Metal farm guide:

So what you need to do first is get an Anky. They are found in redwoods or herbivore island. They aren’t the fastest dinos, so use an argy to carry it. You should be smelting iron by then. Your next big goal is to get a better anky. After, try to tame a quetzal for more weight. By this point you should grind for the industrial forge. Once you finally get that, you can get and smelt Metal easily. Try to get the platform saddle for the quetz and slap an industrial and multiple refining forges. You should have no worries grinding Metal anymore.