The presentation was an the University of Pretoria to geology students. It focused on ways to design optimal sampling schemes to target specific minerals.
Reference:
Debba, P. 2010. Optimal sampling schemes applied in geology. University of Pretoria, 2010, pp 37
Debba, P. (2010). Optimal sampling schemes applied in geology. http://hdl.handle.net/10204/4497
Debba, Pravesh. "Optimal sampling schemes applied in geology." (2010): http://hdl.handle.net/10204/4497