OPOLWAP S.A. (currently Lhoist)

Lime producer

Lubelski Węgiel "Bogdanka" S.A.

Coal mine

KKSM S.A.

Construction aggregates producer

KSS Złotoryja S.A.

Construction aggregates producer

KOSD Kielce S.A.

Construction aggregates producer

KWB Bełchatów S.A.

Lignite mines

Zakłady Przemysłu Wapieniczego "Trzuskawica" S.A.

Limestone products producer

KWB Turów S.A.

Lignite mines

KWB "Konin" w Kleczewie S.A.

Lignite mines