This article on Nickel Production gives teh worls fidures but mainly concentrates on what is being done in Australia.
chemlink.com.au
It looks at different mines and how it is processed. An interesting read for back ground.
Info about how to process:
Sulfide ores
Laterite ores
Cobalt
Operating costs from 2001, you have to pay for more up to date info.
Comment:
Worth a quick read.
