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| Primary halo zoning of No. 3 ore vein in the Gangcha gold deposit of Gansu and its ore-proepecting significance |
| BAO Lin1, SHEN Jun-Feng1, CAO Wei-Dong2, BO Hai-Jun1, LI Jin-Chun2, LI Ke1, WANG Jia-Xin1 |
1. China University of Geosciences, Beijing 100083, China;
2. Huitianran Mining Co., Ltd., Lanzhou 730000, China |
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Abstract Located in Luqu-Chengxian thrust nappe tectonic zone of Qinling orogenic belt, the Gangcha gold deposit is a typical tectonic alteration rock type gold deposit. The surface of the ore deposit controls five ore veins, which vertically extends for over 500 m, with their proven reserves reaching nearly 19 tons. Among them, the third vein is the largest gold vein, which extends almost in north-south direction, with an outcropped length of more than 1 km, an average grade of 2.99×10-6, and an average thickness of 2.91 m. Based on field investigation, the authors made an analysis of the geochemistry of various elements in relation to the ore veins. Combined with the association regularities of the general geochemical primary halo elements and the distribution characteristics of the single element contrast, the authors determined the element combination characteristics of No. 3 ore vein as follows: Au-Ag-Pb-Zn is the near-ore hole element association, Hg-As is the front halo element association, and Bi-Co-Cu-Ni is the rear halo element association. Based on the above element association characteristics, the authors analyzed the primary halo of the third vein, and the result shows that the characteristics of the axial zonation and superposition are obvious, the mineralization of the vein has southward characteristics, and the superimposed halo has not yet been closed in the extending direction. The authors thus infer that the good prospecting potential may exist in the southern depth of the ore deposit.
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Received: 29 September 2013
Published: 10 August 2014
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