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Gold Science and Technology >

2022 , Vol. 30 >Issue 3: 352 - 365

DOI: https://doi.org/10.11872/j.issn.1005-2518.2022.03.018

Mineral Exploration and Resource Evaluation

Ore-controlling Effect of Structural Geometry Features in the Sanshandao Gold Belt，Jiaodong Peninsula，China： Insights from Numerical Simulation

  • Lingzhi ZHONG , 1, 2 ,
  • Xiancheng MAO , 1, 2 ,
  • Zhankun LIU 1, 2 ,
  • Keyan XIAO 3 ,
  • Chuntan WANG 1, 2 ,
  • Wu CHEN 1, 2
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  • 1. School of Geosciences and Info-physics, Central South University, Changsha 410083, Hunan, China
  • 2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Ministry of Education), Central South University, Changsha 410083, Hunan, China
  • 3. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received date: 2022-01-07

  Revised date: 2022-04-06

  Online published: 2022-09-14

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Highlights

The morphology，amounts and location of orebodies in the Sanshandao gold belt，Jiaodong Peninsula are closely related to fault.The orebodies are mostly hosted by the fault parts with the characteristics of gentle or dip changing from gentle to steep.In oder to explore the control effect of fault geometry on gold mineralization，the geological model （e.g.，fault zone，orebodies，wall rocks and cover） of the Sanshandao belt was constructed，and the numerical simulation was carried out by FLAC3D software.The simulation results show that the corners of the Sanshandao fault are prone to accumulate greater shear strain （up to 8% than wall rocks） and volumetric strain （up to 2% than wall rocks） in the striking direction，where occurs an expansion space. This results in the formation of local thick gold orebodies at the corner where with a included acute angle of the fault and the NE-SW principal compressive stress.In terms of the dip direction，the gentle parts where the fault zone changes from steep （dip angle greater than 60°） to gentle （dip angle in 30°~40°） occur the dialation （volume strain：1%~2%），while the steep parts occur the compression characteristics （volume strain：-1%~0）. This differential stress distribution at different dip parts controls the discontinuous and intermittent distribution of orebodies along the dip direction.From a view of 3D，the ore-forming fluids in the Xinli segment，southern part of the Sanshandao belt，migrates from the SE areas at depth to NW at shallow，while the Sanshandao，Xiling，and Beibuhaiyu segments show a trend of flowing from NE to SW.This difference in fluid flow direction may be attributed to the bending fault intersurface formed by the co-operative deformation in strike and dip directions at Xinli controlling the SE dipping of the expansion zone.Therefore，the SE areas at depth in the Xinli segment，and the NE areas at depth in Sanshandao and Xiling segment have the good metallogenic potential.

Cite this article

Lingzhi ZHONG , Xiancheng MAO , Zhankun LIU , Keyan XIAO , Chuntan WANG , Wu CHEN . Ore-controlling Effect of Structural Geometry Features in the Sanshandao Gold Belt，Jiaodong Peninsula，China： Insights from Numerical Simulation[J]. Gold Science and Technology, 2022 , 30(3) : 352 -365 . DOI: 10.11872/j.issn.1005-2518.2022.03.018

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亚洲第一深矿井（山东黄金三山岛副井）井筒下掘连续3个月突破百米大关

自2022年5月以来，亚洲第一深矿井——山东黄金三山岛副井井筒掘进已连续3个月突破百米大关，创造了大直径井筒掘进的“黄金速度”。

三山岛副井井筒下掘工程被列入年度重点工程，致力于打造精品工程，严格落实主要负责人现场办公和项目负责人制，全面筹划、组织、指挥、协调工程施工。同时，调集专业骨干组建强有力的项目管理团队，通过现场盯靠、校企联合等方式，实时解决工程施工中的技术瓶颈，为快速施工提供了保障。

通过使用大型化、高端化装备保障施工安全高效，制作国内首个Ⅷ型凿井井架，井筒内布置2套滚筒Φ5.0 m缠绕式单钩提升系统，配置20台稳车的悬吊系统，其中9台50T稳车为国内首秀。搅拌系统采用全电脑一键启动操作，可根据工艺流程进行智能搅拌，在保证搅拌高精准度的同时，极大地缩短了各个工序的施工时间。

在项目建设过程中，山东黄金集团还建立了立井施工信息化平台，及时收集提升机、供电系统及入井人员信息等数据，实时监控施工现场各系统运行状态，远程发现和诊断设备故障，实现了立井施工信息化、智能化管理，大幅提高了设备使用效率。

山东黄金集团有限公司

http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-3-352.shtml

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