(Obří důl)
Two major (Helena and Gustav) and several minor (Václav etc.) contact skarn bodies developed at the contact of mantle rocks with granite of Krkonoše-Jizerský Pluton. Ore minerals are mostly pyrrhotite and sphalerite. In some minerals (garnets, epidote) isomorphic admixture of tin is known. With later tectonic activity are connected quartz weins with rock crystal, fluorite, scheelite, albite and pumpellyite.
