This paper is the result of mineral exploration engineering.
[Objective]Beiya supergiant deposit (explored Au:151.28 t, Cu:0.2217 Mt)located in the large-scale Jinsha river-Red river tectonic-magma-metallogenic belt, which is the typical porphyry Au polymetallic deposit in the southeastern margin area of Sanjiang -Tethys metallogenic domain. For the past few years, the shallow geological structure and resources of the deposit have been preliminarily revealed. However, its deep geological structure, deep ore-controlling structure and deep ore prospecting potential are still unclear, which restricts the prospecting and discovery of deep orebody. [Methods]In this paper, the shallow spatial geological body at 1000 m of Wandongshan ore block of the Beiya gold polymetallic deposit is taken as the research object. We choosing the "block modeling method" and the "double-sided method" to establish 3 D visualization of Wandongshan ore block and orebody model of Au deposit by using the SKUA-GOCAD platform. Further, Kriging interpolation was employed to acquire grade distribution model of Au based on analytical of spatial variation distribution characteristics and analog variogram. [Results]In the light of grade distribution model and orebody model, 246 t gold resource was assessed. Meanwhile, a dominant Au-enrichment belt was revealed along the 40° direction of Wandongshan ore block. [Conclusions]Compared with the "slice method", the "double-sided method" can quickly and accurately establishes the three-dimensional model of the ore body. It is believed that the NE trending (40°) gold-grade preponderant enrichment zone is manifested in the shallow part of the hidden deep and large fault, which demonstrate Au is not only enrichment in the contact-alteration zone between intrusion and carbonate, but also concentrated in buried fracture at a certain distance from the intrusion, which is a favorable spots for future deep ore prospecting.
Highlights: Au resource was assessed in light of geological model which demonstrates tiny deviation (<10%) from reserve report; We speculate that there is a deep buried fracture in Wandongshan strike parallel to 40°(220°) which promise bright future for deep prospecting; The "double-sided method" is more suitable for complex layered precious metal modeling according to the outcome of orebody modeling in this paper.