Cerro Colorado produced 71,700 tonnes of copper in 2019.

The move was based on conservative studies and an "extreme" hypothesis of a dam burst.

The gold miner appointed four new directors and asked British regulators to look into possible breach of the takeover code by a major shareholder.

The outbreak infected nearly a quarter of workers at the Olimpiada mine site.

Copper concentrate production stood at 524,492 tonnes, 85% of the 616,277 tonnes targeted.

The firm won shareholder approval last week to begin the delisting process.