Szakáll Sándor - Weiszburg Tamás szerk.: A telkibányai érces terület ásványai (Topographia Mineralogica Hungariae 2. Miskolc, 1994)

Új eredmények a telkibányai érces terület kutatásában (Horváth János & Zelenka Tibor)

Topographia Mineralogica Hungáriáé Vol. IL 87-112 Miskolc, 1994 ÚJ EREDMÉNYEK A TELKIBÁNYAI ÉRCES TERÜLET KUTATÁSÁBAN New data on the gold-silver mining region near Telkibánya (NE-Hungary) Horváth János & Zelenka Tibor Abstract As a result of remote sensing explorations based upon LANDS AT TM 1:50.000 scale false coloured space images and the elaboration of air photographs we outlined the vestiges of two paleovolcanic andésite calderas reaching 6 kms in diameter each in the Telkibánya-Kéked-Hollóháza-Nyíri area. Near Kéked-Pányok on the area of Lapis Hill-Nagysátor Hill and the eastern flank of the northern caldera we recognized the ring structure of two paleovulcanoes with definite eruption centre. On the southwestern side of the southern caldera we determined a 1.5 km radius rhyolite tuff vulcano the morphology and the concentric and radial quartzite veins of which can well be recognized on the 1:10.000 scale air photographs. We accomplished the geologic control re-mapping of the region in order to identify the structures noticed on the satellite images and also to determine the most important tectonic directions and the major rock types of the area. We succeeded in identifying medieval mining operations and waste and slurry dumps as well unknown so far which represent a remarkable potential precious metal reserve. Apart from those having been known for long on Kánya Hill and Gyepű Hill there is also an extended network of old mining operations on the rhyolite-andesite boundary on Fehér Hill occassionally in veins with extremely high precious metal concentration (750-2250 ppm Ag). In course of the geological research we identified 68 adits and 4 shafts unknown earlier. There are thick breccia zones on the edge of the veins which are several meters thick primarily hydrothermal formations with Stockwerk type transition to the wall rock. Based upon the analyses of approximately 1500 samples it is proved that gold is concentrated in the veins while silver is mainly enriched in the eruptive breccias. We realized that the orebodies have a columnar structure along the strike of the veins. The following ore zone sequence was observed from the surface to the abyss: — Quartz, clayey and carbonate veins with the enrichment of gold and occurrence of silver. — Native gold bound to quartz veins. — Au, Ag complex sulphides bound to pyrite.