A case study of Ca-rich fluid flow in Nimura Cu-Co mine. DRC, Central African Copperbelt

• Dieudonné Musuil ^[1]
  1. [1] Independant Exploration Geologist, Lubumbashi
• Localización: Carbonates and Evaporites, ISSN 0891-2556, Vol. 34, Nº. 3, 2019, págs. 731-741
• Idioma: inglés
• Enlaces
  • Texto completo
• Resumen

  • The Neoproterozoic Central African Copperbelt is the one of the largest sediment-hosted stratiform Cu–Co provinces in the world, with 140 Mt of copper and 6 Mt of cobalt, including several world-class deposits (P10 Mt copper). The Congo and Zambia stratiform deposits have characteristics indicating that syngenetic and early diagenetic processes have controlled the formation of the central Africa Neoproterozoic Copperbelt and studies related to diagenetic processes in sedimentary diagenetic processes where rocks triggered the diagenetic model for copper orebodies. For the dolomitic gangue major element concentrations associated with the second phase of the mineralization in the Nimura mine; the ore deposit has been determined and compared to those enriched, depleted than those, which would have remained immobile during the alteration processes. Moreover, it has been observed that FeO is often enriched, compared to SiO2, whose mass has been decreasing. The circulated fluid was almost carbonated, characterized by CaO, which has remained immobile during the alteration process. The Cu–Co mineralization is at least mainly based in the lower ore body, controlled by lithology, and tectonic. Gangue minerals are mostly dolomite and quartz with accessory Mg–chlorite and muscovite.