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  • CN 62-1112/TF 
  • ISSN 1005-2518 
  • Founded in 1988
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Mining Technology and Mine Management

Process Mineralogy of Quartz Vein Gold Ore in Bamian,Laos

  • Cailian GUO ,
  • Fangyin NIU ,
  • Binglong CHEN ,
  • Haijun WANG
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  • Xi’an Northwest Geological Institute of Nonferrous Metals,Xi’an 710054,Shaanxi,China

Received date: 2020-03-11

  Revised date: 2021-01-07

  Online published: 2022-03-07

Abstract

The technological type of ore in Bamian,Laos is low sulfide and quartz vein gold ore among which the main recycled element is gold with the grade of 42×10-6.The process mineralogy of gold ore was researched by microscope identification,SEM observation,MLA analysis,EDS analysis and multi-element chemical analysis.In order to find out the occurrence state of gold and provide process mineralogy data support and theoretical basis for the subsequent process design of beneficiation.The results show that:(1)The precious metal mineral is natural gold,which is the main recovered element.The main non-metallic minerals are quartz and plagioclase,the main metallic minerals are pyrite and arsenopyrite,followed by sphalerite.(2)A total of 165 natural gold particles were found in the ore,and the gold minerals are mainly natural gold which average purity is 905.09‰.The shape of natural gold is complex,mainly for the horn-granular and long-granular.The grain size of natural gold is coarser,which included 79.84% of visible gold,and 20.16% of micro gold.(3)The occurrence types of gold included 52.67% of fissure gold,40.33% of intergranular gold and 7.00% inclusion gold.(4)The main gold bearing minerals are arsenopyrite,pyrite,sphalerite,quartz and tourmaline,which closely symbiosis.The occurrence state of gold shows that the main natural gold is fissure gold and intergranular gold,the total of which is 93.00%.Moreover,the granularity of fissure gold and intergranular gold is relatively coarse.Usually the gold in this ore is easy to liberate.The arsenic in gold concentrage will exceed the standard because of the arsenopyrite is the main gold bearing mineral and arsenic bearing mineral. Through the unite gravity-flotation separation process,the gold recovery can reach to 95.5% under the grinding fineness of -0.074 mm 75%.The results of this study have found out the occurrence state of gold,filled in the blank of process mineralogy of quartz vein type gold ore and provided the basis for the process design of beneficiation.

Cite this article

Cailian GUO , Fangyin NIU , Binglong CHEN , Haijun WANG . Process Mineralogy of Quartz Vein Gold Ore in Bamian,Laos[J]. Gold Science and Technology, 2021 , 29(6) : 908 -916 . DOI: 10.11872/j.issn.1005-2518.2021.06.058

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