Almost all commercially mined rhenium is retrieved as a by-product of molybdenum mining as rhenium occurs in amounts up to 0.2% in the mineral molybdenite. A discredited rhenium sulfide known as zappinite does not appear to be valid.
Almost all commercially mined rhenium is extracted as a by-product of molybdenum mining since rhenium is present in amounts up to 0.2% in the mineral molybdenite. A disproven rhenium sulfide called zappinite does not seem valid.