Mapy obszarów perspektywicznych wystąpień rud metali w Polsce w skali 1 : 200 000 – rudy złota typu żyłowego i metasomatycznego towarzyszące mineralizacji siarczkowej na Dolnym i Górnym Śląsku oraz w Małopolsce (południowa Polska)

Stanisław Z. Mikulski

Abstrakt


The prospective maps of metal ores in Poland at scale 1 : 200 000 – gold vein and metasomatic ores associated with sulfide mineralization in the Lower Silesia, Upper Silesia and Małopolska (S Poland).
A b s t r a c t. Seven prospective areas have been delineated for gold deposits of vein and metasomatic types in the Sudetes (Kłodzko–Złoty Stok, Southern Kaczawa Mountains and Rudawy Janowickie prospective areas), on the Fore-Sudetic Block (Wądroże Wielkie) and in the contact zone of the Małopolska Block with the Upper Silesia Block (Dolina Będkowska, Pilica and Mysłów prospective areas). In total they are covering ca. 285.5 km2, (ca.252 km2 in the Sudetes and ca. 22 km2 on the Fore-Sudetic Block). The prospective areas were recognized on the basis of current regulations, which defined marginal parameters of specific deposit and delineated its borders together with application of adequate quantitative Au deposit models supported by ore parameters from the old mining records. Total predicted/estimated gold resources (prognostic + prospective resources),which are depending on the applied parameters, are from ca. 9.4 Mg (for n = 16 ore bodies) to 21.5 Mg (for n = 64 o.b.). The auriferous ores of the vein and metasomatic types (blind bodies) are associated with the metamorphosed volcanic-sedimentary Paleozoic formation in Lower Silesia and with contact-metasomatic zones around Variscan granitoid intrusions in southern Poland. The greatest estimated Au resources were recognized in the following areas: Kłodzko–Złoty Stok – ca. 6.3 Mg Au (for n = 7 o.b. – skarns, veins and beresites), Southern Kaczawa Mountains – ca. 4.8 Mg Au (for n
= 15 o.b.) and Rudawy Janowickie – ca. 4.5 Mg Au (for n = 20 o.b. of vein and/or skarn types). In the contact zone of the Małopolska Block with the Upper Silesia Block the prospective areas are associated with the marginal zones (epithermal Au veins) around the granitoid/porphyry-related mineralization of the Mo-Cu-W type. The limited ore prospecting causes difficulties in estimation of Au resources in that area. The available data has allowed for a rough estimation of Au resources from ca. 1 to 3.5 Mg (for n = 5–21 o.b.).
In most of the recognized Au prospective areas, auriferous mineralization is in paragenetic association with refractory gold sulfides and only sporadically appears as native gold or electrum mineralization (mainly in quartz veins). A new stage of gold prospection is highly recommended especially within the abandoned gold mining areas in the Sudetes. An application of modern geophysics (VLF and IP) followed by shallow drillings should bring new discoveries of gold deposits. In the report, environmental and spatial conflicts have also been pointed out within the specific gold prospective areas in relation to the presence of National Parks, NATURE 2000 areas, underground water reservoirs, etc.

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