He putteth forth his hand - That is, the miner in securing the precious metals and gems.
Upon the rock - Margin, “flint.” The word used here (חלמישׁ challâmı̂ysh) occurs also in Psalms 104:8. Deuteronomy 8:15; Deuteronomy 32:13. It means “flint, silex;” and the idea is, that the miner approaches the hardest substances. He penetrates even the flint in searching for precious stones. Dr. Good renders it, “Sparry ore.” Michaelis renders the same word in Deuteronomy 7:15, porphyry, or red granite. The idea is that nothing, however difficult, not even cutting down the hardest rocks, deters the miner from pursuing his work.
He overturneth the mountains by the roots - That is, he digs under them, and they fall. The root of a mountain means its base or foundation. The following passage from Pliny (Hist. Nat. xxxiii. c. iv. 21) furnishes an admirable illustration of this passage: Tamen in silice facilior existimatur labor. Est namque terra ex quodam argillae genere glarae mixta, Candidam vocant, prope inexpugnabilis. Cuneis earn ferreis aggrediuntur, et iisdem mallets; nihilque durius putant, nisi quod inter omnia auri lama durissima est. Peracto opere cervices fornicum ab ultimo caedunt, dantque signun ruinrae, eamque solus intelligit in cacumine montis pervigil. Hic voce, ictuque, repente operarios revocari jubet, pariterque ipse devolat. Mons fractus cadit in scse Iongo fragore, qui concipi humana mente non possit, et flatu incredibili. Spectant victores ruinam naturae.