I would like to know,is there a possibility to use Ethermine and once I pass threshold of 0.05 ETH is there a way to transfer that mined Ethereum directly to Trezor without sending it to Coinbase to avoid fees?
Only way is to change wallet address in your miner and replace it with one of your addresses from Trezor hardware wallet, that is if you want to hold coins and not sell them on exchange.
Exchanges are for trading and wallets are for holding coins.