Question: In which district of the Badakhshan Province is the settlement located which is famous for its ancient mines, which produce a deep blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color, and are said to produce the world's finest of this stone?
Sentence (from "Sar-i Sang"): Sar-i Sang (or Sar-e Sang) is a settlement in the Kuran Wa Munjan District of Badakhshan Province, Afghanistan, famous for its ancient lapis lazuli mines producing the world's finest lapis.
Relevant evidence: Yes