Linjia Au deposit (Linjiasandaogou Au deposit), Qingchengzi ore field, Fengcheng City, Dandong, Liaoning, Chinai

Regional Level Types
Linjia Au deposit (Linjiasandaogou Au deposit)	Deposit
Qingchengzi ore field	Ore Field
Fengcheng City	City
Dandong	Prefecture-level City
Liaoning	Province
China	Country

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The Linjiasandaogou gold deposit is hosted in the metaclastic sedimentary rocks of the Gaixian Formation and controlled by a NE-trending fault with low dip angles of 10°-30°. The deposit is located 3 km from the Baiyun deposit and the wallrock and mineralization features are similar to those of the Baiyun deposit.

The Linjia gold deposit, with 18 tons of gold at a total average Au grade of 4.08 g/t, is situated in the central part of the Qingchengzi ore field, adjacent to the NNW‑trending Jianshanzi fault. In addition to gold ores, the Linjia deposit also contains some economic silver ores with a reserve of 55.72 tons of Ag at 33.49 g/t. The Jianshanzi dextral strike-slip fault extends approximately 15 km in length and 10–20 m in width, with a dominant NW strike (295°–355°) and a NE dip of 60°–90°. It was intruded by Mesoproterozoic and Triassic intrusions, and underwent multiple episodes of deformation. The Jianshanzi fault is the main fault around the Linjia deposit. Paleoproterozoic biotite schist constitutes the principal exposed strata surrounding the Linjia gold deposit. Many Mesozoic granite and lamprophyre dikes intruded into the Paleoproterozoic biotite schist in the ore district. Sulfides occur as veinlets or disseminations in the Linjia ores. The Linjia deposit contains 11 identified gold orebodies, with the principal orebodies ranging from 30 to 600 m in length. The Au orebodies mainly occur as tabular or lenses with the dip angles varying between 10 and 30°. The thickness of gold orebody varies between 0.5 and 6.3 m, and with Au grades of 1.0–10.0 g/t and an average value of 4.08 g/t. Gold mineralization is accompanied by silicification, sericitization, and carbonatization.

The Linjiasandaogou deposit is primarily composed of altered-rock ores and quartz-vein ores, accounting for approximately 90% and 10% of the total ore volume, respectively (Yao et al., 2022). The altered-rock ores are widely distributed across the deposit and exhibit relatively low gold grades, with prominent alteration features including silicification, sericitization, and pyritization, accompanied by minor carbonatization. In contrast, the quartz-vein ores contain higher gold grades and are mainly present as sulfide-bearing quartz veins embedded within the altered-rock ores. A total of 17 ore bodies have been identified within the deposit, and these gold orebodies are primarily characterized by stratiform, stratiform-like, and vein-type occurrences, hosted in schists or leptynites of the Gaixian Formation, Liaohe Group. Orebody No. 5 extends approximately 1100 m in length, 990 m in width, and has an average thickness of 3.14 m, with an average gold grade of 3.79 g/t. This orebody strikes northwest at a bearing of 290° and dips toward the northeast or northwest at angles ranging from 1° to 19°.

Commodity List

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

Mineral List

16 valid minerals.

Rock Types Recorded