Contemporaneous formation of vein-hosted and stratabound gold mineralization at the world-class Dead Bullock Soak mining camp, Australia

Laura Petrella, Nicolas Thébaud, Crystal LaFlamme, John Miller, Christopher McFarlane, Sandra Occhipinti, Stephen Turner, Stuart Perazzo

Research output: Contribution to journalArticle

Abstract

We investigate the relative and absolute timing associated with the formation of the world-class Dead Bullock Soak (DBS) mining camp. The study area is situated in the Paleoproterozoic Granites-Tanami Gold Province in the Northern Territory, Australia, and consists of five orogenic gold deposits, including the Callie deposit with a resource of 14.2 Moz Au. At DBS, the ore is hosted in Paleoproterozoic metasedimentary rocks and consists of two contrasting styles of mineralization, vein-hosted and stratabound. The vein-hosted mineralization consists of visible gold in quartz, chlorite, carbonate veins preferentially hosted in finely laminated, decarbonized siltstones. In contrast, the stratabound mineralization consists of free gold associated with arsenopyrite concentrated in bedding-parallel sulfide-rich layers, hosted in iron-rich siltstones. This study combines structural and petrographic analysis with detailed U–Pb geochronological data on hydrothermal and metamorphic xenotime and monazite to constrain the relative and isotopic timing of ore formation in the DBS mining camp. The results of this study show that both mineralization styles developed within a series of NE-trending and SE-dipping vein corridors or structural pathways, associated with the development of axial planar fabric related to small-scale F2 folds. U–Pb geochronology shows that both mineralization styles formed at c. 1805 Ma, approximately 35 m.y. after peak metamorphism at c. 1840 Ma. A post-mineralization hydrothermal event is locally remobilizing gold and yields an age of c. 1790 Ma, which provides a minimum age for gold deposition.

Original languageEnglish
Pages (from-to)1-18
JournalMineralium Deposita
DOIs
Publication statusE-pub ahead of print - 10 Jun 2019

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veins
Gold
gold
mineralization
Ores
siltstone
Geochronology
Gold deposits
deposits
time measurement
minerals
Quartz
Carbonates
xenotime
Sulfides
geochronology
corridors
arsenopyrite
metasedimentary rock
monazite

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@article{4df342ad78db44b997dee7da460e4c10,
title = "Contemporaneous formation of vein-hosted and stratabound gold mineralization at the world-class Dead Bullock Soak mining camp, Australia",
abstract = "We investigate the relative and absolute timing associated with the formation of the world-class Dead Bullock Soak (DBS) mining camp. The study area is situated in the Paleoproterozoic Granites-Tanami Gold Province in the Northern Territory, Australia, and consists of five orogenic gold deposits, including the Callie deposit with a resource of 14.2 Moz Au. At DBS, the ore is hosted in Paleoproterozoic metasedimentary rocks and consists of two contrasting styles of mineralization, vein-hosted and stratabound. The vein-hosted mineralization consists of visible gold in quartz, chlorite, carbonate veins preferentially hosted in finely laminated, decarbonized siltstones. In contrast, the stratabound mineralization consists of free gold associated with arsenopyrite concentrated in bedding-parallel sulfide-rich layers, hosted in iron-rich siltstones. This study combines structural and petrographic analysis with detailed U–Pb geochronological data on hydrothermal and metamorphic xenotime and monazite to constrain the relative and isotopic timing of ore formation in the DBS mining camp. The results of this study show that both mineralization styles developed within a series of NE-trending and SE-dipping vein corridors or structural pathways, associated with the development of axial planar fabric related to small-scale F2 folds. U–Pb geochronology shows that both mineralization styles formed at c. 1805 Ma, approximately 35 m.y. after peak metamorphism at c. 1840 Ma. A post-mineralization hydrothermal event is locally remobilizing gold and yields an age of c. 1790 Ma, which provides a minimum age for gold deposition.",
keywords = "Callie deposit, Epigenetic gold, Granites-Tanami Gold Province, Monazite, Orogenic gold, U–Pb geochronology, Xenotime",
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Contemporaneous formation of vein-hosted and stratabound gold mineralization at the world-class Dead Bullock Soak mining camp, Australia. / Petrella, Laura; Thébaud, Nicolas; LaFlamme, Crystal; Miller, John; McFarlane, Christopher; Occhipinti, Sandra; Turner, Stephen; Perazzo, Stuart.

