The prospecting effect of rock debris measurement method in arid desert area: Exemplified by the discovery of the Galasitai scheelite deposit in northern Helan Mountain
Hua-Qi CHEN, Yong-Qin LI
The Second Institute of Geology and Mineral Exploration, Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou 730000, China
In the northern part of Helan Mountain, the structure is active and strong, the mid-acid intrusive rock is well developed, and the metallogenic exploration is favorable. The mineral prospecting indicators have rich information, suggesting a good gold and tungsten prospecting area. This area is characterized by arid low mountain and hilly desert geochemical landscape. The 1∶200,000 river sediment measurement work completed by the previous workers in this area is limited by unfavorable conditions such as sampling media, sample grain level, test equipment, and analysis methods, making the useful prospecting information weak. In this study, the chemical exploration work used an irregular network of 1∶50,000 rock debris measurement, -4 to +20 sampling grain meshes, and a C-layer working technical method in sampling layer, which led to the delineation of 30 comprehensive anomalies. There are 9 anomalies of Au, W, As, and Sn in the distribution area of the metamorphic rock in the second rock group in Yanqun area of Helan Mountain. Through anomaly verification, 14 new ore spots and mineralization spots were discovered, and 3 of them were identified. , In addition, 9 mineral target areas were selected through optimization. Thus, good ore prospecting results were obtained. For the first time, laminated scheelite was found in the silicified shallower part of the second group of Helan Mountain Rock Group. The significance of this discovery lies not only in the discovery of ore spots in the investigation area but also in the study of formation environment of known stratabound scheelite ore deposits in China. The orebodies were produced in the meso-deep horizons of metamorphic rocks and are characterized by stratiform or stratoid forms, which is very rare in the world.
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Hua-Qi CHEN, Yong-Qin LI. The prospecting effect of rock debris measurement method in arid desert area: Exemplified by the discovery of the Galasitai scheelite deposit in northern Helan Mountain. Geophysical and Geochemical Exploration, 2019, 43(1): 55-63.
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