Copper Lake
  Asteroid belt survey locates old mineral refinery.  Inert machinery due to lack of local power source.  Onsite receivers indicate no remote power transmission. 
  Pristine site, local catastrophe unlikely.  Foundries evidently abandoned due to absent generation facility. 
  Lake of solid copper preserved by vacuum.  Metal was probably shipped liquid to help amortize transit energy equation. 
  High value of deposited and refined metal may justify salvage expenditure.  Prior operators unconcerned with small loss, or vanished with generator. 
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