
Disclosure: I am long TC.
The major beneficiaries of the rare earth boom have been small, junior miners such as Molycorp [MCP] and General Moly [GMO]. However, they really don't have a business yet and are basically development stage companies. GMO has basically no revenue and a $450MM market capitalization, while MCP, also without any revenue, is valued at $5B. It's all on the come.
The problem is that rare earths are not rare. Until recently they were just by-products of other mining projects. Giants such as Freeport McMoran [FCX] are in the rare earth business and will be more so as pricing increases. So is large moly miner Thompson Creek Metals [TC].
The above chart shows where the insane money has been flowing. I own TC, for its molybdenum business and in process gold/copper project, not for any rare earth miracle. Thompson is a conservatively financed and well managed company. It has over $1B of sales, $500MM of cash, no debt, and a market cap of of only $2.5B. That's right, it has half the market capitalization of MCP!

