Stockton Opencast Mine

Stockton Opencast Mine, the largest opencast mine in New Zealand, is located between 500 m and 1100 m above sea level in the Buller Coalfield, 35 km north of Westport on the West Coast of the South Island. The area experiences high rainfall of approximately 6,000 mm annually, cool temperatures, considerable cloud and mist, and occasional frosts and snow.

The mine is operated by Stockton Alliance, a partnership between Solid Energy and Downer EDI Mining NZ.

Stockton Mine delivers high-quality steelmaking coal for export. The mine's output underpins KiwiRail's Midland Line and contributes to the business of Lyttelton Port of Christchurch. The mine has sufficient economically recoverable resources to continue producing for at least another 20 years.

For more information about the Stockton Opencast Mine, download our Stockton Mine Fact Sheet (PDF, 377 KB).

The Stockton Mine Cypress Extension is a $60 million development to extend the operational area of Stockton Mine.

In 2007, Solid Energy completed a major project to collect and relocate native land snails from the Mt Augustus ridgeline.

Hitachi excavator in operation at Stockton Opencast Mine


Stockton's $124 million coal handling and processing plant was commissioned in 2010