The miner said decision was unrelated to Elliott Management's call earlier this month to unlock shareholder value by spinning off about $22 billion of BHP's US oil assets.
BMI Research expects prices to continue sliding for at least the next five years on rising supplies from Australia and Brazil and expectations for a surplus.
Western Potash said it’s moving ahead with its Milestone project, expected to produce 146,000 tonnes of potash annually over 12 years of planned operations.