In: Mineralium Deposita, 10.06.2019, p. 1-18.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Contemporaneous formation of vein-hosted and stratabound gold mineralization at the world-class Dead Bullock Soak mining camp, Australia

AU - Petrella, Laura

AU - Thébaud, Nicolas

AU - LaFlamme, Crystal

AU - Miller, John

AU - McFarlane, Christopher

AU - Occhipinti, Sandra

AU - Turner, Stephen

AU - Perazzo, Stuart

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N2 - We investigate the relative and absolute timing associated with the formation of the world-class Dead Bullock Soak (DBS) mining camp. The study area is situated in the Paleoproterozoic Granites-Tanami Gold Province in the Northern Territory, Australia, and consists of five orogenic gold deposits, including the Callie deposit with a resource of 14.2 Moz Au. At DBS, the ore is hosted in Paleoproterozoic metasedimentary rocks and consists of two contrasting styles of mineralization, vein-hosted and stratabound. The vein-hosted mineralization consists of visible gold in quartz, chlorite, carbonate veins preferentially hosted in finely laminated, decarbonized siltstones. In contrast, the stratabound mineralization consists of free gold associated with arsenopyrite concentrated in bedding-parallel sulfide-rich layers, hosted in iron-rich siltstones. This study combines structural and petrographic analysis with detailed U–Pb geochronological data on hydrothermal and metamorphic xenotime and monazite to constrain the relative and isotopic timing of ore formation in the DBS mining camp. The results of this study show that both mineralization styles developed within a series of NE-trending and SE-dipping vein corridors or structural pathways, associated with the development of axial planar fabric related to small-scale F2 folds. U–Pb geochronology shows that both mineralization styles formed at c. 1805 Ma, approximately 35 m.y. after peak metamorphism at c. 1840 Ma. A post-mineralization hydrothermal event is locally remobilizing gold and yields an age of c. 1790 Ma, which provides a minimum age for gold deposition.

AB - We investigate the relative and absolute timing associated with the formation of the world-class Dead Bullock Soak (DBS) mining camp. The study area is situated in the Paleoproterozoic Granites-Tanami Gold Province in the Northern Territory, Australia, and consists of five orogenic gold deposits, including the Callie deposit with a resource of 14.2 Moz Au. At DBS, the ore is hosted in Paleoproterozoic metasedimentary rocks and consists of two contrasting styles of mineralization, vein-hosted and stratabound. The vein-hosted mineralization consists of visible gold in quartz, chlorite, carbonate veins preferentially hosted in finely laminated, decarbonized siltstones. In contrast, the stratabound mineralization consists of free gold associated with arsenopyrite concentrated in bedding-parallel sulfide-rich layers, hosted in iron-rich siltstones. This study combines structural and petrographic analysis with detailed U–Pb geochronological data on hydrothermal and metamorphic xenotime and monazite to constrain the relative and isotopic timing of ore formation in the DBS mining camp. The results of this study show that both mineralization styles developed within a series of NE-trending and SE-dipping vein corridors or structural pathways, associated with the development of axial planar fabric related to small-scale F2 folds. U–Pb geochronology shows that both mineralization styles formed at c. 1805 Ma, approximately 35 m.y. after peak metamorphism at c. 1840 Ma. A post-mineralization hydrothermal event is locally remobilizing gold and yields an age of c. 1790 Ma, which provides a minimum age for gold deposition.

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KW - Granites-Tanami Gold Province

KW - Monazite

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KW - U–Pb geochronology

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