Faculté des Sciences appliquées
Faculté des Sciences appliquées

Understanding the visible and invisible gold distribution in Certej (Romania) using Automated Mineralogy (Université de Liège)

Hughes, Laura Coleman ULiège
Promotor(s) : Pirard, Eric ULiège
Date of defense : 25-Aug-2017 • Permalink :
Title : Understanding the visible and invisible gold distribution in Certej (Romania) using Automated Mineralogy (Université de Liège)
Author : Hughes, Laura Coleman ULiège
Date of defense  : 25-Aug-2017
Advisor(s) : Pirard, Eric ULiège
Committee's member(s) : Marion, Philippe 
Nguyen, Frédéric ULiège
Language : English
Number of pages : 138
Keywords : [en] Certej, gold deportment, refractory gold, invisible gold, gravity recoverable gold, Knelson Concentrator, geometallurgy
Discipline(s) : Engineering, computing & technology > Geological, petroleum & mining engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil des mines et géologue, à finalité spécialisée en "geometallurgy (EMERALD)"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] This study focuses on the Kaiser Vein system in the West Zone of the Certej (Romania) epithermal gold deposit, a trend hosting a large portion of refractory gold in pyrite-arsenopyrite veins, but showing potential to host localizations of free gold in quartz and carbonate veins. The study begins with petrographical characterization of the ore through core logging and optical microscopy, where the ore is sub-divided into three primary domains. This is followed by an evaluation of the ore’s amenability to the current sulfide flotation scheme, where the metallurgical results are analyzed in conjunction with optical microscopy analysis, element to mineral conversions, and a gold distribution analysis to quantify to different types of gold present. As a significant portion of gold lost to the tailings was estimated to be non-refractory in nature, a standardized ‘Gravity Recoverable Gold’ test (Laplante 1998) was used on West Zone samples to assess their amenability to a gravity recovery stage. Testing was done with a laboratory-scale Knelson concentrator, and analysis done on the products included size-by-size chemical assay, optical analysis, element to mineral conversions, and gold distribution analysis. Based on the samples tested, the majority of the West Zone ore is thought to contain very little gravity recoverable gold, with only localized concentrations of ore showing reasonable amenability to gravity concentration.



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  • Hughes, Laura Coleman ULiège Université de Liège > Master ingé. civ. mines & géol., à fin. (EMERALD)


Committee's member(s)

  • Marion, Philippe Université de Lorraine > Ecole Nationale Supérieure de Géologie > Laboratoire Georessources
  • Nguyen, Frédéric ULiège Université de Liège - ULg > Département ArGEnCo > Géophysique appliquée
    ORBi View his publications on ORBi
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