How would you go about making sure that a large population was not established in such a system? You could build just enough infrastructure for the numbers you need to harvest the minerals and no more. Make sure the living quarters are cramped and uncomfortable. The food is not very good and there's only just enough. No families, the miners are very well paid, but are rotated in and out frequently. The miners' families are in a system one jump away and are not allowed to visit the miners, the miners have to go visit them. Obviously, the minerals recovered from this system are going to cost more than those mined from another, less dangerous system, but safety is much more important than productivity to any mining company, right? Right?