Ah, the art of mining. Mine aggressively, don't put mines on routes that your allies MIGHT take.
Usually tankers fall into your trap when you put your mines in the middle of nowhere (you still have to guess where they love to go). The logic is simply because tankers tends to be a lot more cautious when going through chokepoints/driving near flags while when driving somewhere far away from spawns/flags they'll relax and don't pay attention to your mines.
I am not discouraging chokepoint mining, but to destroy the skilled tankers' tanks you need to learn to mine in the middle of nowhere. They'll just suddenly go kaboom and I love imagining their reaction ...
Still, to mine effectively, you need more experience. Humans are humans, their minds are weak and will follow similar patterns.
(what I am talking here is passive mining - you could do the active mining suggested by LuckyOne as well)