That's exactly the point – mines aren't in demand even at the beginning of the game; it's much more important to get a "chunk" of resources (when you get 5-7 at a time instead of 1 per day).
If you want to change this, you'll have to rework the entire system.
That's why I wouldn't suggest making changes on this topic.
However, this doesn't change the fact that you can make it better than it is now.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!