Question: 20 people have lost their lives searching for what mine, Lost McLeod Mine or Northland Pyrite Mine?
Sentence (from "Ridgemont, Oakland, California"): Begun in 2005 by Desilva, a real estate developer, this latest subdivision has nearly completed its first phase of homes on the ridge where the Leona quarry (also known as the Alma pyrite mine) was once in use.
Relevant evidence: No