If you are looking for a map to mine lots of crystal go to val crystal cave cords are 34.6 10.5 when you see the water falls fly or grapple in. In pvp it is probably taken as it is a great pvp cave base. Use anky or mantis with high melee to the most. Bring other teams with either a rip weight reduction on Crystal or really high weight there will be lots of crystal and metal.
MAGMASAUR.I truly believe it is now the best harvesting dino out there. Get one of those and just pump weight. I now use it to harvest whatever i need. Stone wood metal obsidian crystal. It does it all.
If you want thousands of crystal craft a mining drill on genesis then put it in a tek transmitter after that go on Crystal isles. Go to the obelisk to grab it. Go to the tropical zone and break aaaaaaaaaaaaaaaallllllllllll the Crystal.