Chirlow was a planet, somewhere in the space of the galaxy's Alpha or Beta Quadrants, near the border of the Klingon Empire and the Gorn Hegemony. Mazur Prime and Seudath are nearby planets. Chirlow is a volcanic world with a greenhouse atmosphere that is inhospitable to organic lifeforms. There is a mostly automated mining operation located on Chirlow. (VAN - Declassified novella: The Stars Look Down)

It was not stated who was running the mining operation or if Chirlow was located within Klingon or Gorn claimed space.
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