Carlin-type gold deposit with ultra-high grade. The mining area has been divided into four ore blocks, Shuiyindong, Xionghuangyan, Bojitian, and Nayang. ca. 265 t Au @11 g/t

It is divided from west to east into seven mining sections: West Mining Section, Middle Mining Section, East Mining Section, Xionghuangyan, Bojitian, Nayang, and Zhexiang #2. The deposit has yielded proven reserves of 308 t with an average gold grade of 5 g/t. Currently, the deposit remains at the peripheral and deep prospecting stage. The exposed and drilled rock strata include massive bioclastic limestone of Maokou Formation (P2m), coal-bearing fine clastic rock (e.g., argillite and siltstone) interbedded with bioclastic limestone of Longtan Formation (P3l), bioclastic limestone interbedded with argillite of Changxing Formation (P3c), argillite intercalated with bioclastic limestone lenses of Dalong Formation (P3d), marlstone and argillite of Yelang Formation (T1y), and dolomite and limestone of Yongningzhen Formation (T1yn). Gold mineralization is preferentially disseminated within the bioclastic limestone of P3l and brecciated carbonate developed along the unconformity interface between P2m and P3l. The Au orebodies in the SGD occur within ∼1000 m on both limbs of the Huijiabao anticline and are mainly found in the P3l and SBT. More than 300 orebodies have been identified in the SGD, including 25 orebodies with a gold resource exceeding 1 t. According to the occurrence, morphology, and ore-controlling structures of the orebodies, they can be classified into two types: fault-controlled and strata-controlled, with the latter being the dominant type. The ores can be classified into carbonates (approximately 60 %), breccias (approximately 30 %), and calcareous sandstones (approximately 5 %). Three distinct stages: (1) The early-ore stage (quartz-dolomite) is primarily characterized by pervasive metasomatism with extensive silicification; (2) The main-ore stage (Au0-pyrite-arsenopryite-quartz) features the development of concentrically zoned arsenian pyrite and euhedral arsenopyrite, with quartz occurring as veinlets; (3) The late-ore stage (realgar-orpiment-stibnite-cinnabar-quartz-calcite) is dominated by filling calcite, accompanied by stibnite, cinnabar, realgar, and orpiment.

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References