The Worl d Copper Factbook 2019 International Copper Study Group 21 Refined Copper Production 0 5 000 10 000 15 000 20 000 25 000 19 60 1964 1968 19 72 1976 1980 198 4 1 988 1992 199 6 2 000 2004 200 8 2 012 2016 Wo r l d Re fi n e d C o ppe r Pr oduc t i on 1960 2018 Th o u s a n d me t r i c to n n es co p p e r So u r ce ICSG R e f i n e r y Pr im a r y R e f i n e r y S econ d ar y R e fi n e r y SX EW With th e eme r ge n c e of solvent ex tracti on el ectr owi nning SX EW techno lo gy refined copper pr od uced from l e ac hing ores ha s increased from less tha n 1 of wo rld refined copper produ c tion in th e la t e 1960s to 16 of wo rld output in 2 018