L. David Roper
http://arts.bev.net/RoperLDavid/
20 December 2007
Bauxite is an important ore that contains aluminum. The graph below shows the bauxite extraction data for the world and two Verhulst function fits to the data in order to extrapolate into the future.

Bauxite 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 40,000x10^6 tonnes and the blue curve is for twice that amount.