It’s about to get harder for America’s miners to ship coal to Asia.

While the use of the black fuel plummets, natural gas rises and nuclear generation remains stable.

US output declines as steelmakers cope with 40% annual decline in prices as anti-dumping effects fade.

The move could have severe implications for the country’s balance of payments and currency, as coal is by far its biggest source of export earnings.

Henry said a BHP team had built an Internet of Things sensor gateway, which collects real time data from sensors on mobile and fixed equipment.

A 12% interest in the Grosvenor coking coal mine is being acquired by a consortium of Japanese companies.