St-Onge, who has a Queen's University MBA, spent the past nine years with Export Development Canada, most recently leading development of EDC's relationships with Canada's largest financial institutions.
"The future of mining is digital and Micromine's first class software solutions make it perfectly placed to embed itself as the new industry standard in North America," she said this week.
St-Onge is responsible for increasing revenue and driving market penetration in Canada of Australia-headquartered Micromine's exploration and mine design software, and data and fleet management products.
"We are seeing many positive signs in the market," she said.
"From our Canadian headquarters in the technology and mining hub of Vancouver, we will significantly grow our presence across Canada with a particular focus on growing our footprint in Quebec and Ontario."