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Core Viewpoint - A large gold mine has been discovered in the Qianhongquan area of Yumen, Gansu Province, with an additional gold resource of over 40 tons, equivalent to the resource amount of two large gold mines [1][4]. Summary by Sections Discovery and Resource Estimation - The newly discovered gold mine in the Qianhongquan-Heishan Beitan area has an estimated gold resource of over 40 tons, which is significant for the region [1][4]. - Gansu Province ranks second in gold resource reserves in China, with the Beishan mineralization belt being a key area for gold deposits [3]. Exploration Efforts - The Gansu Provincial Natural Resources Department initiated a mineral prospecting project in 2017 to explore the potential of the Qianhongquan-Heishan Beitan area, laying the groundwork for the discovery of this large gold mine [3]. - The Gansu Geological Exploration Institute conducted extensive geological analysis and sampling, collecting 6,177 sediment samples and identifying 16 comprehensive anomalies with gold as a primary indicator [3]. Investment and Methodology - Since the implementation of a new round of mineral exploration strategies, the Gansu Provincial Natural Resources Department has increased investment and exploration efforts in the area, with a total funding of 76.28 million yuan for the Qianhongquan gold mine survey project [4]. - The exploration efforts included 30,000 cubic meters of trenching and over 35,000 meters of drilling, leading to the discovery of a gold mineralization belt approximately 14 kilometers long and 10-100 meters wide [4].