|Résumé||(disponible en anglais seulement)|
The eight papers presented in this issue of Exploration & Mining Geology arose primarily from presentations made in a Special Session at the GeoCanada 2010
conference, held in Calgary during May 2010. Uranium ore system research in Canada at the time was gaining momentum, based on favourable market conditions, strong ongoing industry and NSERC-industry research support, and completion of successive
government-led collaborative programs (e.g. EXTECH IV and Canadian Secure Energy Program). Since this conference, uranium ore systems research has remained very active in Canada, including ongoing industry and NSERC-industry research, as well as
renewed collaborative multidisciplinary projects supported by the Geo-Mapping for Energy and Minerals (GEM) and Targeted Geoscience Initiative Four (TGI-4) programs delivered by the Geological Survey of Canada for Natural Resources Canada.
GeoCanada 2010, the two-day uranium special session ¿Geological Environments hosting Uranium Deposits¿ received 33 submissions, consisting of 21 oral presentations and 12 posters. While the papers in this issue cover a spectrum of uranium ore
districts in Canada, from the Central Mineral Belt, through the Athabasca and Thelon Basins, to the Great Bear magmatic zone, they fall into two broad categories: advanced ore deposit studies and developments in uranium exploration methods.
Advanced ore deposit studies are addressed by Bridge et al., McKechnie et al., and Wheatley and Cutts. Bridge et al. report the first modern study on the historic Lac Cinquante deposit. Benefitting from updated regional geological maps and
incorporating new geological interpretation and geochronology, the authors propose a new genetic model for this revived camp. McKechnie et al. detail the petrogenesis of intrusion-related uranium mineralization in the Fraser Lakes area, immediately
southeast of the Athabasca Basin, and draw analogies with global examples. Finally, Wheatley and Cutts present an update on the Maybelle River deposit, the most prospective occurrence located in the Alberta portion of the Athabasca Basin. As noted
by the authors, this system correlates well with known mineralization in the Eastern Athabasca and highlights the exploration potential in the western Athabasca Basin.
Developments in uranium exploration technology and geoscience models are
presented by Pan et al., Percival et al., Sparkes, Ootes et al., and Tschirhart et al. Pan et al. outline exploration advances using radiation-induced defects (RIDs) with respect to unconformity-associated deposits. Advances in this technique, as
outlined in the paper, now permit inferences on the uranium fertility of hydrothermal alteration systems using electron paramagnetic resonance studies of quartz. Percival et al. describe an unusual hydraulic breccia in the Athabasca Basin and
present implications for basin diagenesis, fluid migration, and uranium mineralization. Sparkes re-evaluates a novel method to develop high-resolution images of the distribution of radioactive minerals in geological samples, using examples of
uranium mineralization from the Central Mineral Belt, Labrador. Ootes et al. highlight applications of new bedrock mapping and radiometric surveys in exploration for uranium-deposits in the Great Bear magmatic zone, a historically significant
uranium district with revitalized exploration potential with the discovery of the entire spectrum of iron oxide-copper-gold deposits (polymetallic hematite-group ± U, magnetite-group) and affiliated systems (iron-oxide alkali altered, Na-metasomatic
U, etc). Finally, Tschirhart et al. present a new utility to delineate faults using edge-detection in aeromagnetic data, providing a potential capability to discriminate between ancient basement structures and more prospective reactivated faults
which cross-cut overlying sandstones in unconformity-associated environments.
We are grateful to the authors for their participation in the highly successful GeoCanada 2010 conference and for their patience while this Exploration & Mining
Geology special issue was brought to press. Support of the special issue by Geomapping for Energy and Minerals (GEM) and Targeted Geoscience Initiative (TGI-4) permitted printing of all manuscripts in colour. We gratefully acknowledge the support
editorial leadership of past-editor Jeremy Richards and current editor Steve McCutcheon.
|Résumé||(Résumé en langage clair et simple, non publié)|
Les huit articles présentés dans ce numéro d'Exploration & Mining Geology sont principalement tirés de présentations faites lors d'une session
spéciale du congrès GeoCanada 2010, tenu à Calgary en mai 2010. À l'époque, la recherche sur les systèmes minéralisateurs de l'uranium prenait de l'ampleur en raison d'un marché favorable, du soutien fort et continu de l'industrie et des
collaborations industrie-CRSNG à la recherche industrielle (p.ex., EXTECH IV et le Programme de sécurité de l'approvisionnement énergétique du Canada). Depuis le congrès, la recherche sur les systèmes minéralisateurs de l'uranium est restée très
active au Canada, en raison notamment des recherches continues de l'industrie et en collaboration avec le CRSNG et du renouvellement de projets collaboratifs multidisciplinaires, soutenus par les programmes Géocartographie de l'énergie et des
minéraux et Initiative géoscientifique ciblée (phase 4), deux programmes réalisés par la Commission géologique du Canada pour Ressources naturelles Canada.