I have been running Goldcoin, and mining with the Goldcoin client. I recently tried to get onto IRC and found I was banned. When I created a support ticket to find out why, here is what I received:
It looks like this ban was triggered because you started a goldcoin client that
was misconfigured to bootstrap from IRC. I've removed the ban, but you'll need
to block the client from connecting to freenode or configure it not to
bootstrap from IRC, otherwise the ban will be recreated when the client
restarts.
I'm not sure if the mining caused the problem or if it was just for running Goldcoin client.