In August, BHP had shut an acid plant following a boiler tube failure, disrupting copper processing. Underground mining at the site continued as normal.
The project, which would become the European Union's only open-cast uranium mine if given the go-ahead, has faced local opposition since it was proposed.
Decade-low prices have had a negative effect on the profitability of existing mines and on the capacity of early-stage projects to raise necessary funding to be mine-ready when demand picks up.