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TitleRegional and local-scale gold grain and till geochemical signatures of lode Au deposits in the western Abitibi Greenstone Belt, central Canada
AuthorMcClenaghan, M BORCID logo
SourceDrift exploration in glaciated terrain/Drift exploration in glaciated terrain; by McClenaghan, M BORCID logo (ed.); Bobrowsky, P TORCID logo (ed.); Hall, G E M (ed.); Cook, S J (ed.); Geological Society, Special Publication 185, 2001 p. 201-224,
Alt SeriesGeological Survey of Canada, Contribution Series 1999185
PublisherGeological Society of London
Mediapaper; on-line; digital
File formatpdf
ProvinceOntario; Quebec
NTS31L/10; 31L/11; 31L/14; 31L/15; 31M; 31N/11; 31N/12; 31N/13; 31N/14; 32C/03; 32C/04; 32C/05; 32C/06; 32C/11; 32C/12; 32C/13; 32C/14; 32D; 32E; 32F; 41P/09; 41P/10; 41P/11; 41P/12; 41P/13; 41P/14; 41P/15; 41P/16; 42A; 42H
AreaTimmins; Matheson; Kirkland Lake; Rouyn-Noranda; La Sarre; Val-d'Or; Matagami; Lake Abitibi; Otisse Lake; Peterlong Lake; Radisson Lake
Lat/Long WENS -82.0000 -76.0000 50.0000 46.5000
Subjectsgeochemistry; surficial geology/geomorphology; economic geology; gold geochemistry; drift prospecting; till geochemistry; glacial deposits; gold, native; sampling methods; grain size analysis; dispersal patterns; Archean; metavolcanic rocks; metasedimentary rocks; intrusive rocks; fracture filling deposits; inclusions; tills; glaciolacustrine deposits; till stratigraphy; peatlands; till samples; geochemical surveys; Wisconsinian glacial stage; exploration methods; mineral exploration; drilling; geochemical analyses; till stratigraphy; quartz veins; sulphides; sediment transport; source rocks; anomalies; tholeiites; mafic rocks; pebble counts; sands; gravels; clays; silts; glaciofluvial deposits; pyrite; volcanic rocks; diabases; mafic metavolcanic rocks; ultramafic metavolcanics; Abitibi Greenstone Belt; Destor-Porcupine fault zone; Larder Lake-Cadillac fault zone; Matheson Till; Owl Creek beds; Owl Creek gold deposit; Golden Pond gold deposit; Pamour deposit; Matachewan golddeposit; Hislop deposit; Laurentide Ice Sheet; Lake Ojibway; Gowganda Formation; Young-Davidson gold deposit; dispersal trains; Quaternary; Precambrian
Illustrationssketch maps; block diagrams; flow charts; secondary electron images; histograms; graphs; tables; profiles; photographs
Released2001 01 01
AbstractThis 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 Greenstone Belt of central Canada. It summarizes a large volume of data produced by government regional surveys and case studies as well as that from industry-led gold exploration programs. Regional till surveys can be used as targeting mechanisms for further Au exploration. Anomalies are defined by a series of samples with elevated Au concentrations that lie along significant bedrock structures, occurring in clusters or as isolated samples in areas of low sample density. Thresholds between background and anomalous Au grain abundances or Au concentrations are variable and depend on location within the Abitibi Greenstone Belt. Case studies around known deposits provide examples of geochemical and mineralogical signatures of Au deposits that can be expected in till down-ice. These serve as sources of information on appropriate sampling methods and size fractions to analyse, and on ice flow patterns, local glacial stratigraphy and suitable till units for sampling. Two methods for measuring the Au content of till are commonly used: (1) a count of visible Au grains and (2) geochemical elemental analysis. Close to source, till contains thousands to hundreds of thousands ppb Au and several hundred Au grains. The Au grains vary from coarse sand to silt sizes and have pristine shapes. The presence of high Au concentrations in till indicates that the ore zones subcrop and that glacial processes have produced Au dispersal trains down-ice.

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