金属砂矿勘查中基本分析项目与地质品位的确定--讨论及建议  

Determination of basic analysis items and geological grade in the exploration of metal placers:discussions and suggestions

作　　者：阚靖 赵京涛[1,2] 宋维宇 黄龙[1,2] 武复宇 张勇[1,2] KAN Jing;ZHAO Jingtao;SONG Weiyu;HUANG Long;WU Fuyu;ZHANG Yong(Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,Shandong,China;Laboratory for Marine Mineral Resources,Qingdao Marine Science and Technology Center,Qingdao 266237,Shandong,China)

机构地区：[1]青岛海洋地质研究所,山东青岛266237 [2]青岛海洋科技中心海洋矿产资源评价与探测技术功能实验室,山东青岛266237

出　　处：《矿产与地质》2024年第5期939-948,共10页Mineral Resources and Geology

基　　金：海洋地质调查项目(DD20243114)资助。

摘　　要：基本分析项目与地质品位的确定是金属砂矿勘查中基础且重要的环节,对我国金属类砂矿开发与利用产生直接影响。我国现有砂矿地质品位确定方法存在一定差异性,模糊性或矛盾性,对这些重要问题进行讨论是有必要的。本文以多年来滨浅海金属类砂矿调查经验为基础,结合前人研究成果,介绍目前勘查中砂矿品位的主流表示与计算方法,分析其优缺点,继而提出面向新一轮找矿突破要求的改进方法并探讨其可行性。结果表明:金属砂矿勘查品位确定应遵循与时俱进、正确对待误差、综合评价原则,并寻求勘查成本与勘查风险的最佳结合点。建议不采用传统重矿物淘洗+鉴定方法作为基本分析获得矿物品位,推荐视勘查阶段、勘查主要目的、勘查类型灵活选用重矿物含量(THM%)测定、化学分析法换算、自动矿物分析(如MLA)3种方法作为基本分析项目。圈定矿体的边界品位与最低工业品位可直接利用“重矿物含量”或采用“综合圈矿指标”。应选取重点研究区,将其与传统方法进行对比研究与验证,同时对砂矿勘查技术规范体系相关内容进行广泛深入讨论,寻求共识,以求加快补充修订。The determination of basic analysis items and geological grade is the basic and important link in the exploration of metal placer,which has a direct impact on the development and utilization of metal placer in China.There are some differences,fuzziness or contradiction in the existing methods for determining the geological grade of sand deposits in China.It is necessary to discuss these important issues.Based on the investigation experience of coastal and shallow sea metal placer deposits for many years,combined with previous research results,this paper introduces the mainstream expression and calculation methods of placer grade in current exploration,analyzes its advantages and disadvantages,and then puts forward the improvement method for the new round of prospecting breakthrough requirements and discusses its feasibility.The results show that the determination of exploration grade of metal placer should follow the principles of keeping pace with the times,correctly treating errors and comprehensive evaluation,and seek the best combination of exploration cost and exploration risk.It is suggested that the traditional heavy mineral elutriation and identification method should not be used as the basic analysis method to obtain mineral grade.It is recommended that the determination of heavy mineral content(THM%),chemical analysis method conversion and automatic mineral analysis(such as MLA)should be flexibly selected as the basic analysis items according to the exploration stage,the main purpose of exploration and the type of exploration.The cut-off grade and minimum industrial cut-off grade used to delineate the ore body can be directly determined using"heavy mineral content"or using"comprehensive zoning indicators".Key research areas should be selected and compared with the traditional methods,the research and verification are carried out.At the same time,the relevant contents of the technical specification system of sand exploration are discussed extensively and deeply,and the consensus is sought in order to spe

关 键 词：金属砂矿 滨海砂矿 重矿物 基本分析项目 地质品位 

分 类 号：P624[天文地球—地质矿产勘探] P618.2[天文地球—地质学]