A fluorite mine, working fluorite-quartz veins and fluorite veins, veinlets and stockworks, that are hosted in the Dongqiyishan porphyritic granitoid stock and surrounding marbles.

Dongqiyishan is the largest fluorite deposit in northwest China.

The Dongqiyishan deposit is a W-Sn-Mo-Be-Rb polymetallic and fluorite deposit discovered in the Beishan area, with reserves of 14,000 tons of tungsten (medium-sized), 3600 tons of molybdenum (small-sized), 28,000 tons of tin (medium-sized), 3600 tons of beryllium (small-sized), 4700 tons of rubidium (large-sized), and 520,000 tons of fluorite (large).
The Dongqiyishan deposit contains 71 orebodies of tungsten, tin, molybdenum, rubidium, beryllium, iron, and copper, mainly distributed in the southern and eastern outer contact zones of the Dongqiyishan intrusion, occurring as residual rings in hornfelsed tuffaceous sandstone, andesite, and skarn. Rubidium, beryllium, and tin mineralization are primarily distributed within the eastern complex.
The No.27 W-(Sn-Mo) orebody is the largest, striking east–west, dipping north, with a dip angle of 50~65°, length of 700 m, extension of 300~500 m, and thickness of 80~150 m. Tungsten ores are dominated by wolframite–quartz veins, wolframite-potassic-quartz veins and scheelite–sericite–quartz ± wolframite assemblage; molybdenum ores are observed to take place as molybdenite–quartz veins; cassiterite generally occurs as cassiterite–quartz veins. Metal minerals include wolframite, scheelite, cassiterite, molybdenite, and rutile. WO3, Mo, and Sn contents range from 0.1%~2.07%, 0.03%~0.13%, and 0.1%~4.71%, respectively. The No.52 Rb-Be orebody occurs as a lens in albitized granite, striking NE-SE, dipping north, with length 100~400 m, extension 50~250 m, and thickness 1~30 m. Beryllium-bearing minerals are beryl; rubidium-bearing minerals are lepidolite and sericite. BeO and Rb contents range from 0.1%~0.43% and 0.1%~0.21%, respectively.
Potassic–sodic alteration stage (Stage I—early W mineralization stage):
Phyllic alteration stage (Stage II—main W mineralization stage):
Quartz–fluorite–calcite stage (Stage III—post-W-mineralization hydrothermal stage):

Other Regions, Features and Areas containing this locality

References