Extending the Life of Brunswick Mine - An Integrated Approach to the Evaluation of the Mining Remnants: Many Opportunities, Many Challenges.

Mining Rocks! CIM Toronto 2005
Éric Coté,
Abstract Brunswick Mine, part of the Zinc business unit of Noranda Inc., is one of the largest zinc-lead mines in the world. In continuous operation since 1964, the underground mine has produced over 110 million tonnes of ore grading 8.85 %Zn, 3.48 %Pb, 0.36 %Cu, 102 g/t Ag, and 0.6 g/t Au. Mining production averaged 9,650 tonnes per day over the last five years. Brunswick is a complexly deformed and metamorphosed volcanogenic massive sulphide deposit of Ordovician age. It is hosted in a group of steeply dipping sedimentary and volcanic rocks along a laterally extensive exhalative iron formation. The deposit is multi-lens and consisted, before mining, of approximately 330 million tonnes of massive sulphides (165 million tonnes at economic grade).
This paper will review the mine geology, some historical data, the geological model and the methodology used to estimate the Mineral Reserves and the Mineral Resources, emphasizing the integrated work between geologists, mine engineers, production staff as well as metallurgists. An evaluation of the additional Mineral Resources and other mining remnants, which offer potential to extend the mine life beyond the end of 2009, is ongoing. An overview of this evaluation process will be presented.
Keywords: Mineral reserves, Brunswick, Massive sulphides, Bathurst, mine life, Mineral resources
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