|Title||Granite-Related Mineralization and Alteration in the Acadian Plutonic Belt: Implications for Sn-W-Mo-Cu Exploration in Central New Brunswick|
|Author||McClenaghan, S; Thorne, K; Rogers, N|
|Source||Geological Association of Canada-Mineralogical Association of Canada, Excursion Guide (2014), pt. B1, 2014. Open Access|
|Links||Online - En ligne|
|Alt Series||Earth Sciences Sector, Contribution Series 20120484|
|Publisher||Geological Association of Canada|
|Publisher||Mineralogical Association of Canada|
|Meeting||GAC-MAC Joint Annual Meeting; Fredericton; CA; May 21-23, 2014|
|Related||This publication is related to Granite-related
mineralization and alteration in the Acadian Plutonic Belt: implications for Sn-W-Mo-Cu exploration in central New Brunswick -- TGI 4 Field Guide|
|Subjects||metallic minerals; general geology; magmatism; migmatites; plutons; granites; diorites; tungsten; molybdenum; selenium; gold; antimony; mineralization; mineral potential; Acadian Plutonic Belt; Trousers
Lake Complex; Burnt Hill Mine site; Tin Hill; Todd Mountain; Sisson Brook deposit; Devonian|
|Abstract||Devonian magmatism associated with crustal thickening during the Acadian Orogeny (circa 390-420 Ma) has produced voluminous granite-granodiorite plutons, which intrude high-grade migmatites and variably
altered (greenschist-amphibolite) volcanic and|
sedimentary rocks in the central Miramichi highlands. The Acadian Plutonic Belt is host to a variety of endo- and exogranitic mineralized zones prospective for Sn, W, Mo, Cu, Sb, Au, and rare earth
elements. Devonian plutonism is considered to be the most likely source of the widespread Sn-W-Mo-Cu mineralization in the Acadian Plutonic Belt, with timing and mode of emplacement of these plutons significantly constraining mineralization.
High-grade migmatites of the Trousers Lake Complex at the western end of the Acadian Plutonic Belt are typically barren of any Sn-W-Mo-Cu mineralization, whereas metasedimentary lithotypes of the Miramichi Group to the east, host numerous
occurrences. The three-day excursion will focus on the style of mineralization at both past-producing and future mines as well as several prominent occurrences with resource potential.
The Sisson Brook Sn-W-Mo-Cu deposit represents one of Canada's
largest tungsten resources (334 Mt; 0.066% WO3 and 0.021% Mo), expected to supply 5% of the world's tungsten once operations commence in 2015. The field trip will visit several trenches and spoils at the Sisson deposit, where participants can examine
outcrops of vein mineralization (scheelite, wolframite, molybdenite, chalcopyrite) as well as contacts between associated intrusive suites and host metasedimentary rocks. Similar mineralization will be examined at the Tin Hill and Todd Mountain
occurrences, which offer vast exposures of Sn-W-Mo-Cu mineralization and greisen alteration in both intrusive and metasedimentary host rocks. The field trip will conclude with a visit to the Burnt Hill Mine site, mined intermittently during the early
1900's, and the focus of recent exploration efforts. Many of the old mine adits and spoils are still accessible on site, as are well-exposed ore-bearing veins and contacts with the host sedimentary sequence.
The Burnt Hill site is known for
quality specimens of wolframite, topaz and cassiterite as well as bulk samples of ore breccias and mineralized quartz veins.