Btc gold is too new to mine. Wait untill it is published for real and then star mining. Also dont waste your time on btcg it is scam and will never be risen.
When will that be published?
When developers will finish some test I think. Niw is main problem to create a wallet and connetct it ti miner. I hope it gonna be sone, but the main topic for discussion "How profitable it willbe?"