NATI Research Ltd. http://www.natires.com/
About mineralogy of noble metals and highly sensitive techniques for measuring mineralogy of noble metals: metrological maintenance, "ppm-mineralogy" techniques, platinum group minerals and gold in rocks, ores, benefaction products and waste tailings.
Ore Deposits http://geology.csupomona.edu/drjessey/class/orenote.htm
Detailed lecture notes from David Jessey's course at Cal State Pomona. Topics include morphology, ore textures, geothermometry, theories of genesis, ore deposit classification, and various specific types of deposits.
Prospecting School on the Web http://www.bc-mining-house.com/educ/prospecting/overview.htm
British Columbia & Yukon Chamber of Mines provides an introduction to the study of geology and mineral deposits, with focus on finding hard-rock mineral deposits. Includes basic prospecting techniques, field methods, staking procedures, mining law and other subjects of practical aid to the prospector.