Analysis of favorable areas for mineralization

1. The structure-mineralization "three-story" pattern composed of the Dadu River gold field and its peripheral gold deposits provides a theoretical basis for mineralization prediction. In the direction of prospecting, in addition to paying full attention to the "small but rich" quartz vein type gold deposits, we must strengthen the research and search for other types of gold deposits, especially the quartz vein-altered rock type gold deposits, although they may be relatively poor. , but the ore body is relatively stable and is very likely to be medium-sized or above. At present, there are many prospecting clues for this type of gold mine. If conditions permit, breakthroughs can be made in the deep prospecting process, and this type of gold deposit can be found, it will change the "outstanding" situation of the Huanghuangping gold mine.

Research on gas-liquid inclusions in the Sandiao mining area shows that the mineralization is related to deep hydrothermal fluids, and the mineralization has obvious dizziness characteristics, which are characteristics of upper mineralization, indicating that the mineralization will become better in depth. The pyrite form, morphology and thermal electromotive force characteristics of Huangjinping indicate that the ore body has not been fully exposed, and it is speculated that there are still industrial ore bodies in the depths (Cao Zhimin, 1991). Huangjinping mine is equivalent to the transitional type gold mine between "Linglong style" and "Jiaojia style" in Zhaoyuan area, Shandong. If comparisons can be made, the prospects for deep prospecting are great.

2. Through the analysis of geology, geophysical prospecting, remote sensing and gold mineralization, the favorable sections of the Dadu River gold ore field are relatively clear, that is, the three important NNE trending faults/fissures mentioned above are densely populated. Belts: Huangjinping-Paijintaizi belt, Guangjinba-Yinchangping belt and Duifanggou-Naha belt (Figure 4-2). They are all ore-controlling structural belts and geochemical anomaly areas for gold and related elements (Figures 5-3 and 5-4). A series of gold deposits and mineral spots distributed in bands have been discovered. This "trinity" feature is a distinctive sign of a favorable location in a gold mining field. In addition, the mineral belts and deposits (points) are clearly equidistant, providing a reference coordinate for mineralization prediction.

Among these three zones, 10 mineral spots can be selected as prospecting target areas for further work. Preliminary work shows that these deposits and points all have ore-bearing structures and pyritization-silicification-sericitization-carbonatization wall rock alteration. Ore bodies or mineralized bodies have initially appeared, and they have the potential for ore prospecting and development. "One-stop" conditions.

In addition, the Qianxi Gaojiajianzi newly discovered during the work is a quartz vein-altered rock type gold deposit with a gold grade of 23-2g/t. It has industrial significance and good prospects and is worth further research. Work.

Fig.5-3 Distribution of major gold deposits (spots) in Daduhe gold orefield

Fig.5-3 >1—shear zone; 2—fracture; 3—schistosity; 4—ore-bearing structure; 5—tensile lineation; 6—mylonitization; 7—linear structure; 8—different structures in the basement complex system Boundary line of layers; 9—dyke; 10—quartz vein-altered rock type gold deposit (bed); 11—quartz vein type gold deposit (bed); 12—prospective gold deposit; 13—gold deposit ; 14—Gold element anomaly contours

Figure 5-4 Geochemical anomaly map of associated elements in Daduhe gold mine

Fig.5-4　Anomaly of associated elements in Daduhe glod orefield

The legend for 1~13 is the same as Figure 5-3; 14 - mercury abnormal contour; 15 - arsenic abnormal contour; 16 - lead abnormal contour; 17 - zinc abnormal contour ; 18-Antimony abnormal contours

Area I is characterized by As, Hg, and Zn; Area II is characterized by Hg, Pb, and Sb

Figure 5-5 Lan'an Gold Abnormal area schematic map

Fig.5-5 Au anomaly schematic map in Nan'an

l—Au anomaly isoline; 2—Mercury anomaly isoline; 3— Abnormal contours of arsenic element; 4—Known rock gold deposit points; 5—Known placer gold deposit points

3. The understanding of the Dadu River gold ore field can be extended to adjacent areas, especially gas The area south of the ditch and east of the Changchang Fault Zone. They are also the distribution areas of Kangding complex, which are comparable to the Dadu River gold field.

The "Lan'an Anomaly" is worth noting. Its northwest is connected to the "Wasigou Anomaly" and is very eye-catching on the anomaly distribution map (Figure 5-5). The north side of the "Gasgou anomaly" is the Zhuangshang mineral point, which has a tendency to extend southward. However, there is no corresponding mineral point for the "Lan'an anomaly". The reason is that the Lan'an area is a Quaternary coverage area, and the anomaly may migrate due to the influence of the terrain. Tracing back to the source, the inferred primary ore body may be in the mountainous area on the eastern edge of the anomaly. Checking the satellite images, linear structures in the NNE direction and alteration halos can be seen. Comparing the conditions of the Dadu River gold field, it is possible to find quartz vein and altered rock type gold deposits, which are worthy of attention.