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TitleGeophysical Signature of the NICO Au-Co-Bi-Cu Deposit and Its Iron Oxide-Alkali Alteration System, Northwest Territories, Canada
AuthorHayward, N; Corriveau, L; Enkin, R; Craven, J
SourceEconomic geology and the bulletin of the Society of Economic Geologists vol. 111, 8, 2016 p. 2087-2109,
Alt SeriesEarth Sciences Sector, Contribution Series 20150154
PublisherSociety of Economic Geologists
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories
NTS85M; 85N; 86C; O86D; 86E; 86F; 86K; 86L
AreaCanadian Shield
Lat/Long WENS-120.0000 -116.0000 67.0000 63.0000
Subjectseconomic geology; geochemistry; igneous and metamorphic petrology; metallic minerals; structural geology; geophysics; breccia deposits; mineral deposits; gold; cobalt; bismuth; copper; uranium; iron oxides; magnetite; magnetotelluric field; magnetotelluric interpretations; aeromagnetic surveys; aeromagnetic interpretation; metasedimentary rocks; mineralization; fracture filling deposits; metasomatism; alteration
Illustrationslocation maps; geological sketch maps; tables; magnetic anomaly maps; graphs
Released2016 11 16
AbstractModels of the three-dimensional physical property variation of the Au-Co-Bi-Cu NICO deposit, the Southern Breccia albitite-hosted uranium mineralization and their iron oxide and alkali alteration envelope were derived from the inversion of high-resolution aeromagnetic, gravity, and magnetotelluric data at deposit to regional scale. In turn, the integration of the geophysical results with physical property measurements and geological observations leads to a new understanding of the geometry of the deposit, adjacent mineralisation zones and potential cogenetic linkages within their host metasomatic system. NICO which is a magnetite-group iron oxide copper-gold (IOCG) deposit is associated with a discrete zone of lower electrical resistivity within a broader, NE-dipping zone of higher density. The high density zone overlaps a NE-dipping zone of higher magnetic susceptibility and is truncated to the southwest by a NW-striking, SW-dipping geophysical discontinuity interpreted as a major fault zone. This fault divides the magnetite-altered metasedimentary rocks hosting the NICO deposit from those which were sodically altered along the Southern Breccia corridor to the southwest. Active in the development of the metasomatic system, the fault influenced the formation of these distinct but complementary deposit types.
Summary(Plain Language Summary, not published)
The NICO deposit, located in the Great Bear magmatic zone, Northwest Territories, Canada, is a gold-cobalt-bismuth-copper deposit that was formed in a volcano dominated landscape about 1.8 billion years ago. Rocks of the deposit are iron-rich due to their transformation, by chemical reactions with hot metal-carrying fluids during deposit formation. The iron-rich rocks are relatively dense, magnetic, and electrically conductive affording the use of remote surveying methods for understanding the form and composition of the deposit. In this study we create three-dimensional models of the density, magnetism, and electrical conductivity of the NICO deposit. The 3D models are evaluated in conjunction with available geological maps and rock samples to better understand the connections between the remote survey results and geological observations on the ground. All of this information is used to construct a model of the formation and evolution of the NICO deposit.