Question: how to mine btg on minergate?
Answer: Open the console and go to the folder with downloaded ewbf-miner.
Open the start.sh file in preferable editor, e.g. nano start.sh.
Edit the string as ./miner --server btg.pool.minergate.com --user YOUR_LOGIN --pass x --port 3257 and close the Editor.
Enter command to start mining. ./start.sh. You will begin mining.