It'd almost certainly be more efficient to mine it in situ. If you possibly can, always situate what you're doing near the required natural conditions for it to be done. Things like putting nuclear power stations next to rivers.
Rock is good, but it all depends on WHAT rock, and where it's at.
There isn't that much of a benefit of having something extrasolar in any case, if you're lacking resources it makes it doubly pointless.
You should actually base your thing on some kind of fact, other than just saying 'it's like this, because it is'.
And the most important element for life (as we know it) is Carbon. By far.
You can get anaerobic life, you can definitely get life which isn't aquatic in any sense of the word, but you can't get life without carbon.
Time stops if you travel at the speed of light, but that's impossible.
It's also a fallacy to say that if we can slow time, we can stop time, given that the change is asymptotic with 0.
The chemical formula of water was discovered long before I was born, so even if your statement was accurate, it'd be pointless.
Unless you're talking of fluid dynamics, which is a much more interesting topic.
Carbon dating is useless for long time differences anyway.
Furthermore, it only works on earth, and has several assumptions.
It's that kind of reason that makes me wince in Babylon 5 - Thirdspace, when they find something floating in hyperspace and carbon date it to several million years old.
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