This is the 7009th most frequent Polish word.
górnicza
"Górnicza" means "mining" or "pertaining to miners" (feminine form).
This usage of the word 'górniczej' refers to its adjectival form describing something related to miners or mining.
Pracowała na górniczej kopalni przez dziesięć lat.
She worked at a mining mine for ten years.
Here, 'Górnicza' serves as the feminine adjective for mining, describing the nature of the work.
Górnicza praca jest bardzo wymagająca i niebezpieczna.
Mining work is very demanding and dangerous.
In this sentence, 'Górnicza' is part of a proper noun, naming a street, and relates to the mining profession, possibly where miners or mining activities were historically significant.