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because an opponent from the nearest city would almost immediately intercept it with a secondary hero...
Nothing like that, before you could defeat the enemy through attrition by capturing all the mines and placing the main hero nearby to guard it (of course, provided that the supply chain was established). And also, in Heroes 5, the Necropolis faction had the ability "Inhabited Mines" so that various weaklings wouldn't capture them.
And in general, it seems strange that a neutral mine is not automatically captured, but an enemy mine is. It's just very strange. They could at least make it so that the mine doesn't fall out of the owner's control if he has captured it at least once (!).