with introduction rotary ….
- Address:Calle Rene Moreno No.2-d, San Miguel
- Lee minerales
- Address:su1710
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