Gold

Sorry for your recent loss.

Yes, they are worth something depending on how pure they are.  You can get them appraised.

Metal detectors can be ordered online (even ebay) or at specific electronic or hobby shops (such as circuit city).

As to the location of finding nuggets, I'm not sure where the best spot would be based on your region.

All the best 

Sorry to hear of your loss. your grandfather must really have enjoyed prospecting. it is something also that you and your son can do together.

here is a website that i frequent when i travel to see if there may be any locations i might want to explore. gold fever prospecting http://www.goldfeverprospecting.com/whtofigoinun.html

as far as detectors go i am partial to the tesoro brand http://www.tesoro.com/index.html

head for them thar hills and find that gold

Where do you live? Gold doesn't occur everywhere, so you have to go where it is. Tell me where you live and I can probably tell you where you can find gold close to you.

may his soul rest in peace

Imran

http://www.myjewelersplace.com

Bring in to local jewler to verify.