An occurrence of PGM and Agtelluridesand Te-bearingelectrum in the Krzemianka Fe-Ti-V deposit (Suwa ki anorthosite massif, NE Poland)

Intensive studies of oxide Fe-Ti ores and accompanying them sulphides in Krzemiankarevealed an aggregate of PGM ores. Very small sizes of the grains have excluded routine optical measurements,essential in mineralogical identification. Chemical analyses in microareas have confirmedpreliminary identification of the following ore minerals: merenskyite (PdTe2), Pt-merenskyite (5.26% Pt),Ag-merenskyite (1.87% Ag), Au-merenskyite (8.13% Au), Te-bearing electrum (81.80% Au, 11.90% Ag,3.15% Te), hessite Ag2Te containing a Pd admixture (Pd-bearing hessite?), possibly stuetzite Ag5–xTe3.Tentatively identified phases include Se-bearing altaite Pb(Te,Se) orclausthalite PbSe, as well an Ag-Pd-Temineral: Ag-bearing empressite (Pd,Ag)Te, sopcheite Ag4Pd3Te4 or tellargpalite (Pd,Ag)4+xTe. Tellurides ofplatinum, palladium, gold and silver are epigenetic in relation to typical Fe-Ti ores and may represent anunusual, hydrothermal stage of ore precipitation.