基于Vulcan软件的山东莱州留村金矿区三维建模及资源量估值北大核心CSCD

留村金矿位于山东莱州市城区西南12 km的留村断裂带上,是发育于古老变质岩中的小型石英脉型金矿。为深入研究该矿区地层、构造与矿体在地下的延伸分布情况,加快后续数字化矿山建设,山东黄金集团应用Vulcan矿业软件对矿区开展三维地质建模。在收集相关地质实物资料的基础上,通过建立地质数据库、数据转换、地质解译等系列功能操作建立了矿区地表、岩体、构造及矿体模型,并对其进行任意剖割划分,实现了矿区地层岩性、地质构造、矿体的三维可视化,促进了本区矿体赋存规律的研究以及三维空间的成矿预测。同时利用软件强大的数据处理功能对资源量进行估值,本次估值的金资源量为1984.18 kg,与原详查报告中提交的金资源量2009.34 kg误差仅为1.25%。经估值后的每个矿块段都被赋予了精确的资源量数据,为后续矿山采矿设计与排产计划提供了准确的数据支撑,助力实现数字化、智能化矿山建设。

3D modeling based on Vulcan software and resource estimation for the Liucun gold deposit in Laizhou, Shandong Province

In recent years, many metal deposits have been discovered around the Fengning-Longhua fault zone in the Chengde area, Heibei Province, such as the Yantongshan-Dengxi mine district containing 18 zinc, 5 gold and 2 silver orebodies. The purpose of this work is to clarify further prospecting direction and improve the ore-search effect in this mine area. We analyze the regional geological characteristics, ore controlling geological factors, deposit features, genesis and development stages of this zinc polymetallic mine, summarize its distribution regularity, and put forward the understanding of the genesis and prospecting direction of the deposit. It is considered that these metal deposits are closely related to tectonic movement, especially the development of fault zones. Magmatic activity is the driving source of mineralization, and hydrothermal, alteration and mineralization are the same process in this area. From Archean to Mesozoic, three groups of nearly EW-, NE- and NW-trending faults with different properties and scales were formed by multiple stages of geological processes such as thrusting and napping in Early Cretaceous and extensional deformation in Middle Cretaceous, which provided favorable metallogenic conditions for Zn and Pb. The Dabeigou Formation (K1d) of lower Cretaceous Luanping Group in Mesozoic is exposed in the Fengning-Longhua fault zone and its south, with intermediate acid and alkaline continental pyroclastic rocks, breccia and tuff. The weak zone between strata is an important metallogenic space. The main fault F2 in the area belongs to the Wenjiagou-Dongshan fault zone, which is a main ore controlling structure of lead polymetallic deposits in this area, so can be regarded as a main prospecting direction. Gaoyuzhuang Formation (Chg) of the Proterozoic Changcheng System is a coastal facies sedimentary stratum mainly composed of magnesium-rich carbonate, composed of siliceous dolomite and carbonaceous argillaceous dolomite, which is a major ore-controlling wall rock. The difference coefficient of Ag in dolomite is 6.0, indicating a prospecting direction of silver orebodies. In the future prospecting work, our attention should focus on the discovery of structural markers, with faults as the main prospecting direction. At the same time, attention should also be paid to the discovery of magmatic rocks, alteration zone marks and geochemical anomalies, so as to improve the prospecting effect.