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黄金科学技术 ›› 2023, Vol. 31 ›› Issue (6): 888-899.doi: 10.11872/j.issn.1005-2518.2023.06.059

• 矿产勘查与资源评价 • 上一篇    下一篇

赣东北银山矿田铜矿石中伴生金赋存状态研究

吴荔1(),匡文龙1(),张志辉2,陈健龙3,张跃权1,刘兆阳1,黄英剑1   

  1. 1.湖南科技大学地球科学与空间信息工程学院,湖南 湘潭 411201
    2.江西铜业集团银山矿业公司,江西 德兴 334200
    3.长春黄金研究院有限公司,吉林 长春 130012
  • 收稿日期:2023-04-20 修回日期:2023-08-20 出版日期:2023-12-31 发布日期:2024-01-26
  • 通讯作者: 匡文龙 E-mail:1404122672@qq.com;kuangwenlong2002@sina.com
  • 作者简介:吴荔(1998-),女,江苏南通人,硕士研究生,从事矿产普查研究工作。1404122672@qq.com
  • 基金资助:
    江西铜业集团科研项目“银山矿区九区—西山区铜矿石中伴生金赋存状态与分布规律研究”(YSYJ2022001)

Study on the Occurrence State of Associated Gold in Copper Ores of Yinshan Ore Field in Northeastern Jiangxi

Li WU1(),Wenlong KUANG1(),Zhihui ZHANG2,Jianlong CHEN3,Yuequan ZHANG1,Zhaoyang LIU1,Yingjian HUANG1   

  1. 1.School of Earth Science and Space Information Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
    2.Yinshan Mining Company, Jiangxi Copper Group, Dexing 334200, Jiangxi, China
    3.Changchun Gold Research Institute Co. , Ltd. , Changchun 130012, Jilin, China
  • Received:2023-04-20 Revised:2023-08-20 Online:2023-12-31 Published:2024-01-26
  • Contact: Wenlong KUANG E-mail:1404122672@qq.com;kuangwenlong2002@sina.com

摘要:

银山多金属矿田可划分为铜和铅锌2个成矿系列。为深入了解银山矿田铜矿石中伴生金的赋存状态和主要矿石矿物的工艺特性,在实地考察和室内测试的基础上,采用岩矿鉴定和扫描电镜等技术手段,对银山矿田九区—西山区铜矿石工艺矿物学特性进行了研究。结果表明:金矿物赋存状态以包裹金(46.41%)为主,其次为粒间金(44.17%)和裂隙金(9.42%)。金矿物粒度以微粒金(94.61%)为主,辅以少量细粒金和中粒金,尚未发现粗粒金和巨粒金。金矿物中Au元素含量为75.87%~95.68%,Ag元素含量为4.32%~24.13%,Ag和Au元素含量比值为0.05~0.32。银山矿田金矿物以银金矿为主,含有少量自然金,金平均成色达到843.7。通过梳理伴生金的赋存状态,有助于优化矿石选矿流程,从而提高金的回收率,增加矿山经济效益。

关键词: 赋存状态, 铜矿石, 伴生金, 工艺矿物学, 银山矿田, 赣东北

Abstract:

It has an excellent metallogenic geological conditions in northeast Jiangxi Province,and large ore fields such as Dexing,Lehua and Yinshan have been discovered successively.Among them,the Yinshan polymetallic ore field can be divided into two metallogenic series of copper and lead-zinc.In order to deeply understand the occurrence state of associated gold in Yinshan copper ore and the process characteristics of main ore minerals,on the basis of field investigation and laboratory experiments,the process characteristics of copper ore minerals represented by Jiuqu-Xishan district from Yinshan ore field were studied by the methods such as rock-mineral identification and scanning electron microscopy.The results show that the intercalation state of gold minerals is dominated by wrapped gold(46.41%),followed by intergranular gold (44.17%) and fissure gold(9.42%).The particle size of gold minerals is dominated by fine-grained gold(94.61%),supplemented by a small amount of fine-grained gold and medium-grained gold.Coarse-grained gold and giant-grained gold have not been found yet.The content of gold(Au)in gold minerals is 75.87%~95.68%,the content of silver(Ag)is 4.32%~24.13%,the content ratio of Ag and Au is 0.05~0.32.The gold minerals are mainly silver-gold,less natural gold,the average fineness of gold is 843.7.The natural gold in copper ore is usually golden yellow,and its fineness range is 936.4~956.8,with an average of 946.6.The silver-gold ore in copper ore is usually brass-colored,and the fineness range is 758.7~839.9,with an average of 809.4.The gold-bearing minerals in the copper ore are mainly chalcopyrite,tennantite,pyrite,and some are associated with gangue minerals.By clarifying the occurrence status of associated gold, it is helpful to optimize the ore beneficiation process,so as to improve the recovery rate of gold and enhance the economic benefits of the mine.

