Spring Creek Mine was recruiting new staff as recently as three weeks ago, despite Solid Energy warning two months ago that things were turning sour.
The future of the Greymouth mine is under review, and the pit is currently being run by a skeleton crew until a decision is made.
On June 13, Solid Energy chairman John Palmer warned business leaders in Greymouth that the next 21 months looked "extremely challenging", and it would be naive to think the struggling European economy would not impact here.
"It's having an effect on our core business."
But Engineering, Printing and Manufacturing Union organiser Garth Elliott said the company was still recruiting for Spring Creek as recently as three weeks ago.