in Guyana. The gravels of Mazaruni River and its tributaries are, as well, gold bearing. Some places, such as Imbaimadai, Kamarang, Aruwai, Tiboku, Kaburi and Marshal Falls produced a large amount of alluvial gold during golden era of river dredging (1980–1995). The river remains, to a lesser degree, a source of alluvial gold and diamonds. A few miles west of Bartica, there was an unsuccessful attempt to establish a hard-rock gold mine in 1888. See also South America References External links Rivers of Guyana Essequibo River