The Bogdanka coal mine, the only currently operating mine in the Lublin Coal Basin (LCB),
extracts coal from the Upper Carboniferous formations of the LCB. The average sulfur content in
the No. 385/2 seam is 0.98%, while in the case of the No. 391 seam it is slightly higher and amounts
to 1.15%. The iron sulfides (pyrite and marcasite) in bituminous coal seams form macroscopically
visible massive, vein, and dispersed forms. A microscopic examination has confirmed their complex
structure. Massive forms contain euhedral crystals and framboids. The sulfide aggregations are often
associated with a halo of dispersed veins and framboids. Pyrite and marcasite often fill the fusinite
cells. Framboids are highly variable when it comes to their size and the degree of compaction within
the carbonaceous matter. Their large aggregations form polyframboids. The cracks are often filled
with crystalline accumulations of iron sulfides (octaedric crystals). The Wavelenth Dispersive Spectrometry
(WDS) microanalysis allowed the chemical composition of sulfides in coal samples from the
examined depoists to be analyzed. It has been shown that they are dominated by iron sulfides FeS2 –
pyrite and marcasite. The examined sulfides contain small admixtures of Pb, Hg, Zn, Cu, Ag, Sb, Co,
Ni, As, and Cd. When it comes to the examined admixtures, the highest concentration of up to 0.24%,
is observed for As. In addition, small amounts of galena, siderite, and barite have also been found in
the examined coal samples. The amounts of the critical elements in the examined samples do not allow
for their economically justified exploitation. Higher concentrations of these elements can be found in
the ashes resulting from the combustion process.