The Helong ore field, with W–Sn reserves of 15,000 tons and 9500 tons, respectively. The Helong orefield is located in Jiangxi Province, South China; geologically, the orefield is located in the Nanling tungsten belt. The Nanling tungsten belt overlaps the EW-trending Nanling Range, which is composed of the Yuecheng, Doupang, Mengzhu, Qitian, and Dayu mountain belts that separate the Yangtze River and Zhujiang River systems. Except for some scattered Late Triassic deposits, Late Jurassic deposits are the main W and Sn deposits in the Nanling tungsten belt. Most granites in the region were formed coevally with the Late Jurassic W–Sn deposits, which occurred at a peak of ca. 160 to 150 Ma.
The Helong orefield is hosted in the junction of the E-W-trending complex structure belt of the middle and eastern Nanling region and the NNE-SSW-trending Wuyi uplifted zone. Stratigraphic sequences exposed in the orefield include Chinese stage for the Sinian to Cambrian marine clastic rocks that are low-grade metamorphosed and extremely thick, Devonian to Permian marine to continental clastic and carbonate rocks, and Jurassic to Tertiary continental clastic rocks. Mesozoic granites are dominant in the orefield, including the Dabu composite pluton, and many minor intrusions such as the Tieshanlong, Anqiantan, Jinzhuping, and Changkeng granites. These igneous rocks were mainly intruded during two periods, i.e., the Caledonian (ca. 423–430 Ma) and the Late Mesozoic (ca. 161–153 Ma). The W-polymetallic ore deposits associated with the Late Jurassic granites, which take the form of quartz vein, porphyry, skarn, and greisen type, are the Laikeng, Tongziping, Niushikeng, Changkeng, and Jinzhuping deposits. Importantly, the Jinzhuping and Changkeng granites have been associated with the W-dominant deposits in time, space, and genesis in the Helong orefield.

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