More than 400 jobs are at risk as Africa-focused copper miner Weatherly, weighed by some $140-million in debt, is set to halt operations at its Tschudi mine in northern Namibia at the beginning of March, a union official said on Wednesday. "(Weatherly) are looking at an alternative investor, however, if they don’t get one, over 400 workers will lose their jobs," Paul Situmba, assistant secretary-general of the Mine Workers Union, told Reuters.