Large Gold Deposit Discovered in Yumen, Gansu

On October 14, a reporter learned from the Gansu Provincial Department of Natural Resources that a large gold deposit has been newly discovered in the Qianhongquan–Heishan Beitan area of Yumen City, with newly added gold resources exceeding 40 tonnes, equivalent in scale to two large gold deposits.

According to the introduction, Gansu Province ranks second in China in gold resource reserves, and the Beishan metallogenic belt is an important concentration area for gold deposits in the province. To further tap the region's prospecting potential, the provincial Department of Natural Resources deployed the “1:50,000 Mineral Prospectivity Survey of the Qianhongquan–Heishan Beitan Area, Yumen City” project in 2017, laying the foundation for this discovery of a large gold deposit. After an in-depth analysis of the regional metallogenic geological setting, the Fourth Institute of Geological Exploration of the Gansu Provincial Bureau of Geology and Mineral Exploration (hereinafter the “Fourth Institute”) judged that the area had considerable gold prospecting potential and immediately organized an expert team to carry out exploration work, collecting a total of 6,177 stream sediment samples and delineating 16 composite anomalies with gold as the main indicator. In 2018, the exploration team discovered the Qianhongquan gold occurrence for the first time; from 2019 to 2020, through systematic exploration, the mineralized zone was traced and expanded to more than 10 kilometers, and several gold ore bodies reaching industrial grade were delineated; in 2021, on the basis of the work to extend the gold mineralized zone under the mineral prospectivity survey project, the Fourth Institute applied to expand the exploration area to 26.04 square kilometers, creating conditions for further in-depth exploration. Since the launch of the new round of the strategic action for prospecting breakthroughs, the provincial Department of Natural Resources has further increased exploration intensity and funding in the area. The general survey project of the Qianhongquan gold mine invested a total of RMB 76.28 million, completed 30,000 cubic meters of trenching and more than 35,000 meters of drilling, and ultimately newly discovered one gold mineralized zone. The mineralized zone is about 14 kilometers long and 10-100 meters wide, with newly added gold resources exceeding 40 tonnes.

The Qianhongquan gold deposit discovered this time is a large gold deposit found progressively through large-scale geochemical exploration on the basis of basic geological survey work. The result has important guiding significance for the search for gold deposits related to ductile shear zones in the southern Beishan belt of Gansu, and in particular provides practical experience that can be referenced for gold exploration in similar areas in terms of the choice of exploration methods, the organization of prospecting ideas and the assessment of directions. (Wang Yunxiang, Gansu Economic Daily, New Gansu)

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