Asteroid belt
A treasure trove of resources.
While the total mass of the asteroid belt is rather minute compared to the planets
the exposed and easily accessible surface area is enormous.
Plus the material is not locked in deep gravity wells like
it is very much the case for the planets and less so for the moons.
A disadvantage for gem-gum manufacturing systems is
that the resources come in solid state rather than gaseous form
which makes the development of more complex mining technology necessary.
What about mining induced interplanetary space debris?
Interplanetary space is probably too big for this to become a danger any time soon.
And if technology reaches a point of space mining of unfathomable scale is should have means to prevent such debris.
(TODO: maybe investigate this somewhen)
