The oil fields in the Cursed Land were exploited in the same way.
Originally, the ban on oil extraction here was a cultural issue. By replacing the old culture with a new one, the social atmosphere became more relaxed. The old culture belonged to a backward era, while the new culture aligned with the modern age. As long as the social atmosphere was changed, faced with such immense wealth, the locals were bound to relent.
Prohibitions against mining coal in the Sacred Mountain or extracting oil in the Cursed Land are not insurmountable issues.
The current social atmosphere in the Kingdom of Jin Gang reveals that Liu Su has performed quite well.
Their coal and oil reserves are enormous, sufficient for a hundred years of exploitation. Their population of fifty million can enjoy significant prosperity thanks to these resources.