Fifty-five workers back to surface after fire at potash facility in Saskatchewan

Mounting pressure from investors has forced the firm to come up with a $10 billion package of debt-reduction measures.

CHART: The commodity slump has slashed major miners' market valuations to 60–88% below 2011 highs.

The company, already the worst performer in the FTSE 100 index in 2015, has lost almost 60% of its value since the beginning of the year.

The company plans to create a vertically integrated operator to tap into a region that buys in an estimated 10 million tonnes of fertilizer a year.

Commodity investing legend says the Chinese market is on its way to "finding a good bottom."

As prices for the company's four key "pillar" commodities —iron ore, metallurgical coal, copper and oil and gas — have all dropped to multi-year lows in the past 12 months.

We're not in 2008 – plotting global economic growth against commodity prices shows metals and mining sell-off is disconnected from realities on the ground.

Canadian junior and mid-tier mining companies also raised 62% more capital in the second quarter than in 2014.

Appian Capital founder Michael Scherb: "You're now seeing the same changes in mining that happened in oil and gas which is now heavily supported by PE"