en_tn_condensed/job/28/09.md

lays his hand on the flinty rock

This represents breaking up the rock. Alternate translation: "digs into the flinty rock" (See: rc://en/ta/man/translate/figs-metonymy)

flinty rock

"hard rock"

he overturns mountains by their roots

Digging up the mountains and the ground underneath them is a metaphor from digging out weeds or trees, an exaggeration that represents digging minerals out of the ground. Alternate translation: "he turns the mountains upside down by pulling out their roots" (See: rc://en/ta/man/translate/figs-hyperbole and rc://en/ta/man/translate/figs-metaphor)