Panshi nephrite deposit, Panshi City, Jilin, Jilin, Chinai

Regional Level Types
Panshi nephrite deposit	Deposit
Panshi City	City
Jilin	Prefecture-level City
Jilin	Province
China	Country

It lies in the southeastern segment of the Jilin–Heilongjiang fold system (sub-Ⅰ), the Jilin eugeosyncline fold belt (Ⅱ), the Jilin syncline (Ⅲ), and the Panshi–Shuangyang fold belt (Ⅳ). Three main stratigraphic units crop out in the Quanling area: (i) Upper Carboniferous–Permian sedimentary rocks, (ii) Jurassic–Cretaceous volcanic-sedimentary sequences, and (iii) discontinuous Quaternary surficial deposits. Historically, the Panshi deposit has been predominantly mined for diopside, which has led to an underestimation of its nephrite potential. However, the deposit is now recognized for its high-quality nephrite and ease of extraction, with confirmed reserves exceeding 170,000 t. The deposit consists of two orebodies located approximately 100 m apart. The No. II orebody is concealed beneath Quaternary sediments, while the No. I orebody trends north to south and dips westward at angles between 60° and 80°. It measures 300 m in length, 200 m in width, and plunges to a depth of up to 340 m. A band of dark-green, actinolite-altered syenogranite, 10–100 m wide, separates the nephrite orebody from the surrounding rock. The calcite–tremolite zone comprises a mix of lenticular tremolite aggregates and marble, displaying hues that contrast with the adjacent nephrite and carbonate wall rock.
Panshi deposit reveal six mineral assemblage zones: syenogranite, actinolite-altered syenogranite, diopside–tremolite, nephrite, calcite–tremolite, and dolomitic marble. Immediately adjacent to the intrusive contact lies a 5–10 m inner selvage of actinolite‑altered syenogranite; where alteration is most intense, this zone may widen to as much as 50–60 m (locally ≤ 100 m). This grades outward into 10–25 m of diopside–tremolite skarn. Nephrite lenses occur 20–40 m from the contact, locally reaching 25 m in thickness and persisting at least 80 m down‑dip. Beyond the nephrite zone, calcite–tremolite assemblages occupy a band roughly 40–60 m from the intrusion, and dolomitic marble dominates at distances greater than 60 m.

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References