Open Pit Mining of Golden Band Resources' EP Gold Deposit, Waddy Lake, Saskatchewan

CIM MEMO 2011
Charlie Harper, Klaus Lehnert-Thiel, Mary Anderson, Melissa Nizinkovich, Ken Donner, Jennifer Nicolay,
Abstract The EP gold deposit has unique characteristics which will require meticulous and detailed mine planning to capture its distinctive types of mineralization. Three and possibly four types of mineralization exist: 1) steeply-dipping, primary auriferous structurally-controlled quartz veins with pyritic wall rocks associated with a shallow-dipping diorite sill; 2) a gold and copper-enriched supergene zone that follows and parallels the sill; 3) a gold-enriched till dispersion fan; and 4) possible placer gold concentrations in early stream-deposited sands and gravels that eroded the supergene ore. Much of EP is covered by up to 10 m of glacio-lacustrine clays and/or a thin till veneer. Supergene ore subcrops in the northern end of the deposit and locally has bonanza ore grades. This ore is soft and rubbly, and could easily be mistaken for till; therefore, close monitoring will be needed when removing the lacustrine clays and any till present, so the potentially high-grade ore will not be lost. Sand and gravel deposits which immediately overlie bedrock will also need special handling and be checked for placer gold concentrations. Both the supergene and placer types will be distinctive from the clay deposits. The deeper primary ore will be amenable to conventional open pit methods.
Keywords: placer, Mine planning, Gold, supergene ore, lacustrine clays, EP deposit, Mine
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