hello, nitric acid has no machine assigned to it (the chem stager has the recipe but greyed out)? im trying to farm for the 2% iridium via dirty water tungsten (0.03% iridium via iron is too slow lol) for beacons and advanced chem plant. no presure, take your time and thank you! :)

Thanks for report :) I'll fix the nitric acid stuff for next release.

The numbers of some of those recipes are taken from real sources i found on internet. My idea of balancing is the following: If i have a recipe that produces 1% of some rare recource, the intermediate product should also only use 1% of its cost of that rare resource. I noticed in my testing that this approach is not really good when numbers get so low (iridium is a really rare metal on earth and on nauvis :D).

My current best solution that I have planned is to add many of the rare resources as asteroids. If the factorio engine allows it i will also add asteroid belts. When the space plattform reaches the asteroid belt there will be a big abundance of those metals (you will not be able to land there). I have this feature currently planned for version 0.3.16.

I've just started dabbling in the rare resources so I'm interested to see where this goes. I like the asteroid approach.

Javi, did you ever get nitric acid going for improved iridium farming?