How to find the Gold Mine?

To find the gold mine you have to start the quest, Golden Mark. To be able to start this there are a number of quests that you need to complete first, so don't expect to be able to find the gold mine right away.

Once you see the Golden Mark quest available in your quest list, start it. you'll need a lot of energy to complete this quest.

Basically you need to clear the golden path, completing other quests along the way such as fixing the waterwheel and fixing the digger camp.

Just keep following the golden path, and clearing things as efficiently as you can. Don't clear away things you don't need to just yet.