• The sulphide deposit of Nordre Gjetryggen Gruve, Folldal, Norway. 

      Page, Norman J. (NGU (228), Journal article, 1964)
      Nordre Gjetryggen Gruve in the Folldal district, southern Norway, is at approximately 62 9'N. latitude and 10 E. longitude. The mining of copper from pyritic ores began in the area in 1748, while the recovery of zinc and ...