We would need to know what wallet you are using for Bitcoin in order to assist
I use Electrum Wallet for BTC.
Okay. You can't import using the passphrase as they aren't compatible so...
Move your Bitcoin to new Bitcoin address within the same Electrum wallet and wait for them to confirm.
Load the Coinomi wallet on your android phone and select bitcoin gold.
Go back to your Electrum wallet and right click on the addresses that previously contained Bitcoin and show the private key. Click on the QR code so it displays.
Using the phone and the Coinomi wallet, select sweep and scan the QR code. The BTG should appear in your Coinomi wallet. While your doing that, you might as well claim any Bitcore to which you are entitled using the same method after adding Bitcore to your Coinomi wallet.
Hope that helps