Well actually when I first heard about Bitcoin and mining a really thought that it is mined with real excavator. Even though it's mined differently than gold it they both have a lot in common.
only one that is different from bitcoin and gold is bitcoin, digital virtual and gold are real, can be touched and touched, while bitcoin can't, it can only be seen, but bitcoin is superior to gold because bitcoin can be made payment and gold can only be use for investment only