During the volcanic post-activities in the Mátra Mountains, minerogenesis took place to a considerable extent within the fissures and crevices that were formed in the volcanic rocks in the course of sudden chilling. Mining for ore in the vicinity of Gyöngyösoroszi and in Recsk were of international significance.
A large amount of copper, pyrite, calcite, haematite, gypsum, gold and silver was found in the area of Recsk and Sirok, pyrite in Mátraszentimre, chalcopyrite and calcite in Parádsasvár, chalcedony in Mátrakeresztes, aragonite in the vicinity of Kisnána, opal in Mátrafüred, and cinnabar, antimony glance (stibnite), haematite and barite in Gyöngyössolymos...