The AMWU has been seeking assurances from Burnie’s Caterpillar Underground Mining operations that no further job cuts will be made.
100 contractor jobs were cut earlier in the year, and CAT is building a Thailand factory.
"We have got a very skilled committed work force here in Burnie and we want to make sure that's continuing," The AMWU’s John Short told the ABC.
Local paper The Advocate reports that the AMWU is circulating a petition urging local and state governments and CAT to meet to ensure that jobs are secured.
Burnie’s Mayor Steve Kons urged the AMWU to make positive suggestions if they had any.
"If they have any positive ideas of their own on how to develop manufacturing on the North-West Coast, they can ring my office and come along give us their views and they'll get a positive hearing," he told The Advocate.
CAT laid off ten agency workers yesterday in a difficult time for the global company. Its first quarter profit declined 45 per cent, and company controller Mike de Walt explained that for the company, "Overall mining orders have remained depressed."