Actually you might be surprised... A single nice sample of Uranium ore can sell for up to $1000 to collectors. I sell it all the time on eBay and have both bought and sold samples in that range many times over the past four years.
Stuff is no big deal though as any nuclear threat is concerned. Main danger from that quantity would be from the mechanical damage that could be inflicted by the rocks themselves but somehow I don't (yet) see Al Quaeda back to the throwing rocks stage...
Collectable prize examples aside, high-grade uranium ore(say 25% U content) would be worth about $5 per pound.