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Hanshan |
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Gansu, China |
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Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Hanshan gold deposit is situated in Anxi County, 130 km SE of Dunhuang City, and ~350 km NNE of the city of Golmud, in Gansu Province of western China, between the Qaidarn basin to the southwest and Qilianshan Mountains to the northeast (#Location: 39° 54' 25"N, 96° 25' 47"E).
The district geology comprises Ordovician metasedimentary and metavolcanic rocks in an area of high relief and the severe weather conditions. Gold ore occurs in both quartz veins and as disseminations in wall rocks.
The deposit lies on the northwestern margin of the Qilianshan fold belt in a WNW-trending shear zone that is a 15 km long and 400 m wide subsidiary structure of the Altunshan strike-slip fault system.
The mineralised zones, which are hosted within Ordovician andesites and basalts, are 1500 m long and as much as 1 to 15 m thick, with a WNW trend and a dip of 50 to 70°W.
Three types of primary ore have been recognised: i). early-stage quartz-sericite-pyrite ores in stockworks; ii). early-stage disseminated ore; and ii). the most important, late-stage quartz - calcite-sulphide veins.
The ore system is characterised by variable degrees of potassic and silicic alteration. Late-stage gold-related fluid inclusions have homogenisation temperatures between 170 to 310°C, with a peak around 260°C and low salinities. Pyrite is the dominant sulphide mineral, with a gangue of predominantly quartz, calcite and muscovite. The upper 50 m of the ore zone has been oxidised to a yellow sandy gossan composed of jarosite, gypsum and relict quartz.
Age determinations on two samples of muscovite (K-Ar) from the disseminated ores are about 214 and 224 Ma.
The deposit has published resources of >60 t of contained gold at grades of 3 to 5 g/t Au.
The most recent source geological information used to prepare this decription was dated: 2002.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
Hanshan
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Jingwen Mao, Zhang Zuoheng, Yang Jianmin and Zhang Zhaochong 2000 - The Hanshan gold deposit in the Caledonian North Qilian orogenic belt, NW China: in Mineralium Deposita v35 pp 63-71
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