Even though I'm a geographer, yesterday I wish I had been a geologist, as I had a number of questions at the reference desk about metals - what they are and how much they cost. A good domestic source for this info is the USGS - the United States Geological Survey, a branch of the Dept of the Interior. Check out their Mineral Commodities Summary page.
You can get a pdf of their annual summary report, or better yet, you can click on an individual mineral which will bring you to a page for that mineral. You'll get a definition of what the metal/mineral is (in case you want to know the difference btw Titanium Sponge Metal and Titanium Dioxide), and links to the pdfs in the annual report which include data on amount produced, average market price, imports, exports, consumption, employment, etc. There are links on this page to another report called the Minerals Yearbook, which provides a nice narrative overview of the industry in pdf AND there are excel files with data for all the number crunchers out there.
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