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TitlePreliminary geological and mineralogical notes on the Nugget Pond gold deposit, Baie Verte Peninsula, Newfoundland
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AuthorSwinden, S; McBride, D; Dube, B
SourceCurrent research; by Pereira, C P G (ed.); Walsh, D G (ed.); Blackwood, R F (ed.); Newfoundland and Labrador Mineral Development Division, Report 90-01, 1990 p. 201-215
Alt SeriesGeological Survey of Canada, Contribution Series 38990
Alt SeriesNewfoundland and Labrador Mineral Development Division, Current Activities
MapsPublication contains 1 map
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (1996). Current Research, Geological Survey of Canada, Current Research no. 1996-E
ProvinceNewfoundland and Labrador
AreaBetts Cove; Snooks Arm; Baie Verte Peninsula; Nugget Pond
Lat/Long WENS-56.0000 -55.5000 50.0000 49.7500
Subjectsmetallic minerals; economic geology; sedimentology; geochronology; igneous and metamorphic petrology; regional geology; stratigraphy; gold; mineralization; mineral deposits; mineralogical analyses; reserves; ore grades; strata-bound deposits; drillholes; pyrite; sulphides; argillites; sedimentary rocks; metallogeny; deformation; metamorphism; galena; pyrrhotite; chalcopyrite; electrum; stilpnomelane; volcanic rocks; dykes; basalts; pillow lavas; ultramafic rocks; ophiolites; igneous rocks; zircon dates; uranium lead dates; radiometric dates; turbidites; siltstones; greywackes; sandstones; mineral assemblages; paragenesis; bedrock geology; Nugget Pond Gold Showing; Snooks Arm Group; Betts Cove Ophiolites; Betts Cove Complex; Bobby Cove Formation; Betts Cove Mine; Tilt Cove Mine; Ordovician
Illustrationssketch maps; cross-sections; photographs; charts; photomicrographs
AbstractThe Nugget Pond gold deposit, discovered by Bitech Energy Resources Limited in 1988, is one of Newfoundland's most significant new gold discoveries. To the end of 1989, 106 diamond-drill holes have outlined drill-indicated reserves of 514,000 tonnes, grading 14.1 g/t gold. The deposit is hosted by volcaniclastic and hydrothermal sediments within the pillow lavas of the Betts Cove (ophiolite) Complex. Mineralization is stratabound, and is concentrated in a dark-green to black pyritic argillite horizon. Highest gold grades are associated with very coarse euhedral pyrite. There is little evidence of shearing, widespread hydrothermal alteration or metasomatism. Microscopic studies reveal a complex history of mineralization and veining, reflecting both syngenesis and processes related to weak regional deformation. Syngenetic and later epigenetic pyrite is the major sulphide phase, with accessory chalcopyrite, galena and pyrrhotite. Gold occurs as electrum and is commonly late in the paragenetic sequence. Stilpnomelane is widespread in iron-rich horizons and veins proximal to ore. Although gold observed, to date, is generally late in the paragenetic sequence, it has probably been remobilized, and the present evidence does not constrain the timing of its original introduction into the environment. Both syngenetic and epigenetic models of mineralization can be entertained. Further detailed studies of the ore are needed to fully document the mineralization and interpret its genesis.