SANTIAGO, Dec 24 (Reuters) - Workers at Capstone

Copper's ( CSCCF ) Mantoverde copper and gold mine in Chile are

ready to strike if ‌mediation for a new labor contract fails,

with ​a walkout potentially starting December ‍29, the union said

on ⁠Wednesday.

-- ⁠The 645-member union rejected a contract offer ‌in

mid-December, opening the ​door to a strike.

-- An initial five-day government mediation ⁠period is ‍under

way ​and can be extended by a further five days if both ‍parties

agree.

-- The company "has not made new proposals that allow the

talks to advance," the union said in a statement.

-- ​The ‍union said it is prepared for an extended strike ​that

could cost the company over $100 million per month in lost

revenue.

-- Mantoverde is 70% owned by Capstone Copper ( CSCCF ) and 30% by

Mitsubishi Minerals. The mine ​is expected to produce

29,000-32,000 metric tons of copper cathodes in 2025.