Deposit number | Country | Location | Names | Commodities |
800 | Canada (New Brunswick) | 47.41.00 N -- 065.53.48 W | Millstream; Millstream Cu-Fe skarn; Ellis Iron Mine | Fe; Cu |
Database name: | World Fe-oxide+/-Cu-Au-U (IOCG) deposits | ||||||||||||||||||||||||||||||||||||||||||||||||||
Compilers: | Sunil S. Gandhi | ||||||||||||||||||||||||||||||||||||||||||||||||||
Release date: | 2015-03-04 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Deposit name(s): | Millstream; Millstream Cu-Fe skarn; Ellis Iron Mine | ||||||||||||||||||||||||||||||||||||||||||||||||||
Political location(s): | Canada; Province or state: New Brunswick; Nearest community: Bathurst (20 km 290°) | ||||||||||||||||||||||||||||||||||||||||||||||||||
NTS map data: | 021P12 (Bathurst) | ||||||||||||||||||||||||||||||||||||||||||||||||||
Deposit clan (type): | Iron Skarn-type | ||||||||||||||||||||||||||||||||||||||||||||||||||
Deposit (sub) types: | massive magnetite bodies, up to 12 m wide, occur in stratabound skarn lenses over strike length of 300 m; magnetite replaces the skarn minerals; locally garnet-magnetite bands; minor breccia-fillings; Reference: Lentz, D. R.; Walker, J. A.; Stirling, J. A. R., 1995: Millstream Cu-Fe Skarn Deposit: An Example of a Cu-bearing Magnetite-rich Skarn System in Northern New Brunswick; Exploration and Mining Geology, Volume 4, p. 15 - 31 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Deposit status: | prospect; Size category: 0.3 Mt | ||||||||||||||||||||||||||||||||||||||||||||||||||
Geologic province: | Appalachian | ||||||||||||||||||||||||||||||||||||||||||||||||||
Geologic subprovince: | Tobique-Chaleur Belt | ||||||||||||||||||||||||||||||||||||||||||||||||||
Geologic district: | Nigadoo River Synclinorium | ||||||||||||||||||||||||||||||||||||||||||||||||||
Deposit object located: | centre-deposit on surface | ||||||||||||||||||||||||||||||||||||||||||||||||||
Commodities: | Fe; Cu | ||||||||||||||||||||||||||||||||||||||||||||||||||
Mineralization styles: | stratiform magnetite layers and lenses; streaks; veins; breccia-fillings | ||||||||||||||||||||||||||||||||||||||||||||||||||
Geological ages: | Early Silurian - Late Silurian (host rocks) Middle Devonian (related magmatics) Middle Devonian (mineralization) | ||||||||||||||||||||||||||||||||||||||||||||||||||
Tectonic setting: | epicontinental deformation zone-fold belt; transpressive; Formal name: Nigadoo River synclinorium of Acadian orogen (host rocks) | ||||||||||||||||||||||||||||||||||||||||||||||||||
Coincident features: | intrusive contact (mineralization in contact metamorphic aureole on southeast side of the pluton); Coincident feature name: Nicolas Dénys pluton fault zone (east-northeast trending fault zone parallels second generation folds in host strata); Coincident feature name: Rocky Brook- Millstream Faut Zone host lithology (reactive limestone unit altered to skarn, which in turn was replaced by magnetite); Coincident feature name: La Vielle Formation | ||||||||||||||||||||||||||||||||||||||||||||||||||
Regional tectonic structure: | major fold (west-trending, doubly plunging synclinorium formed during the Acadian orogeny) Tectonic structure name: Nigadoo River synclinorium second order folds (south limb of the Nigadoo River synclinorium folded into doubly plynging anticline-syncline pair) Tectonic structure name: east-northeast trending folds major fault zone (100 m wide fault zone, dips steeply to the south; trends parallel to subvertical axial plane of the second-order anticline) Tectonic structure name: Rocky Brook-Millstream Fault Zone | ||||||||||||||||||||||||||||||||||||||||||||||||||
Host rocks: | (1) sedimentary; carbonate (Early Silurian Chaleurs Group; overlies basal conglomerate of the group); Depositional setting: carbonate platform; Metamorphic grade: greenschist
(2) sedimentary; sandstone-conglomerate (basal unit of Early Silurian Chaleurs Group); Depositional setting: carbonate platform; Metamorphic grade: greenschist
(3) volcanic; ultramafic volcanic rocks (Ordovician ophiolite and peridotite); Depositional setting: deep marine; Metamorphic grade: greenschist
(4) sedimentary; sandstone-conglomerate (overlies the La Vieille Formation); Depositional setting: carbonate platform; Metamorphic grade: greenschist
(5) sedimentary; mudstone-carbonate-sandstone-siltstone (upper part of the Chaleurs Group); Depositional setting: carbonate platform; Metamorphic grade: greenschist
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Related igneous rocks: | (1) intrusive; granodiorite-tonalite suite (Middle Devonian; nearly circular, 4.5 x 3.5 km pluton); Initials: Nicolas Dénys pluton; Magma series: calc-alkaline; Depositional setting: continental
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Metallogenic signatures: | Fe-Cu-Mo-W | ||||||||||||||||||||||||||||||||||||||||||||||||||
Alteration signatures: | skarn: grandite-diopside; What was altered: limestone-mudstone-siltstone epidotization: epidote; What was altered: mafic silicates albitization: albite, minor scapolite; What was altered: clay minerals chloritization: chlorite; What was altered: mafic silicates hematization: hematite; What was altered: magnetite | ||||||||||||||||||||||||||||||||||||||||||||||||||
Mineralogy: | (alteration): hematite (gangue): garnet (andradite), diopside, actinolite/tremolite, epidote, albite, chlorite, calcite, scapolite (mineralization): magnetite, sphalerite, pyrite, pyrrhotite, arsenopyrite, molybdenite, scheelite | ||||||||||||||||||||||||||||||||||||||||||||||||||
Radiometric ages: | Object dated: Related igneous rocks(1); Age - Ma: 381; +4; -4; Dating method: U-Pb; Concentrate: zircon; Source rock: granodiorite; Event dated: intrusive event; Interpretive comment: emplacement age of the pluton, which is regarded as the source of mineralizing hydrothermal fluids ; Reference: Walker, J.; Gower, S.; McCutcheon, S. R., 1991: Antinouri-Nicolas Project, Gloucester and Restigouche Counties, Northern New Brunswick (C-NBCAMD); in Project Summaries for 1991, Sixteenth Annual Review of Acivities, Edited by Abbott, S. A., Mineral Resources Circular, Review of Activities, New Brunswick Natural Resources and Energy, New Brunswick Department of Natural Resources and Energy, 912, p. 87 - 100 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Deposit shape: | tabular
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Qualified comments: | (Applies to: discovery and development) Discovered in 1890s; explored intermittently: edit driven in 1893; drilling 1949-1952; drilling in 1968 outlined a zone to 150 m depth with estimated 0.2 to 0.3 Mt averaging 1.2-1.5 % Cu, 22 g/t Ag. | ||||||||||||||||||||||||||||||||||||||||||||||||||
Links to other databases: | New Brunswick MINFILE; Key value: 425 | ||||||||||||||||||||||||||||||||||||||||||||||||||
References: |
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