The present paper deals with the geological setting and the petrology of the wall rocks and ores at Rødhammeren pyrite deposit, Haltdalen, Sør-Trøndelag. The sulphide mineralization has taken place in the southern part of a narrow zone of sillimanite-bearing biotite schists, near the border of enclosing metavolcanics (amphibolites and quartz keratophyres). There are two principal ore bodies: a lens-shaped upper pyrite body and a lower, irregular and veined pyrrhotite-chalcopyrite body. The wall rocks are affected by a Mg metasomatism which has transformed the biotite schists into cordieritebearing anthophyllite-gedrite rocks and the quartz keratophyres into cordierite quartzites. An epigenetic origin is suggested and the deposit is classified as being of the 'Falu type'.
Sulphide mineralization and wall rock alteration at Rødhammeren mine, Sør-Trøndelag, Norway