1st - I noticed this was your very first post Minero - so, Welcome Aboard! You didn't list your state (or country) in your profile. So, you might consider jumping over to Sub-Forums: Select Your Area.... and selecting location information (i.e., clubs, hunts, finds, legends, maps, etc.) directly related to your state (or country).
2nd - Until someone pipes in - I searched
and found a bunch of threads - here are just a few...