This is the 10645th most frequent French word.
minier
"Minier" means "related to mining" in English.
Here, 'minier' is an adjective describing the site as related to mining.
Le site minier est fermé depuis des années.
The mining site has been closed for years.
In this context, 'minières' is used in its plural form as an adjective to describe industries related to mining.
Les industries minières sont essentielles pour l'économie.
The mining industries are essential for the economy.
Here, 'minière' is used as part of the noun phrase 'exploitation minière', indicating mining activities or operations.