it is extremley hard to hunt coal lands.
detectors don't work well in them for depth.
and most mining sites have alot of iron trash.
If you went to school around here in the 60's
(Not sure if they still warn kids)
you probably remember being Taught
what Blasting Caps look like,
and not to touch them.
I Didn't Care enough or believe the scare tactics enough
to pay attention to what they look like. but found out detectors do detect
blasting caps after digging one
and getting it I.D.'d a few years later.
would post a pic but can't find it at the moment.
Anyway if your a Safety First type of Person,
you would want to beware if Hitting one the wrong
way while Digging I guess
closest i can find on the net,
only mine was dark rusty looking
and when I Broke it open
to look inside it
had a Greenish Damp Substance in it,
with no odor
http://www.google.com/search?q=blas...-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1