|Title||Base metal and gold deposits of the Betts Cove Complex, Baie Verte Peninsula, Newfoundland|
|Author||Sangster, A L; Douma, S L; Lavigne, J|
|Source||Mineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods; by Goodfellow, W D (ed.); Geological Association of
Canada, Mineral Deposits Division, Special Publication no. 5, 2007 p. 703-721|
|Alt Series||Earth Sciences Sector, Contribution Series 20070211|
|Publisher||Geological Association of Canada, Mineral Deposits Division (St. John's, NL, Canada)|
|Related||This publication is contained in Goodfellow, W D; (2007).
Mineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods, Geological Association of Canada, Mineral Deposits Division, Special Publication no. 5|
|Province||Newfoundland and Labrador|
|Area||Baie Verte Peninsula; Betts Cove; Tilt Cove; Nugget Pond|
|Lat/Long WENS|| -56.0000 -55.5000 50.0000 49.7500|
|Subjects||economic geology; mineral deposits; mineral occurrences; mineralization; mineral potential; exploration; exploration methods; base metals; copper; zinc; gold; igneous rocks; ophiolites; tholeiites;
basalts; pillow breccias; hydrothermal alteration; alteration; mineral deposits genesis; ore mineral genesis; Betts Cove Complex; Tilt Cove Copper Deposits; Nugget Pond Gold Deposit; Scrape Point Formation; Mount Misery Formation|
|Illustrations||sketch maps; tables; photographs|
|Program||Consolidating Canada's Geoscience Knowledge|
|Program||Targeted Geoscience Initiative (TGI-3), 2005-2010|
|Abstract||The Betts Cove complex outcrops on the northeastern tip of the Baie Verte Peninsula, Newfoundland. It consists of a lower ophiolite sequence composed of a basal cumulate unit (now mostly talc-carbonate
schist), pillowed basalt, and pillow breccia, which are intruded by small gabbro bodies. The ophiolitic rocks are overlain by tholeiitic pillow basalt and pillow breccia, and are capped by red-green argillite. The upper part of the sequence consists
of mafic to intermediate volcanic and derived epiclastic rocks.|
The Tilt Cove copper deposits have been mined out. The east deposits appear to have consisted of massive to disseminated chalcopyrite with pyrite and pyrrhotite, which replaces
pillow breccia throughout the tholeiitic basalt immediately above its contact with boninitic volcanic rocks. The west deposit is more complex and may replace shear zones in chlorite-altered pillowed basalts. Contents of other base metals and gold are
low. The deposit is regarded as 'ophiolite-hosted'-type, even though it occurs stratigraphically above ophiolite sensu strictu.
Other smaller copper occurrences are primarily in shear zones that bring pillowed basalt and basalt breccia into
contact with transitional (upper) zone sheeted dyke rocks. These occurrences are dominantly pyrite with variable amounts of chalcopyrite (e.g. Mount Misery). The Nudulama occurrence contains isolated spectacular gold values, whereas the Betts Cove
occurrence contains high-grade gold values that vary directly with ore-grade zinc values.
The Nugget Pond gold deposit occurs in a red/green distal turbidite horizon stratigraphically above the tholeiitic pillowed basalt unit. The ore occurs
at three stratigraphic locations, 1) a magnetite-rich horizon at the base of the sedimentary section, 2) a magnetite-rich horizon near the top of the massive red sandstone, and 3) in a sulphide-, magnetite-rich chloritic unit in the base of a green
laminated siltstone. The gold mineralization is co-extensive with the intrusion of en echelon quartz-feldspar-carbonate veining. The ore formed by sulphidation of magnetite during a fluid flow event, probably during the Devonian.
occurrences in the complex are small but related to the same strata as the Nugget Pond horizon. Occurrences at Castle Rock and Long Pond east are both associated with talc-carbonate schist in the local sections.