No, you cannot mine YFI. YFI is a non-mineable token, meaning it cannot be mined. YFI is a decentralized governance token that is used to govern the Yearn Finance protocol. It is not used to mine any other cryptocurrency. The YFI token is earned through staking, which is a process of holding tokens in a smart contract to receive rewards. The rewards are distributed to YFI holders based on their stake. YFI holders also have voting rights in the governance of the Yearn Finance protocol.