DATE: Thursday 11th February 1993 at 5.15pm
VENUE: Rugby Club - 1st Floor
SPEAKERS: Bob Valliant - General Manager, Tri Origin Exploration Ltd
TOPIC: "Hemlo-style gold mineralization in the Canadian Shield"
Gold deposits such as at Hemlo, Ontario and Bousquet, Quebec now account for a
significant proportion of Canadian Shield gold production. These deposits are
stratiform and characterised by a variable pyrite content, associated metals including
Cu, Zn, Ba, Mo, Sb, Hg, As and Mn and stratabound sericite and aluminous alteration
assemblages. This style of mineralization occurs near the stratigraphic top of
fine-grained, quartz crystal-rich felsic volcanic rocks which are distal from major volcanic centres
and adjacent to thick accumulations of sedimentary rock. The lithofacies boundaries are
generally associated with major structural breaks which do not appear to play a deposit-scale role in formation
or localization of ore.
This characteristic geological environment remains relatively unexplored for stratiform, pyritic
gold deposits which remain attractive targets even during periods of low gold price.
The Hemlo Gold Deposit, Northern Ontario, Canada: Background Information - Venetia Bodycomb
Previous meeting