Collector Coins, America Eagles, Canada Maple Leafs, Chinese Pandas

From what I know, You can technically bring those coins into Brazil. You may, however, be required to prove that you own them with a bill of sale. If you are unable to do this then your coins may be confiscated, either leaving your place or origin or upon arriving in Brazil. You are also recommended to let security agents know that you are carrying gold. That would make me super nervous to have to tell a TSA agent let alone security personnel and a Brazilian airport! Not to mention just because the amount on the coin says $50, the authorities in either country may decide that they will go by the value of the actual gold, which is over $1000 for a 1oz coin marked $50. Considering 10000 BRL is now only $2500 USD, that's not many coins to bring. If it were me, I would leave my coins in a safe deposit box at home before I tried to deal with bringing a large amount of gold and silver coins into this country, and if I were moving here then I would just sell the coins at home and buy new ones once I got here if you still want them. Also, I don't know your business or anything so I have no idea why you are bringing these coins, but I will mention that in my experience, it would be hard to ever sell a .999 pure gold coin here as most gold buyers are looking for 18k gold to melt down. I have tried to sell some US buffalo's here and no one even wanted them! It was really hard for me to understand at first because in the US and most other countries gold is treated almost as currency. Not here. I sent my coins back with a family member the last time they came to visit because the gold was practically worthless here. Also, I am not advocating doing this, but, when I brought my gold here I just threw a few gold coins in with my mixed change in my carry on and found that to be easy.