3D visualization modeling and application study of porphyry-skarn gold-copper deposits in Beiya Area, Yunnan Province
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摘要:
研究目的 位于金沙江-红河巨型构造-岩浆成矿带中段的北衙超大型矿床（已探明金151.28 t，铜22.17万t），是三江特提斯成矿域东段典型的斑岩-矽卡岩型金多金属矿床。近年来，矿床浅部地质结构与资源状况已得到初步揭示，但是其深部地质结构、深部控矿构造及深部找矿潜力还不清楚，制约了深部的找矿发现。
研究方法 本研究以北衙金多金属矿床万硐山矿段1000 m以浅空间地质体作为研究对象，采用SKUA-GOCAD平台，选择"分块建模法"和"双面法"建立了万硐山矿段三维地质模型和金矿体模型；在此基础上，通过分析金元素空间变化特征，模拟变差函数，采用克里金插值法（Kriging）建立了规模矿体品位模型。
研究结果 结合品位模型和矿体模型，估算金矿资源量约为246 t，同时金元素品位空间分布显示沿万硐山矿段40°方向存在一条优势富集带。
结论 "双面法"相比"切片法"能快速准确地建立矿体三维模型；认为北东向（40°）金品位优势富集带为隐伏深大断裂浅部表现，金元素不仅在岩体与碳酸盐接触蚀变带中富集，也在距离岩体一定距离的隐伏断裂中富集，为未来深部找矿有利方向。
Abstract: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.
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图 1 北衙金矿大地构造位置（据Wang et al., 2014修改）
Figure 1.
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