Charles Ellicott Commentary Job 28:6

"The stones thereof are the place of sapphires, And it hath dust of gold." — Job 28:6 (ASV)

The stones of it are the place of sapphires. —So ingenious is man that he discovers a place of which the stones are sapphires and the very dust gold, and a path that no bird of prey knows, and which the falcon’s eye has not seen.