Key words: occurrence state, copper ore, associated gold, process mineralogy, Yinshan ore field, northeastern Jiangxi

中图分类号: 

  • P618.51

图1

银山矿田构造地质图(修改自陈雅萍,2020)1.英安斑岩;2.爆破角砾岩;3.石英斑岩;4.铜矿体;5.铅锌(银)矿体;6.不整合界线;Q-第四系;K1s-下白垩统石溪组;K1d3-下白垩统打鼓顶组上部火山熔岩和火山碎屑岩;K1d2-下白垩统打鼓顶组中部集块角砾岩;K1d1-下白垩统打鼓顶组下部千枚质砾岩夹砂岩;Pt3z-新元古界张村岩组"

图2

银山矿田九区、西山区-578 m水平断面图(修改自刘金刚等,2019)"

图3

银山矿田主要矿石矿物特征(a)、(b)黄铜矿包裹黄铁矿;(c)黄铁矿呈细脉网状分布在黄铜矿中;(d)黄铜矿呈固溶体分离结构嵌布在闪锌矿中;(e)、(f)砷黝铜矿包裹毒砂;(g)砷黝铜矿以不规则状与黄铁矿密切共生;(h)黄铁矿与黝铜矿关系密切;Py-黄铁矿;Ccp-黄铜矿;Tnt-砷黝铜矿;Apy-毒砂;Bn-斑铜矿;Thr-黝铜矿;Sp-闪锌矿"

表1

银山矿田铜矿石光谱分析结果"

元素含量元素含量
Al6.51Sr0.0209
As0.156Th0.0056
Ca0.299Ti0.237
Cu1.03V0.0072
Fe11.5Na0.212
K1.72Ni0.0045
Mg0.309P0.066
Mn0.007Pb0.01
Rb0.042W0.348
S10.6Zn0.0266
Sb0.0314Zr0.0084
Si18.3

图4

银山矿田铜矿石中金的产出状态(a)、(b)、(c)包裹金;(d)、(e)、(f)粒间金;(g)裂隙金;(h)金的赋存方式;Au-自然金;Ccp-黄铜矿;Tnt-砷黝铜矿;Apy-毒砂;Py-黄铁矿"

图5

银山矿田铜矿石中金粒级分布"

图6

银山矿田典型金矿物扫描电镜能谱分析(a)银金矿(Au:82.79%;Ag:17.21%);(b)银金矿(Au:83.99%;Ag:16.01%);(c)银金矿(Au:82.91%;Ag:17.09%);(d)银金矿(Au:80.25%;Ag:19.75%);(e)自然金(Au:95.68%;Ag:4.32%);(f)自然金(Au:93.64%;Ag:6.36%);(g)银金矿(Au:75.87%;Ag:24.13%);(h)银金矿(Au:79.83%;Ag:20.17%)"

图7

银山矿田载金矿物扫描电镜元素面扫描分析(a)、(b)黄铜矿(绿色)包裹自然金(红色);(c)、(d)自然金(红色)赋存在砷黝铜矿(绿色)裂隙中;(e)、(f)自然金(红色)赋存在砷黝铜矿(绿色)裂隙中;(g)、(h)、(i)自然金(红色)表面附着黄铁矿(绿色)、石英(蓝色)"

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