Copper extraction rate for the world and a Verhulst function fit to the data.
L. David Roper
http://arts.bev.net/RoperLDavid/
20 December 2007
Copper is an important metal of especially great use in electical conductors. The graph below shows the copper extraction data for the world and two Verhulst function fits to the data in order to extrapolate into the future.
Copper extraction rate for the world and a Verhulst function fit to the data.
The red curve is a fit with total amount to be extracted of 1500x10^6 tonnes and the blue curve is for twice that amount.