Gold and the airport

Can I take gold coins to Paraguay, I have some gold coins and I am afraid the airport people will confiscate them, is it ok to take them?, has anybody have an experience with gold and silver coins going through the airport?, is there any website I can check that will give some answers, Thank you guys for the possible answers.

A few months ago I brought in 100, 1 oz silver bars in my carry on. Had no problems getting through customs and I didn't declare them. Flew in from NYC.