Xstrata Copper has completed the expansion of Kidd Mine in Northern Ontario, Canada, at an estimated cost of C$120m (US$111m).
The company extended the mining zone at Mine D from 9,100ft to 9,600ft, which has an expected to mine life to the first half of 2018.
The expansion is in line with the company's 2020 vision programme launched in February 2011.
The programme helped identify 700,000t of ore reserves with the objective of extending operations further to 2020.
The latest Mine D expansion was the second stage of a project that has extended mining from 8,800ft since 2007 for total investment of C$148m (US$143.4m).
Kidd Operations general manager Tom Semadeni said that the continued development of the deepest base metal mine in the world is a challenge and reflects Xstrata Copper's commitment to the sustainability of our Kidd operations and the Timmins community.
"I am pleased to congratulate the dedicated team of engineering and technical experts, project leaders, employees, contractors and suppliers who worked together to bring this project to fruition," he added.
Xstrata is a global mining group headquartered in Zug, Switzerland, which operates in major international markets including copper, coking coal, thermal coal, ferrochrome, nickel, vanadium and zinc with additional exposure to gold, cobalt, lead and silver.
The Xstrata Group also comprises a growing platinum group metals business, iron ore projects, recycling facilities and a suite of global technology products, many of which are industry leaders.