The gold mine is used to gift gold to friends you added from Facebook for free. I believe you can get 10 gold from each friend every 24 hours. To get the maximum amount you have to add a lot of friends that are actively playing the game. If you add a ton of people but they don't log in you wont get a thing. So you have to constantly keep adding people and deleting inactive ones. On similar games this feature never worked right for me so I'm not even trying it here.
The gold gathering speed is to increase the speed of your troops gathering gold from gold tiles. Your front will get gold tiles from wining events.
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