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Bainiuchang super-large silver-polymetallic ore deposit related to granitic magmatism in Mengzi, Yunnan

  • Liu Ji-shun  (刘继顺)Email author
  • Zhang Hong-pei  (张洪培)
  • Ouyang Yu-fei  (欧阳玉飞)
  • Zhang Cai-hua  (张彩华)
Article

Abstract

Bainiuchang silver-polymetallic ore deposit is located in the southeast Yunnan tin-polymetallic metallogenic belt. The probable reserves and inferred resources of the deposit are of 6 470 t Ag and 1.10 Mt Pb and 1.72 Mt Zn and 86 kt Sn. Orebodies of the deposit occur in clastic-carbonate rocks of Tianpeng Formation and Longha Formation of the middle Cambrian System above the Bainiuchang concealed granite of the late Yanshan period. The concealed granite has the characteristics of tin-bearing granites. Abundance of the mineralization elements Sn, Cu, Zn, Pb, Ag and Sb is high in the granitic rocks. Sulphur isotope data of the metal sulphides indicate that most sulphur is derived from the magmas. The ores are similar in rare earth element(REE) patterns to the granitic rocks. The granitic magma activity results in ore-bearing structures. Rocks of the Middle Cambrian System above the concealed intrusion suffer from skarnization, hornfelsing, marbleization, siliconizing and carbonatization. The mineralization elements Sn, Cu, Zn, Pb, Ag and Sb successively appear from the top of the granite to surrounding rocks. These evidences indicate that the granitic magmatism is the principal mineralization factor. The opinion that the south Bainiuchang ore field and the north Awei ore block are tin and copper potential exploration areas was put forward and was verified by drilling tests.

Key words

Bainiuchang super-large silver-polymetallic deposit granite granitic-porphyry tin ore 

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Copyright information

© Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  • Liu Ji-shun  (刘继顺)
    • 1
    Email author
  • Zhang Hong-pei  (张洪培)
    • 1
    • 2
  • Ouyang Yu-fei  (欧阳玉飞)
    • 1
  • Zhang Cai-hua  (张彩华)
    • 2
  1. 1.School of Geoscience and Environmental EngineeringCentral South UniversityChangshaChina
  2. 2.Mengzi Minning and Metallurgy Co. Ltd.YunnanChina

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