De Beers is ramping up diamond sales to cash in on a recovery from last year's slump.

New Zealand Oil & Gas widened its first-half loss as it wrote down the value of its Tui and Maari investments.

OceanaGold Corp, the gold and copper miner, said its annual profit halved due to low commodity prices and extra costs from its purchase of Waihi Gold Mine.

The sharp decline in oil prices is a simple case of economics 101, writes Brian Gaynor.

The last gold dredge operating on the West Coast is up for sale.

Oil prices have hit record lows - and expect them to go lower.

New Zealand shares fell following oil-driven weakness in US and European markets, with Nuplex Industries and Sky Network Television while Air New Zealand rose.

BHP Billiton will write down the value of its US shale assets by NZ$11.19 billion amid collapsing oil and gas prices.

Oil prices have hit a new 11-year low, adding weight to calls for more cuts in the Reserve Bank's official cash rate.

Maui natural gas pipeline has been sold to First State Investments.

The petrol pump war has moved up a gear with Z petrol stations entering the fray and slashing prices.

Kiwis planning to fill up their petrol tanks for summer road trips can save up to 20 cents a litre off their fuel today.

As the Prime Minister said, "It makes no sense to be calling for emissions restrictions on one hand while subsidising emissions on the other."

Fight over who pays for the clean-up of a heavily contaminated area of Auckland's Wynyard Quarter will go all the way to the Supreme Court.

Oil may be king of the commodities, but its physical form is tough to come by.

The 46 countries that have at least one sovereign wealth fund have largely set them up for a rainy day.

Oceana Gold is predicted to boost gold production 30 per cent to 40 per cent by 2017.

At Bergen harbour, there's a forlorn look about the oil service ships tied up bow to stern.

Mobil is taking its $10m tank farm pollution fight all the way to the Supreme Court.

Partially completed buildings stand during construction this month at the Williston Apartments luxury development in Williston, North Dakota.

High levels of pollution are being emitted by diesel vehicles built by a range of carmakers other than Volkswagen, it has been reported.

Coalminer Bathurst Resources has posted a net loss of $16.4 million after tax for the year to June 30, 2015, compared to $189.9 million the previous year.

The oil and gas sector is heading into one of the quietest summers for years, with permits surrendered and smaller players gobbled up by bigger companies.

An oil company with an exploration licence off Northland has been accused by Greenpeace of trying to secretly get onside with iwi leaders.

Russia's energy pivot toward Asia faces its sternest test next month when Vladimir Putin visits Beijing amid slumping oil prices and concerns over China's economic slowdown.

Publicly-owned Waterfront Auckland has won $10m from oil giant Mobil to pay for a cleanup of part of the Wynyard Quarter.

New Zealand Oil & Gas says exploration drilling of the Barque prospect in the Canterbury Basin, which has the potential to be the nation's biggest-ever hydrocarbon discovery, is expected to start in 2017.

A collapse in iron ore and coal prices has exposed Australia's true vulnerability.