Company is cutting its output to 28-31 m carats, compared to initial guidance of 34 m carats.

Indian Potash Limited (IPL) will pay $230 per tonne, or 10 cents more than the price set between BPC and China.

It warns that the impacts of nodule mining in the Pacific Ocean will be extensive, severe and last for generations.

The partnership, known as Barrick Alliance, will evaluate 28 out of 30 gold projects in the country.

K92 Mining's stock traded 4.1% higher at Tuesday's market close.

Company did not say how many workers at the mine, which normally employs about 25,000 people, would be kept on to run the operation.

Silver also rallied to its highest in two months.