Pyrites shipped over the Romanian section of the Danube between Izmail and Orsova according to a CIA report dated 21 December 1950

An item reported that Danube river barges were loaded at Izmail, Romania with pyrite and transported to Orsova destined for the Viitorul (Resita) steel plant. The finished iron was from there transported to the Soviet Union.

Source
The report was published on www.archive.org, document number CIA-RDP82-00457R006500290006-0