Arthashastra
सुवर्ण रजत वज्र मणि मुक्ता प्रवाल शङ्ख लोह लवण भूमि प्रस्तर रस धातवः खनिः ॥
Gold, silver, diamonds, gems, pearls, corals, conch-shells, metals (loha), salt, and other minerals extracted from plains and mountain slopes come under the head of mines.
english translation
suvarNa rajata vajra maNi muktA pravAla zaGkha loha lavaNa bhUmi prastara rasa dhAtavaH khaniH ॥
hk transliteration by Sanscript