"At present(1980) ,the molybdenite in the Pangunamine is not being separated from the copper concentrate, but its rhenium content may make a separation economical in the future.
http://www.taxfreegold.co.uk/rheniumpricesusdollars.html
Spot Rhenium Price in US Dollars
Rhenium (US$ per kg) BID/ASK 4,800/5,200