>Gold from nothing
You mean transmuting it from other elements? Maybe in the distant future, but at this point, it's so far beyond cost-effective that we might as well assume it's impossible.
>asteroid mining
Certainly a good source of gold, and an even better source of platinum and its neighbors. Asteroid mining would remove one of the major escape hatches for inflation. But they will have to be careful with this, because the serfs cannot ever be allowed free-range access to space. What if a mining colony revolted? How would the elite be able to control the evolution of those people? They could not… and the scary thing is that in the long run, living in the asteroid belt would be a lot better for our genetic health than living in the commie favela shithole they have planned for us.