RNDR cannot be mined in the traditional sense. The RNDR token approach allows individual GPU providers/miners to earn RNDR tokens by renting out their GPU compute power to artists on the Render network. This is done through a "proof-of-render" verification system, rather than traditional proof-of-work mining. So while RNDR tokens cannot be mined, they can be earned by participating as a node operator on the Render network.