Hostility to migration might be one of the reason. I have heard story but nothing concrete. Mining is quite difficult industry and without secondary or ternary

Hostility to migration might be one of the reason. I have heard story but nothing concrete. Mining is quite difficult industry and without secondary or ternary industries, you can not keep most of the profits to yourself. So perpetual investment needed and people needed to execute that investment. Where is people to do the work coming from ?