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TitleStructural geology of a gold-bearing quartz vein system, Wilding Lake region, central Newfoundland
AuthorHonsberger, I WORCID logo; Bleeker, WORCID logo; Sandeman, H A I; Evans, D T W
SourceNewfoundland and Labrador, Department of Natural Resources, Geological Survey, Report, Current Research vol. 19, issue 1, 2019 p. 23-38
Alt SeriesNatural Resources Canada, Contribution Series 20220598
Mediapaper; digital; on-line
File formatpdf
ProvinceNewfoundland and Labrador
NTS1K; 1L; 1M; 1N; 2C; 2D; 2E; 2F; 2K; 2L; 2M; 2N; 11I; 11J; 11O; 11P; 12A; 12B; 12G; 12H; 12I; 12J; 12O; 12P
AreaWilding Lake
Lat/Long WENS -59.9672 -52.1775 51.9233 46.2650
Subjectsgeneral geology; Science and Technology; mineralogy; metallic minerals; quartz; gold; Structural geology
Illustrationslocation maps; diagrams; photographs
ProgramTargeted Geoscience Initiative (TGI-5) Gold ore systems - tectonic drivers and conduits
Released2019 03 01
AbstractThe structurally controlled gold belt of central Newfoundland is emerging as a significant exploration jurisdiction in Canada. The gold district occurs within a northeast-trending structural corridor defined by crustal-scale faults extending from southwestern to north-central Newfoundland. Silurian syn-orogenic polymict conglomerate (Rogerson Lake Conglomerate) characterizes the structural corridor. The presence of conglomerate reflects preservation of syn-orogenic upper crustal clastic sequences commonly associated with orogenic gold vein systems. The largest known gold resource along this corridor occurs at Marathon Gold Corporation's Valentine Lake property. Marathon's most recent public news release on Valentine Lake reports a measured and indicated gold resource of 2.69 Moz grading at 1.85 g/t and an inferred resource of 1.53 Moz grading at 1.77 g/t. Recent exploration by Antler Gold Inc. on previously unexplored property in the Wilding Lake area, adjacent to the northeast corner of the Valentine Lake property, exposed a system of gold-bearing quartz veins hosted by syn-orogenic sedimentary rocks, felsic volcanic rocks and volcaniclastic rocks. Detailed structural study of these gold-bearing zones on the Antler Gold Inc. property demonstrates that the main ~2-mwide gold-bearing quartz vein, which extends for ~230 m along strike, cuts the conglomerate host and occurs within an oblique sinistral reverse shear zone that involved a component of north-northeast-directed thrusting. An early set of stacked, moderately dipping extensional quartz veins, consistent with sinistral reverse shear, emanate outward into the country rock from the main vein. Younger, more steeply dipping sets of extensional quartz veins cut the main vein and the earlier shallowdipping vein set, and are consistent with at least transient phases of horizontal extension and dextral transpression. Chalcopyrite and secondary malachite occur locally in the early vein sets, but are more abundant overall within the later, steeper, extensional vein sets. A nearly conjugate set of steeply dipping extension fractures cut the main vein and the extensional vein sets. These fractures are typically filled with an assemblage of vuggy quartz-chalcopyrite-malachite ± tourmaline ± pyrite ± hematite ± goethite ± bismuth-tellurium sulphide(s). Regional correlations suggest that the quartz vein system experienced a progressive structural history during the Late Silurian and Early Devonian.
Summary(Plain Language Summary, not published)
This contribution describes the setting and geometries of gold-bearing quartz veins in central Newfoundland.

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