Dulanggou Au deposit, Xintaizi Au ore field, Danba Co., Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture), Sichuan, Chinai

Regional Level Types
Dulanggou Au deposit	Deposit
Xintaizi Au ore field	Ore Field
Danba Co.	County
Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture)	Prefecture
Sichuan	Province
China	Country

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All the 23 industrial ore bodies in the Dulanggou gold deposit are quartz vein ore bodies. There are four primary ore bodies that are closely controlled by three faults (F1, F2 and F3). These ore controlling faults strike at 325°∼30°, with dip angles of 45°∼90°. The ore bodies are found at elevations of 3480 ∼ 4290 m, and the majority of them have shapes of veins, lentoid, and echelon, with an overall westward dips ranging from 230° to 310° and steep dip angles ranging from 70° to 90°. According to the exploration data, the thickness of the main ore body ranges from 0.8 ∼ 27.3 m, with an average of 8.0 m. The gold grade after deducting the extra high grade is 2.6 ∼ 26.3 g/t, with an average of 7.0 g/t for the deposit. The total resources of the main ore body and various small ore bodies are estimated to be more than 50 t.
At Stage 1, pyrrhotite is the main ore mineral. Chalcopyrite is also found in trace amounts. Pyrrhotite commonly forms coarse grains as irregular clumps. Small amounts of chalcopyrite often occur around the periphery of pyrrhotite. Gold grains grow within pyrrhotite. There is a small quantity of gold deposition at this stage.

At Stage 2, various phases of Bi-Te minerals which occur in the fractures of Stage 1 quartz vein or replace Stage 1 pyrrhotite on the edges usually have large particle sizes, usually larger than 100 μm. A minor quantity of galena can dissolve out from the large patches of Bi-Te minerals.

At Stage 3, there are numerous varieties of Au-Bi-Te-(S) metal droplets, which consist of a bismuth-rich phase and gold-bearing phase. These metal droplets typically have particle sizes of 5 to 40 μm. The metal droplets usually occur as clusters or bands in quartz or quartz crystal fractures around Stage 2 coarse-grained Bi-Te minerals.

The Dulanggou gold deposit is exposed in the third (Dwg3) and fourth (Dwg4) members of the Devonian Weiguan Group. The third member (Dwg3) is the main exposed stratum in the study area and also the principal ore-hosting horizon in the mining district. It is composed mainly of garnet–sillimanite two-mica quartz schist intercalated with quartzite, with dolomitic marble locally developed at the top. A total of 29 economic orebodies have been delineated in the mining district, all of which are quartz-vein-type orebodies. Four major orebodies are present. The orebodies are strictly controlled by structures. It contains proven gold resources of 48 t with an average grade of 6.71 g/t, and is therefore classified as a large high-grade gold deposit. the mineralization stages of the Danba Dulanggou gold deposit are divided into the hydrothermal mineralization stage and the supergene oxidation stage. According to the paragenetic relationships among minerals, the hydrothermal mineralization stage is further subdivided into three substages: the early-stage quartz–minor sulfide substage (I), the main-stage quartz–abundant sulfide–native gold–tellurium–bismuth mineral substage (II), and the late-stage quartz–minor sulfide–calcite substage (III).

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

31 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded