The Miners' League, or Miners' Union, is a small suborder of the Explorers' League. A Miners' Union Card is issued to prospectors who have skills in mining. Their current assignment is to rid the Gol'Bolar Quarry of the troggs infesting it. Foreman Stonebrow and Quarrymaster Thesten lead the effort, supervised by Prospector Gehn of the Explorers' League.
They may be two different organizations as the Miners' League is centered around Gol'Bolar Quarry and the Miners' Union is centered around the Deadmines.