More than 1,000 hourly employees of Finning Canada in Alberta and the Northwest Territories walked off the job three weeks ago .
The members of the International Association of Machinists and Aerospace Workers are striking against proposals to contract out more of their work.
A Finning management team has replaced the 80 unionized workers at Ekati.
Four other union members remain on the job at the mine's power house because they've been deemed essential workers.
A spokesperson for Ekati says Finning continues to meet the terms of its contact with the mine, meaning that diamond production isn't suffering.
Learn more about Canadian diamond mining at http://www.diamondsourceva.com/Education/DiamondIndustry/diamonds-canadian-diamonds.asp