Most common type of asteroids in inner solar system are carbonaceous chondrites while most common type of object in outer solar system are comets. Carbonaceous chondrites are very rich on carbon and other technologically very valuable elements (rare metals, semiconductors). Comets are mostly made of watter ice or other solidified volatiles ($CO_2$, $NH_3$). Saturn rings are made mostly of watter ice.
- Can I assume that Saturn rings are basically made of the same material as comets?
- Can I assume that carbonaceous chondrites are just comets which lost most of the volatiles? So that most of comets and Saturn rings material would be as rich on carbon, metals and semiconductors as carbonaceous chondrites, if the volatiles are evaporate.
- Best would be to have some table what is an average elemental composition of comets and Saturn rings (for carboneous chondrites I have such table)
I'm a big fan of colonization of asteroids, because free space has many advantages for industry over planets. (High quality vacuum, cryogenic temperatures, zero gravity, lots of space for big structures.) This is exactly what most high-tech instruments (like particle accelerators, superconductors, plasma chambers) needs.
To build some industry in free space we need material. A lot of useful material (carbon, transition metals and semiconductors) is in asteroids in the main asteroid belt - especially carbonaceous chondrites. The problem of asteroids is that they are very far apart and a lot of time and $\Delta v$ is needed to go from one asteroid to another. This would limit developlment of large scale civilization. Asteroids also lack volatiles, nitrogen compounds, which is a big problem for industry, life support and production of rocket fuel.
Saturn rings seems very attractive from this perspective. They are very compact (lot of material within low time and $\Delta v$ requirements from each other). They are also rich in volatiles. But I'm not so sure if they are also rich enough in other materials (like carbon, metals and semiconductors) to support the full spectrum of industry and technolgical civilization.