This is the 13863rd most frequent Turkish word.
madenlerin
"Of the mines" or "of the minerals" (possessive/genitive form of "madenler").
Here, 'madenlerin' refers to 'minerals' and is used in the possessive case to describe the richness related to Turkey.
Türkiye madenlerin zengin olduğu bir ülkedir.
Turkey is a country rich in minerals.
Here, 'madenlerin' again references 'minerals' and is in the possessive case showing the objects being processed.
Madenlerin işlenmesi, modern teknoloji gerektirir.
Processing minerals requires modern technology.
In this sentence, 'madenlerin' refers to 'the mines' and illustrates possession, indicating aspects of the mines being studied.