Tectonics and metallogeny of Archean crust in the Abitibi-Kapuskasing-Wawa region

Heather, K B; Percival, J A; Moser, D.; Bleeker, Wouter

doi:10.4095/205285

Cited by 7 publications

(7 citation statements)

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“…The Borden gold deposit is located 160 km south-west of Timmins, in the Wawa Subprovince of the Archean Superior Province. The gold deposit occurs in the west trending Borden Lake greenstone belt, in the southern portion of the Kapuskasing Structural Zone [73][74][75][76]. The Borden Lake greenstone belt, which has undergone high-grade metamorphism (up to granulite facies), consists of mafic to ultramafic gneisses, pillow basalts, felsic meta-volcanic rocks, felsic porphyries, and tonalites that are overlain by a >30 m thick suite of Timiskaming-aged clastic metasedimentary rocks [77][78][79][80].…”

Section: Study Areamentioning

confidence: 99%

“…If gold grains are scattered in a homogeneous medium (a till in a specific sampling site), the probabilities of occurring in an aliquot (sample) follows a Poisson distribution (or binomial distribution if using a limited number of aliquots). Hence, the probability of having a certain grain in a sample equals the probability of having any other grains in the same sample [76,90] and is equal to the probability of having this specific grain in another aliquot. This means that the number of grains present in a set of samples taken from a homogeneous site will differ from samples to samples in a predictable manner according to the mass function.…”

Section: Benefit Of Improving the Countsmentioning

confidence: 99%

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Automated Gold Grain Counting. Part 1: Why Counts Matter!

Girard¹,

Trembaly²,

Néron³

et al. 2021

Preprint

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The quantitative and qualitative assessment of gold grains from samples of glacial till is a well-established method for exploring gold deposits hidden under glaciated cover. This method, widely used by the industry and which produced numerous successes in locating gold deposits in glaciated terrain, is still based on artisanal gravity separation techniques and visual identification. However, being artisanal, it is limited by inconsistent recoveries and the difficulty to visually identify the predominantly occurring small gold grains. These limitations hinder its capability to deceipher subtle or complex signal. To improve detection limits through recovery of small gold grains, a new approach has recently been introduced in the industry (commercially referred as “ARTGold” procedure) using an optimized miniature sluice box coupled with an automated scanning electron microscopy routine. The capabilities of this improved method are highlighted by comparing till surveys conducted around the Borden gold deposit (Ontario, Canada) using the conventional and improved methods at both local and regional scales. Relative to the conventional approach, the improved method recovered almost one order of magnitude more gold grains from samples (regional and down-ice mineralization), dominantly in small size fractions. Increasing the counts in low-abundance regional samples enables better discrimination between background signals and significant dispersions. The method offers an alternative to improve characterization of gold dispersal in glaciated terrain and the related gold deposit footprints.

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Section: Study Areamentioning

confidence: 99%

Section: Benefit Of Improving the Countsmentioning

confidence: 99%

Automated Gold Grain Counting. Part 1: Why Counts Matter!

Girard¹,

Trembaly²,

Néron³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…3) montre que la partie centrale de la ceinture de Swayze est dominée par de grands plissements synclinaux et anticlinaux F 2 associés à une foliation de plan axial S 2 (Heather et al, 1995a). Les grands plis régionaux comme le synforme de Brett Lake et l'antiforme de Woman River (Fig.…”

Section: Géologie Structuraleunclassified

“…Les grands plis régionaux synformes sont affectés par des zones de déformation intense orientées sud-est caractérisées par un aplatissement et une composante de mouvement dextre (Heather et al, 1995a). Ces zones de déformation majeure sont semblables aux zones de déformation documentées ailleurs à travers la ceinture de roches vertes de l'Abitibi (Heather et al, 1995a leur relation avec la géologie locale ; 5) leur relation avec la structure et 6) leur relation avec la minéralisation.…”

Section: Géologie Structuraleunclassified

“…Ces zones de déformation majeure sont semblables aux zones de déformation documentées ailleurs à travers la ceinture de roches vertes de l'Abitibi (Heather et al, 1995a leur relation avec la géologie locale ; 5) leur relation avec la structure et 6) leur relation avec la minéralisation. Un sommaire des ces connaissances est présenté à l'annexe 1.…”

Section: Géologie Structuraleunclassified

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