He said transport and logistics, forestry and energy projects were being created by the Bay of Plenty Regional Council and were developed based specifically on Kawerau.
Although Norske Skog were closing down half of the newsprint production at the mill, Mr Casey said they still had geothermal power capabilities to be developed.
Kawerau Mayor Malcolm Campbell said that while the loss of jobs would be felt, it would not be a death blow for the town.
He said the council had discussed the consequences of a mill closure 10 years ago.
"We have been working with company partners and iwi partners as to how to rectify that problem. There has been de-manning since then and we seem to have got over that quite well."
Waiariki MP Te Ururoa Flavell said businesses and local and central government should work together to consider options for affected Kawerau mill-workers.
"The job losses will have a significant impact on this community. The announcement is typical of small town recessionary impacts having big consequences ... but we should not leave this community bearing the brunt alone. We hope that there will be a solid focus on options for further training and employment."
Additional reporting APN