location on the south bank of 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. All memory of its position was lost, until it was rediscovered in the 1880s by Valentine Ball, a geologist who helped to create this map of Golconda mines. 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. In the 1960s, Kollur Mine was pinpointed more accurately as being due north-east of Kollur village on the south bank of River Krishna at latitude 16° 43' N and longitude 80° 02' E, and extending for all the way up to Pulichinthala village. See also Golconda Diamonds Placer mining Notes References External links Diamond mines in India Geography of Guntur district Mining in Andhra Pradesh Former mines in India