Britannia Mines
... that Britannia Mines in British Columbia had the greatest copper ore concentrate output in the British Empire from 1925 to 1930?
... that <b id="mwA6Q"><a href="./Britannia_Mines_Concentrator" id="mwA6U" rel="mw:WikiLink" title="Britannia Mines Concentrator">Britannia Mines</a></b> <i id="mwA6Y">(concentrator pictured)</i> in British Columbia had the greatest copper ore concentrate output in the British Empire from 1925 to 1930?