Regional and local-scale gold grain and till geochemical signatures of lode Au deposits in the western Abitibi Greenstone Belt, central Canada

McClenaghan, M B

doi:10.1144/gsl.sp.2001.185.01.09

Cited by 17 publications

(5 citation statements)

References 26 publications

(39 reference statements)

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“…The Cochrane surge (flow VI) is recorded by the youngest striations, oriented toward the south, southeast, and east-southeast, extending from the James Bay region to the area where glacial Lake Ojibway formed. The Matheson till, deposited during the Wisconsinan glaciation, is overlained by thick (5 to 30 m) glaciolacustrine silt and clay deposits that accumulated in glacial Lake Ojibway, Cochrane till, and extensive peatland (Veillette 1995;McClenaghan 2001). The till sampling area of this study, east of Val-d'Or, was only affected by ice flow V oriented toward the south and southwest (Fig.…”

Section: Quaternary Geologymentioning

confidence: 79%

“…During the last 2 m.y., several glaciations such as the Nebraskan, Kansan, Illinoian, and Wisconsinan have shaped the surface of the Abitibi Subprovince. The most distinct glacial footprint on the current landscape resulted from the complex sequence of ice flows that formed during the Wisconsinan glaciation (Veillette and McClenaghan 1996;McClenaghan 2001). However, signs of previous glaciations are also recorded on the surface of bedrock.…”

Section: Quaternary Geologymentioning

confidence: 99%

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Tourmaline, scheelite, and magnetite compositions from orogenic gold deposits and glacial sediments of the Val-d'Or district (Québec, Canada): Applications to mineral exploration

Grzela

Beaudoin

Bédard

2019

Journal of Geochemical Exploration

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Section: Quaternary Geologymentioning

confidence: 79%

Section: Quaternary Geologymentioning

confidence: 99%

Tourmaline, scheelite, and magnetite compositions from orogenic gold deposits and glacial sediments of the Val-d'Or district (Québec, Canada): Applications to mineral exploration

Grzela

Beaudoin

Bédard

2019

Journal of Geochemical Exploration

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show abstract

“…Accordingly, till has been sampled for decades in gold exploration programs and regional surveys, and numerous studies e.g. [2,7,[60][61][62][63] have highlighted that, like in ore deposits, most gold in till is fine-grained, with a maximum rate of occurrence around 30-50 µm while using the conventional method. However, most data collected for exploration purpose do not includes accurate size measurement, limited to size brackets estimation only.…”

Section: µMmentioning

confidence: 99%

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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“…Glacial till, which essentially consists of sub-glacial grinded sediments that are not affected by hydraulic transport, is not significantly affected by the elutriation process, regardless of the transport distance [18]. Accordingly, till has been sampled for decades in gold exploration programs and regional surveys, and numerous studies [2,7,[64][65][66][67][68] have highlighted that, like in ore deposits, most gold in till is fine-grained, with a maximum rate of occurrence of around 30-50 µm using the conventional method. However, most data collected for exploration purposes do not include an accurate size measurement, as they are limited to size bracket estimation.…”

Section: Gold Grain Size Distribution In Source Rocksmentioning

confidence: 99%

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

Girard¹,

Tremblay²,

Néron³

et al. 2021

Minerals

View full text Add to dashboard Cite

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, which is widely used in the industry and has resulted in 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 difficulties associated with visually identifying the predominantly small gold grains. These limitations hinder its capacity to decipher subtle or complex signals. To improve detection limits through the recovery of small gold grains, a new approach has recently been introduced into the industry, which is commercially referred to as the “ARTGold” procedure. This procedure involves the use of an optimized miniature sluice box coupled with an automated scanning electron microscopy routine. The capabilities of this improved method were highlighted in this study 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 that with the conventional approach, the improved method increased the recovery of gold grains from samples (regional and down-ice mineralization) by almost one order of magnitude. (regional and down-ice mineralization), dominantly in regard of the small size fractions. Increasing the counts in low-abundance regional samples allows for a better discrimination between background signals and significant dispersions. The described method offers an alternative for improving the characterization of gold dispersal in glaciated terrain and related gold deposit footprints.

show abstract

Regional and local-scale gold grain and till geochemical signatures of lode Au deposits in the western Abitibi Greenstone Belt, central Canada

Abstract: This paper is an overview of drift exploration methods for lode Au deposits in areas of thin and thick cover of glacial sediments within the Abitibi

Cited by 17 publications

References 26 publications

Tourmaline, scheelite, and magnetite compositions from orogenic gold deposits and glacial sediments of the Val-d'Or district (Québec, Canada): Applications to mineral exploration

Tourmaline, scheelite, and magnetite compositions from orogenic gold deposits and glacial sediments of the Val-d'Or district (Québec, Canada): Applications to mineral exploration

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

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

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