O3 Mining Inc. engages in the acquisition, exploration, and development of precious metal resource properties in Canada. The company primarily explores for gold deposits. Its flagship property is the Marban Alliance property with 65 mining claims covering 2,189 hectares located in the western portion of the province of Québec, Canada. The company is headquartered in Toronto, Canada. Address: 155 University Avenue, Toronto, ON, Canada, M5H 3B7