Utilization and Effectiveness of Numerical Simulation Based on a Cold-Water Trapping Mechanism for Epithermal Gold Exploration

Utilization and Effectiveness of Numerical Simulation Based on a Cold-Water Trapping Mechanism for Epithermal Gold Exploration
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基于冷水捕获机制的数值模拟在浅成热液金矿勘探中的应用和有效性

DOI:
10.1007/s11053-022-10139-3
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发表时间:
2022
影响因子:
5.4
通讯作者:
Yoshiyama Hiroo
Yoshiyama Hiroo
中科院分区:
地球科学2区
文献类型:
--
作者:
Takahashi Hiroshi;Tomita Shohei Albert;Koike Katsuaki;Yoshiyama Hiroo

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低硫化浅成热液Au矿床的勘探预计将增加,因为这些矿床在经济上具有竞争力,在全球范围内发生,并且通过地下采矿产生的环境负荷较低。钻探是三维识别矿化带的主要勘探工具,然而,钻探目标的选择是勘探工作中的一个主要技术挑战。这一挑战可以通过有效地利用我们的概念模型的“冷水陷阱”,在浅层含水层中的冷地下水引起的矿床沉积机制来解决。在之前的两个低硫化浅成热液矿床的案例研究中,通过地质建模和数值模拟验证了这一机制,并在未钻探区域三维确认了潜在的矿化带。本文对数值模拟在浅成热液Au勘查中的应用进行了系统的总结,为浅成热液Au勘查新方法的应用提供了操作指南。在这种方法中,可以修改捕获方案,以探索不完全冷水捕获所产生的沉积物。因为该方法从获得地质建模所需数据的时间起有效地起作用,所以其适于在钻探勘探的时间内操作。此外,所提出的方法可以适用于布朗菲尔德勘探,如周围的现有矿床。敏感性分析表明,渗透率是最重要的参数的数值模拟。分析钻孔岩心的裂缝性质,如宽度和密度以及热液蚀变晕的程度,对于准确估计渗透率至关重要。
Exploration of low-sulfidation epithermal Au deposits is expected to increase because these deposits are economically competitive and globally occurring as well as produce low environmental load via underground mining. Drilling is the main exploration tool for identifying mineralized zones in three dimensions; however, selecting drill targets is a major technical challenge in exploration work. This challenge can be addressed by effectively employing our conceptual model of a “cold-water trap,” an ore-deposition mechanism induced by cold groundwater in shallow aquifer. In two previous case studies on low-sulfidation epithermal deposits, this mechanism was verified via geological modeling and numerical simulations, and potential mineralized zones were three-dimensionally confirmed in undrilled areas. Here, we methodize the utilization of numerical simulations for epithermal Au exploration and prepare the operational guidelines for a new exploration method. In this method, the trapping scenario can be modified to explore deposits generated by incomplete cold-water trapping. Because this method functions effectively from the time at which the necessary data for geological modeling are obtained, it is adapted to operate over the time of drill exploration. Furthermore, the proposed method can be adapted to brownfield explorations, such as around the existing deposits. Sensitivity analysis revealed permeability to be the most important parameter for the numerical simulation. Analyzing drill cores with respect to fracture properties such as width and density as well as the extent of the hydrothermal alteration halo is crucial for the accurate estimation of permeability.
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DOI: 10.11456/shigenchishitsu1951.33.237
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