Medium-scale porphyry Au deposit. There are two volcanic-intrusive series related to gold deposition in the area, the Mid Jurassic Tuntanying and the Early Cretaceous Jingouling volcanic-intrusive series. The mineral veins are controlled by faults and the orebodies are generally veined, and locally pancake-shaped. The deposit minerals exhibit idiomorphic-hypidiomorphic, xenomorphic granular, metasomatic, solid solution and colloid textures and occur in veinlets, disseminations, masses and brecciae. The centers of the orebodies are massive whereas their margins contain disseminations. Alteration includes silica alteration, beresite alteration, carbonate alteration, sericite alteration, propylitic alteration and alteration to zeolites and clay minerals. Deposition temperature is estimated at 150-440 °C and deposition pressure at 8.5 mPa. The deposit belongs to a transitional type between porphyry and epithermal deposits.
Ref.:
- http://wrgis.wr.usgs.gov/open-file/of03-220/DATABASE/lode_deposits.txt
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Map Reference: 43°7'45"N , 129°30'5"E
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