The local Mesozoic brown Coal is composed by Lignite of Lower Jurassic age, known as the Blanowice Coal.
Increased carbon-bearing capacity, locally present in the profile of the Upper Forest land sediments, was the basis for the development coal mining in this area in the years 1818–1959.
The mining center at that time was concentrated in the vicinity of Poręba near Zawiercie, as well as in a dozen other towns (Sprawowice, Blanowice, Łazy, Siewierz).
Its basis was shallow exploitation a coal seam with a thickness of up to 2.0 m.
Occurrence of Blanowice Coals in Jurassic outcrops between Częstochowa and Zawiercie was known for a long time.
Already in the 1890s, they were mined on a small scale in the vicinity of Blanowice, being described since the start of the exploitation.
After 1796 on Siewiersk was reported hard coal, the first outcrop of the main Blanowice Fm coal.
The mining of Blanowice Coals developed specially in the 1920s and 30s of the 20th century, where major discoveries where reported.
This coals where exploited on small exploitations, where various minor mines recovered the coal seams.
 The "Zygmunt" mine, operating at the turn of the 1920s and 1930s, was one of the largest.
Annual production, as shown in official documents, it exceeded the total output from other mines many times.
The local Mesozoic brown Coal is composed by Lignite of Lower Jurassic age, known as the Blanowice Coal. Increased carbon-bearing capacity, locally present in the profile of the Upper Forest land sediments, was the basis for the development coal mining in this area in the years 1818–1959. The mining center at that time was concentrated in the vicinity of Poręba near Zawiercie, as well as in a dozen other towns (Sprawowice, Blanowice, Łazy, Siewierz). Its basis was shallow exploitation a coal seam with a thickness of up to 2.0 m.
Occurrence of Blanowice Coals in Jurassic outcrops between Częstochowa and Zawiercie was known for a long time. Already in the 1890s, they were mined on a small scale in the vicinity of Blanowice, being described since the start of the exploitation. After 1796 on Siewiersk was reported hard coal, the first outcrop of the main Blanowice Fm coal. The mining of Blanowice Coals developed specially in the 1920s and 30s of the 20th century, where major discoveries where reported. This coals where exploited on small exploitations, where various minor mines recovered the coal seams.  The "Zygmunt" mine, operating at the turn of the 1920s and 1930s, was one of the largest. Annual production, as shown in official documents, it exceeded the total output from other mines many times.
Blanowice Formation