Kollur Mine was a series of gravel-clay pits on the south bank of the Krishna River in the state of Andhra Pradesh, India.
The pit walls had no timber supports and caved in after heavy rains, killing dozens of men at a time (women and children worked above ground).
[12] Other diamonds thought to have originated at Kollur include the Koh-i-Noor,[1] the Great Mogul,[13] the Wittelsbach-Graff,[14] the Regent, the Daria-i-Noor, the Orlov, the Nizam, the Dresden Green, and the Nassak.
[citation needed] Kollur Mine's location on the south bank of the Krishna River is indicated at latitude 16° 42' 30" N and longitude 80° 5' E on several maps created in the 17th and 18th centuries.
[16] In his annotated English edition of gem merchant Jean-Baptiste Tavernier's book Travels in India (1676), Ball notes that ruins of houses and mine workings could still be found at Kollur.