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TitleGeology of the Éléonore gold mine and adjacent gold showings, Superior Province, northern Quebec
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorFontaine, A; Dubé, B; Malo, M; McNicoll, V J; Prud'homme, N; Beausoleil, C; Goutier, J
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 121-125, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
File formatpdf
NTS33B/05; 33B/12; 33C/08; 33C/09
AreaEeyou Istchee Baie-James
Lat/Long WENS -76.2667 -75.7667 52.7500 52.5667
Subjectseconomic geology; tectonics; structural geology; mineral deposits; mineral exploration; mineral potential; gold; copper; silver; molybdenum; ore mineral genesis; ore controls; structural controls; mineralization; mineral assemblages; tin; bismuth; tungsten; tectonic setting; metamorphism; deformation; foliation; crenulations; cleavage; lineaments; alteration; albitization; silicification; arsenopyrite; pyrrhotite; loellingite; quartz; feldspar; pyrite; hydrothermal systems; replacement deposits; intrusions; veins; quartz veins; veinlets; stockworks; dykes; bedrock geology; structural features; faults; folds; bedding planes; lithology; metasedimentary rocks; turbidite sedimentation; breccias; igneous rocks; intrusive rocks; tonalites; granodiorites; pegmatites; diabases; diorites; volcanic rocks; pillow lavas; tuffs; sedimentary rocks; conglomerates; pelites; metamorphic rocks; paragneisses; amphibolites; schists; strain analysis; Archean; Superior Province; La Grande Subprovince; Éléonore Mine; Opatica Subprovince; Éléonore Property; Éléonore South Property; Cheechoo Property; Cheechoo Prospect; Moni Prospect; Low Formation; Ell Lake showing; Precambrian
Illustrationslocation maps; geoscientific sketch maps; photographs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Gold systems
Released2018 01 19
AbstractLocated in the northeastern part of the Superior Province, the Éléonore mine had mineral reserves of 4.57 Moz (23.44 Mt at 6.07 g/t Au), measured and indicated gold mineral resources of 0.93 Moz (5.14 Mt at 5.66 g/t Au) and inferred mineral resources of 2.35 Moz (9.73 Mt at 7.52 g/t Au). Predominantly hosted by metamorphosed and deformed turbiditic rocks of the La Grande subprovince, the deposit is located 1.5 km south of the tectonometamorphic boundary with the Opinaca subprovince. Subparallel ore zones composed an envelope with a width of 70 to 80 m and vertical extension of >1.4 km. Associated with potassic, boron- and calcium-rich alteration assemblages and Au-As-Sb-Bi -W metallic signature, gold mineralization is associated with disseminations of arsenopyrite, pyrrhotite and löllingite. Various mineralization styles include veins and hydrothermal breccia, replacement zones, stockwork of quartz veins and veinlets composed of quartz, dravite, microcline, phlogopite, actinolite, diopside, hedenbergite, muscovite and schorl. Recent activities include field and underground mapping on the Éléonore, Éléonore South and Cheechoo properties. Gold mineralization also occurs within the Cheechoo tonalite/granodiorite, pegmatites and paragneiss (Cheechoo and Moni prospects). At Cheechoo and Moni, gold mineralization is structurally-controlled and associated with the presence of quartz-feldspar-(biotite-arsenopyrite-scheelite) sheeted veinlets in association with silicification albitization and 1 to 2% of arsenopyrite, pyrrhotite, pyrite and visible gold. This emerging gold district shares analogies with hypozonal orogenic gold deposits and reduced intrusion-related gold systems and illustrates the potential of an area affected by a high metamorphic gradient near a subprovince boundary.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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