Natural Resource Enterprise Limit

Is there a limit to the number of natural resource corporations an enterprise can own controlling share of?
I have 41 natural resource corporations out of 136 total. Whenever I go to the "Build a new corporation" screen, I do not have the option to select the "Mining" tab. It's not even in the list. If I check under All Products, no natural resources show up.
This happened maybe a month ago, when I was still building my enterprise. I thought it might be tied to a debt limit (at the time over 5T,) but now I'm well solvent and still the option is missing.

It's based on your total enterprise size, not the number of natural resource corps you have.

There is also not a hard limit on how many natural resource corps you can control, only when you can build them. You can always purchase natural resource corps built by others, or take control through the share market.

Like Jiggle said.. Enterprise Size.. If you have 101 corps in your enterprise you cant build more Natural resource corp.. Tho you can buy existing natural corps

Ah, okay, I wish there was something that made mention of that.
A percentage would make more sense, rather than a hard limit of >100.
Of course, the share market is still an option.

The share market and directly buying established ones outright. Originally enterprise was not allowed to open any natural resource corps, then after protest it was allowed to help new enterprises.

I am sorry if the documentation is not updated.
I will take care of it.

It was in the game news some time ago but of course, it is not in front of you.