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Host Setting and Flotation of Au-, Ag- and Te-minerals in sulfide-rich Ore Lenses of the Kankberg Mine: Optical Microscopy | QEMSCAN Analysis | Bench Scale Flotation Tests
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2020 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Kankberg Au-Te mine is located in the eastern Skellefte field, a paleoproterozoic VMS district in northern Sweden. Brownfield exploration resulted in the discovery of new ore bodies that lie structurally above the present-day mine. These differ from the rest of the deposit in alteration style and sulfide content. Thin sections from two ore lenses were studied using optical microscopy and a QEMSCAN-device in order to understand the host setting of gold-, silver- and tellurium-minerals. Gangue is predominantly sericite - chlorite - quartz that fully overprinted the primary mineralogy. Pyrite and pyrrhotite are the main sulfide phases. Electrum and tellurides occur in two main host settings: (1) Quartz veins with a pyrrhotite - biotite - chlorite assemblage are host to telluride-only mineralization. (2) (Semi-) massive sulfide veins host both electrum and tellurides that overgrow pyrite or form free grains in the silicate gangue. In some few cases, Au and tellurides were found to form inclusions in pyrite grains. Subsequent bench scale flotation tests recovered ~ 68% Au, 62% Ag and 75% Te at concentrate grades of ~ 38, 55 and 1500 g/t, respectively, and proved high rejection of silicate gangue.

Place, publisher, year, edition, pages
2020. , p. 78
Keywords [en]
Gold, Tellurium, Tellurides, Skellefte District, Kankberg, QEMSCAN, Flotation, VMS
National Category
Geology
Identifiers
URN: urn:nbn:se:ltu:diva-76715OAI: oai:DiVA.org:ltu-76715DiVA, id: diva2:1370543
External cooperation
Boliden Mineral AB
Subject / course
Student thesis, at least 30 credits
Educational program
Geosciences, master's level (120 credits)
Presentation
2019-06-10, Luleå, 10:30 (English)
Supervisors
Examiners
Note

Endast sammanfattningen / abstract får publiceras!!

Available from: 2020-01-15 Created: 2019-11-15 Last updated: 2020-01-15Bibliographically approved

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  • apa
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Output format
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