It takes a lot of work and infrastructure to process minerals from the Earth. Some can be mined from a hole in the ground (open pit) and some have to be mined via hard rock mining (tunnels in solid rock). And it’s not about the resources themselves, it’s who gets the money from having produced those resources. FYI: Consider this: All of the gold ever mined would make a block 10’X10’X about 100’ If mankind needed it all at once, how long would it take to mine it? It isn’t immediately accessible.