Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada
The Valentine Lake Property in southwestern Newfoundland has five known gold deposits over a distance of 20 km along a northeast to southwest trend and is expected to be the future site for the largest gold mine in Atlantic Canada. The property contains structurally controlled orogenic-type quartz-t...
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fterudit:oai:erudit.org:1106344ar 2024-01-21T10:08:15+01:00 Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada Flanagan, Marie Leitch, Alison Wall, Adam 2023 http://id.erudit.org/iderudit/1106344ar https://doi.org/10.4138/atlgeo.2023.008 en eng Atlantic Geoscience Society Érudit Atlantic Geoscience : Journal of the Atlantic Geoscience Society vol. 59 (2023) http://id.erudit.org/iderudit/1106344ar doi:10.4138/atlgeo.2023.008 All Rights Reserved ©, 2023Atlantic Geoscience text 2023 fterudit https://doi.org/10.4138/atlgeo.2023.008 2023-12-24T00:13:37Z The Valentine Lake Property in southwestern Newfoundland has five known gold deposits over a distance of 20 km along a northeast to southwest trend and is expected to be the future site for the largest gold mine in Atlantic Canada. The property contains structurally controlled orogenic-type quartz-tourmaline-pyrite veins, which are gold-bearing, occurring along or proximal to the Valentine Lake Shear Zone. The mineralization is found mostly on the northwest side of the shear zone in intrusive rocks and is rare in the conglomerate on the southeast side. The area has many mafic dykes, which show up well when conducting a magnetic survey due to their magnetite content. These dykes, like the mineralization, occur mainly in the intrusive rocks and trend predominantly subparallel to the shear zone, and so can help indicate structure. To constrain the location of the shear zone (and hence the mineralized region) in an area where an offset was suspected, a detailed magnetic survey was conducted over a 200 m x 300 m grid comprising sixteen lines. With the collected data, residual magnetic intensity maps were created and processed. A region was identified where the pattern of linear magnetic highs weaken and appear to terminate near the suspected offset. In combination with drill core information, this location is interpreted as a fault offset of the shear zone. The loss in magnetic intensity is possibly due to alteration or thinning of the mafic dykes near the fault. La propriété du lac Valentine dans le sud-ouest de Terre-Neuve abrite cinq gîtes aurifères connus sur une distance de 20 km le long d’un axe du nord-est au sud-ouest et on anticipe qu’elle constituera l’emplacement de la plus vaste mine d’or au Canada atlantique. La propriété recèle des filons de quartz-tourmaline-pyrite orogéniques régis par la structure le long ou à proximité de la zone de cisaillement du lac Valentine. La minéralisation est principalement présente sur le flanc nord-ouest de la zone de cisaillement dans des roches intrusives et elle est ... Text Newfoundland Terre-Neuve Érudit.org (Université Montréal) Canada Valentine ENVELOPE(-54.550,-54.550,-61.083,-61.083) Atlantic Geoscience 59 165 181 |
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Open Polar |
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Érudit.org (Université Montréal) |
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fterudit |
language |
English |
description |
The Valentine Lake Property in southwestern Newfoundland has five known gold deposits over a distance of 20 km along a northeast to southwest trend and is expected to be the future site for the largest gold mine in Atlantic Canada. The property contains structurally controlled orogenic-type quartz-tourmaline-pyrite veins, which are gold-bearing, occurring along or proximal to the Valentine Lake Shear Zone. The mineralization is found mostly on the northwest side of the shear zone in intrusive rocks and is rare in the conglomerate on the southeast side. The area has many mafic dykes, which show up well when conducting a magnetic survey due to their magnetite content. These dykes, like the mineralization, occur mainly in the intrusive rocks and trend predominantly subparallel to the shear zone, and so can help indicate structure. To constrain the location of the shear zone (and hence the mineralized region) in an area where an offset was suspected, a detailed magnetic survey was conducted over a 200 m x 300 m grid comprising sixteen lines. With the collected data, residual magnetic intensity maps were created and processed. A region was identified where the pattern of linear magnetic highs weaken and appear to terminate near the suspected offset. In combination with drill core information, this location is interpreted as a fault offset of the shear zone. The loss in magnetic intensity is possibly due to alteration or thinning of the mafic dykes near the fault. La propriété du lac Valentine dans le sud-ouest de Terre-Neuve abrite cinq gîtes aurifères connus sur une distance de 20 km le long d’un axe du nord-est au sud-ouest et on anticipe qu’elle constituera l’emplacement de la plus vaste mine d’or au Canada atlantique. La propriété recèle des filons de quartz-tourmaline-pyrite orogéniques régis par la structure le long ou à proximité de la zone de cisaillement du lac Valentine. La minéralisation est principalement présente sur le flanc nord-ouest de la zone de cisaillement dans des roches intrusives et elle est ... |
format |
Text |
author |
Flanagan, Marie Leitch, Alison Wall, Adam |
spellingShingle |
Flanagan, Marie Leitch, Alison Wall, Adam Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada |
author_facet |
Flanagan, Marie Leitch, Alison Wall, Adam |
author_sort |
Flanagan, Marie |
title |
Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada |
title_short |
Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada |
title_full |
Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada |
title_fullStr |
Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada |
title_full_unstemmed |
Finding fault in a shear zone: A magnetic and drill core study in the Valentine Lake Property, Newfoundland, Canada |
title_sort |
finding fault in a shear zone: a magnetic and drill core study in the valentine lake property, newfoundland, canada |
publisher |
Atlantic Geoscience Society |
publishDate |
2023 |
url |
http://id.erudit.org/iderudit/1106344ar https://doi.org/10.4138/atlgeo.2023.008 |
long_lat |
ENVELOPE(-54.550,-54.550,-61.083,-61.083) |
geographic |
Canada Valentine |
geographic_facet |
Canada Valentine |
genre |
Newfoundland Terre-Neuve |
genre_facet |
Newfoundland Terre-Neuve |
op_relation |
Atlantic Geoscience : Journal of the Atlantic Geoscience Society vol. 59 (2023) http://id.erudit.org/iderudit/1106344ar doi:10.4138/atlgeo.2023.008 |
op_rights |
All Rights Reserved ©, 2023Atlantic Geoscience |
op_doi |
https://doi.org/10.4138/atlgeo.2023.008 |
container_title |
Atlantic Geoscience |
container_volume |
59 |
container_start_page |
165 |
op_container_end_page |
181 |
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1788698909597499392 |