Skarn and porphyry type copper-molybdenum deposit.

Exposed country rocks comprise Proterozoic dolomite and sandstone, Cambrian-Ordovician limestone, Jurassic volcanics, and Quaternary sediments. The mineralisation is structurally controlled by the NNE-trending Wulonggou-Shanghuangqi Fault, which is 2 km long, trends 5°–15°, and dips 50°–70° towards the SSE. The pluton consists of diorite, diorite porphyry, lamprophyre, and intermediate-felsic dykes. Two distinct mineralised zones, separated by strongly silicified rocks, include: (1) an upper porphyry Cu-Mo orebody with minor skarn Cu-Fe mineralisation, extending ∼200–850 m in depth, ∼900 m in length, 180–790 m in width, and 18–344 m in thickness; and (2) a lower skarn-dominated Cu-Mo zone and limited porphyry Cu-Mo mineralisation at a depth of ∼800–1300 m, a length of ∼400 m, a width of 460–700 m, and a thickness of 67–393 m. Orebodies (grading 0.26%–0.49% Cu and 0.04%–0.14% Mo) are hosted within diorite porphyry and adjacent skarns.

The strata exposed in this deposit mainly include the Proterozoic dolomite and sandstone, the Cambrian-Ordovician limestone, the Jurassic volcanic breccia, and the overlying Quaternary sediments. The NNE-trending Wulonggou-Shanghuangqi fault and its branches are the major ore-controlling structure. The magmatic rocks of this deposit consist mainly of andesite, intermediate-basic, lamprophyre and albitophyre dikes and diorite porphyry. The diorite porphyry stock shows a length of about 1 km and a width of about 0.4 km, with an area of about 1.5 km2. Most of diorite porphyry at earth surface was altered by propylitization, whereas those discovered in the center of concealed diorite porphyry stocks underwent beresitization. he orebodies are all concealed and hosted in diorite porphyry as well as skarn at contact zones between diorite porphyry and wall rocks, with average Cu grades of 0.26%–0.49% and Mo grades of 0.04%–0.14%. The orebodies occur as irregular lenticles, characterized by the NNE-trending strike, SE-trending inclination, with the dips of 52°–80°. These orebodies are divided into two ore belts in vertical direction. The upper ore belt is dominated by porphyry Cu-Mo ores and minor skarn Cu-Fe ores that are hosted at the depth of 200–850 m below the surface, with a length of about 900 m from south to north, a width of 180–790 m from east to west, and a thickness of 18–344 m (mean: 217 m). The lower ore belt is mainly represented by skarn Cu (Mo) ores and partial porphyry Cu or Cu-Mo ores which are discovered at the depth of 800–1300 m below the surface. The lower ore belt has a length of about 400 m, a width of 460–700 m, and a thickness of 67–393 m (mean: 248 m).

Other Regions, Features and Areas containing this locality

References