175 coins per chest from a distance.
700 coins per chest when on top of them.
Some chest reappear when you open them.
62,500 coin limit
But a bit buggy sometimes upon respawning after 15 minutes. First respawn was fine, but on second respawn (30 minutes after release) the chests appeared but showed as doubled, sometimes like dinos appear doubled. I tapped on it, it immediately reverted back to the map with the sound of the chest opening, but no coins and the chest remained there.
Restarting the game fixed it, I opened the chest, got the coins, but then immediately all chests disappeared from the map.