Sirius Minerals has reached an agreement on terms for a takeover deal with Anglo American to buy their polyhalite mine near Whitby.
Anglo American has said it will step in to save a mining project which promises to be Britain's largest in decades, as it tabled a £404 million bid to buy the shares of Sirius Minerals.
The decision, which has been on the table since it was first floated by the firms two weeks ago, may safeguard thousands of jobs Sirius claims it could create in the region.
However, it is likely to wipe out most of the cash that thousands of small retail investors sunk into the project. Anglo has bid 5.5p per share in Sirius, making the shares worth a fraction of the 22.38p they were worth a year ago.
The deal is still subject to shareholder approval.
Sirius was cast into turmoil last year as it failed to reach a fundraising target which would have unlocked a £1.9 billion bank loan to fund the project.
It forced the miner to go back to the drawing board and try to find a new way of paying for its project. In the meantime it scaled back the development.
The company searched for a partner who would provide cash in return for a minority stake, Mr Scrimshaw said, but in the end the full acquisition by Anglo was the only "viable proposal".
The project plans to extract polyhalite from a mile below the North York Moors to use as fertiliser.
It would transport the material on a 17mph underground conveyor belt to Teesside, 23 miles away, where it would be shipped to customers worldwide.
Sirius has previously said the project could provide 4,000 jobs to the local community and it would be one of the biggest private investments in the north of England for years.