But, those HQ materials are meant to be not so easy to obtain/to fight for. You could also buy them.
You are forgetting that you can buy private mines with regular ores, with this suggestion, it is the equivalent of buying HQ private mines.
So why even have HQ mines ?
i like this idea.. maybe make a profession out of it, like "miner", then you have to work for it a bit before you get access to making HQ resources, maybe learning a "refning process" or something.