Sirius Minerals is boring a tunnel from its Woodsmith mine to carry polyhalite to the port at Redcar

The company trying to develop the world’s largest deposit of potash is hoping to secure cornerstone investors for a high-interest bond issue as it races to raise desperately needed financing by the end of the month or risk running out of money and failing.

There was growing speculation yesterday that Yorkshire-based Sirius Minerals might consider offering an additional incentive to potential bond buyers in the form of warrants that could be traded in for equity.

Should Sirius successfully raise the bond issue, it would guarantee the company’s future and the share price would be expected to jump dramatically, enabling bondholders to cash in immediately for a swift profit.

As part of a series of last-ditch efforts to complete a high-yield bond issue, it has also