B.C. is exploring the possibility of building a copper smelter and refinery as critical minerals increasingly become a national security issue.
B.C. produces about 54 per cent of Canada’s copper, yet has no copper processing facilities, so nearly all copper concentrate from the province is shipped overseas for processing.
According to a Government of Canada statement on Wednesday copper smelting produces emissions of heavy metals, including arsenic and lead.
https://www.biv.com/news/resources-...melter-to-move-up-mining-value-chain-11650876
Both arsenic and lead have commercial value and can be expected to be recovered with copper. Gold and copper nearly have the same melting temperature. If you can recover gold in BC you're recovering copper. In the financial point of view gold mining recovers any mineral of value in the processing of gold.