Baja Mining has broken ground at its 70% Boleo copper-cobalt-zinc project in Baja California Sur, Mexico.
The company has invested $1.2bn in the construction project, in which a Korean Consortium is a minority partner.
The Boleo project has met its environmental compliance and surface mining activities continue in targeted areas.
Major ore grinding equipment is scheduled to arrive on site next month.
The start of copper production remains on target to take place in the first quarter of 2013.