Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing
The Björkdal gold deposit is situated in the Skellefte mining district, northern Sweden. The ore is mined from a complex system of quartz veins ranging from a few cm to a meter in width. The mineral processing steps at Björkdal comprises a flotation circuit, which performance is dependent on the pH...
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Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser
2021
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ftluleatu:oai:DiVA.org:ltu-86424 2023-05-15T17:44:24+02:00 Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing Ekholm, Niklas 2021 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86424 eng eng Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86424 info:eu-repo/semantics/openAccess Björkdal gold deposit gold pH QEMSCAN mineralogy ore Environmental Engineering Naturresursteknik Student thesis info:eu-repo/semantics/bachelorThesis text 2021 ftluleatu 2022-10-25T20:57:41Z The Björkdal gold deposit is situated in the Skellefte mining district, northern Sweden. The ore is mined from a complex system of quartz veins ranging from a few cm to a meter in width. The mineral processing steps at Björkdal comprises a flotation circuit, which performance is dependent on the pH of the ore feed. A total of ten samples from five different ore zones from the underground development was investigated with the purpose of improving the understanding of factors that causes the pH value of rock samples to vary which is deleterious to the metal recovery. The samples were investigated with optical microscopy together with scanning electron microscopy (SEM) and automated mineralogy (QEMSCAN) to carry out the modal mineralogy. The analyses identified a total of 37 different minerals in the samples. Chlorite was identified with significantly higher values in parts of the investigated ore zones and especially in the sample with the highest pH value, suggesting chlorite-hosting shear zones that crosscut the sampled ore zones to be a contributing factor that could be affecting the elevated pH values, resulting in a decreased recovery of gold. Bachelor Thesis Northern Sweden Luleå University of Technology Publications (DiVA) |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
Björkdal gold deposit gold pH QEMSCAN mineralogy ore Environmental Engineering Naturresursteknik |
spellingShingle |
Björkdal gold deposit gold pH QEMSCAN mineralogy ore Environmental Engineering Naturresursteknik Ekholm, Niklas Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing |
topic_facet |
Björkdal gold deposit gold pH QEMSCAN mineralogy ore Environmental Engineering Naturresursteknik |
description |
The Björkdal gold deposit is situated in the Skellefte mining district, northern Sweden. The ore is mined from a complex system of quartz veins ranging from a few cm to a meter in width. The mineral processing steps at Björkdal comprises a flotation circuit, which performance is dependent on the pH of the ore feed. A total of ten samples from five different ore zones from the underground development was investigated with the purpose of improving the understanding of factors that causes the pH value of rock samples to vary which is deleterious to the metal recovery. The samples were investigated with optical microscopy together with scanning electron microscopy (SEM) and automated mineralogy (QEMSCAN) to carry out the modal mineralogy. The analyses identified a total of 37 different minerals in the samples. Chlorite was identified with significantly higher values in parts of the investigated ore zones and especially in the sample with the highest pH value, suggesting chlorite-hosting shear zones that crosscut the sampled ore zones to be a contributing factor that could be affecting the elevated pH values, resulting in a decreased recovery of gold. |
format |
Bachelor Thesis |
author |
Ekholm, Niklas |
author_facet |
Ekholm, Niklas |
author_sort |
Ekholm, Niklas |
title |
Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing |
title_short |
Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing |
title_full |
Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing |
title_fullStr |
Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing |
title_full_unstemmed |
Mineralogical characterization of oresamples of different pH in the Björkdal golddeposit, northern Sweden – implications formineral processing |
title_sort |
mineralogical characterization of oresamples of different ph in the björkdal golddeposit, northern sweden – implications formineral processing |
publisher |
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser |
publishDate |
2021 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86424 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86424 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766146612392886272 |