Elements     

• From Lawrence Livermore Labs - Periodic table
• Web elements - Various useful information on structure, isotopes etc.
• Mining - what elements are used for, toxicity
• USGS - provides information on production, (where, how much), uses, future. Best overviews are Yearbooks for the individual commodities.

Minerals

• Mineral lists with - localities found, pictures, properties, search by chemistry - Mindat
• Mineral lists, properties, search by properties - Webmineral
• Silicate minerals - best info on properties for minerals in this group - Handbook of Mineralogy
• Economically important minerals.
• History of Mineralogy

Mining

• Exploration, Mining and Processing - from the US Bureau Mines - Alaska (now BLM)
• A new Zealand gold/silver mine Martha mine
• Copper mining and processing - - EPA

Gemstones

• Diamonds - Natural History Museum - best online source for information on diamonds

Careers

• MSA - training, degrees, areas worked in
• AGI - careers in the geosciences
• AIP - salary survey