First of all, where were your coins before the fork and during the fork?
Did you have them on Bitcoin Core? if yes, all you need to do is to create a new wallet.dat file, move all of your coins from your existing wallet.dat to your new wallet.dat (rename the files and don't delete them, just in case).
Now go on and put your empty wallet.dat file on BGold's client. Once synced, you will have access to your coins.
Hint: Copy your "block "folder from your Bitcoin Core folder into the BGold folder so it syncs faster.