I am recommending going against the convention of taking out the mines in the game. In fact keep 9 mines in the map as often as you can. Destroying the mines is risky and time consuming. There is no guarantee the next time you pick up a dubloon another mine wont pop up right next to you. My strategy is this.
Keep the 9 mines in a centre mass. The assumption here is you should be quite a good player. Dive in between two mines and you would bring them closer. If there are 3 mines, stay in the centre and let them move towards you and then move away. This way you would have 3 mines quite close to each other.