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Deep prospecting prediction using integrated geochemistry and wide field electromagnetic method in the Zaozigou Gold Deposit, Gansu

  • English Author:
  • Zhu Rui¹,², Luan Xiaogang², Nie Xin³, Wu Tonglin², He Yongcheng², Yu Haocheng¹

  • Unit:
  • (1. School of Earth Sciences and Resources, China University of Geosciences, Beijing; 2. Gansu Hezuo Zaozigou Gold Mine Co., Ltd.; 3. Zhaojin Mining Industry Co., Ltd.)
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Abstract:

The Zaozigou Gold Deposit is one of the largest gold deposits in the Western Qinling orogenic belt.However, as mining depth increases, exploration becomes increasingly challenging. Despite the significant deepresource potential, the spatial distribution of deep orebodies remains poorly understood. This study conducts deepmetallogenic prediction and delineates prospective targets in the Zaozigou Gold Deposit through the integration ofgeochemistry and wide field electromagnetic method. Trace element characteristics of rock samples from a representativeexploration profile indicate that As exhibits the strongest correlation with Au, followed by Sb, suggesting that arsenopyriteand stibnite are the minerals most closely associated with gold mineralization. These 2 minerals show a somewhatcomplementary relationship—arsenopyrite is less developed where stibnite is abundant, and vice versa. Arsenopyrite islikely the main carrier of Au, while the presence of stibnite enhances Au enrichment. Comprehensive analysis ofore⁃forming element distribution maps and wide field electromagnetic interpretation sections reveals a strong couplingbetween abrupt resistivity changes and orebody distribution. The highest potential for ore occurrence lies near resistivitydiscontinuities, especially at the intersections of 2 sets of resistivity break lines. Based on these results, 5 favorableexploration zones of 3 levels were delineated along the GY3 profile. First⁃level targets are located at intersections of majormineralized structures with pronounced lateral resistivity gradients near surface; second⁃level targets lie at intersectionsof significant lateral and vertical resistivity anomalies; and third⁃level targets are situated at deeper structural positions,similar to those hosting previously discovered blind orebodies(M4, M6), and are associated with moderate lateralresistivity gradients. These favorable zones are likely to extend laterally to adjacent profiles, providing guidance fordelineating prospective targets in nearby sections.

Keywords:

Zaozigou Gold Deposit; wide field electromagnetic method; geochemistry; resistivity; deep prospecting;target delineation; Western Qinling