Krótka charakterystyka ochry ze sztolni Marta (Nižná Slaná, Spiš-Gemer Ore Mts

Slavomir Hredzák; Marek Matik; Oľga Šestinová; Daniel Kupka; Zuzana Bártová; Lenka Hagarová; Anton Zubrik; Ingrid Znamenáčková; Silvia Dolinská

doi:10.29227/IM-2024-01-01

Slavomir Hredzák Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0001-6802-9684
Marek Matik Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0002-6204-8048
Oľga Šestinová Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0003-1684-7882
Daniel Kupka Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0001-5825-9507
Zuzana Bártová Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0001-9918-1224
Lenka Hagarová Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0001-6421-2676
Anton Zubrik Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0002-2176-0549
Ingrid Znamenáčková Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia
Silvia Dolinská Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, SK-04001 Košice, Slovakia https://orcid.org/0000-0003-4650-2922

DOI: https://doi.org/10.29227/IM-2024-01-01

Słowa kluczowe: Skład mineralogiczny, Ochra, Nižná Slaná, Słowacja

Abstrakt

The contribution deals with the study on composition of ochre sample from the Marta adit at Nižná Slaná. Three samples were prepared from ochre by hand picking and screening, which were subjected to GA, AAS, XRF and XRD. Salts precipitated on surface at drying contain 17.7 % S (53 % as SO4), 16.5 % MgO, 13.6 % Fe2O3, 3.54 % CaO and 1 % MnO. As to mineral composition, sulphates such as gypsum, starkeyite and rozenite are dominant. The fraction of grain size under 250 micron contains 30 % Fe2O3, 28.6 % SiO2, 8 % Al2O3, 6.6 % CaO, 2.9 % MgO and 1.95 % S. Notable is content of arsenic in this fraction, which attain as high as 1.84 %. Quartz and gypsum occur as dominant crystalline phases. As to coarser fraction, i.e. under 150 microns, 44.5 % SiO2, 16.8 % Fe2O3, 11.3 % Al2O3, 6.9 % CaO, 2.4 % MgO a 2.3 % C were assayed. Dominant quartz is accompanied by mica, plagioclase, ankerite and dolomite. It was shown that arsenic is bonded in finer grain size fraction.