Koltan

Coltan (Turanci: Coltan, cikakken suna: columbite-tantalite kuma an san shi a masana'antu a matsayin tantalite) ƙarfe ne mai ƙarancin ƙarfe wanda aka cire abubuwa niobium da tantalum. Ma'adinin niobium mai rinjaye a cikin coltan shine columbite (bayan asalin sunan niobium na Amurka), kuma ma'adinin tantalum mai rinjaye shine tantalite.Tantalum-Niobium International Study Centre, Coltan, archived from the original on 14 January 2016, retrieved 27 January 2008

Ana amfani da Tantalum daga coltan don ƙera capacitors na tantalum waɗanda ake amfani da su don wayoyin hannu, kwamfutocin mutum, kayan lantarki na mota, da kyamarori. Ma'adinai na Coltan Congo: war-torn heart of Africa, 1 December 2008, archived from the original on 25 August 2013, retrieved 18 October 2012ya yadu a Jamhuriyar Demokradiyyar Kongo.Breaking the Silence- Congo Week, 15 December 2009, archived from the original on 25 July 2011, retrieved 11 October 2011.

Kimanin kashi 71% na wadatar tantalum ta duniya a cikin 2008 an haƙa shi, kashi 20% daga sake amfani ne, kuma ragowar ta fito ne daga tarkace da kaya. Ana hakar ma'adanai na Tantalum a Jamhuriyar Demokradiyyar Kongo, Colombia, Rwanda, Australia, Brazil, China, Habasha, Mozambique da Kenya.  Hakanan ana samar da Tantalum a Thailand da Malaysia a matsayin samfur na hakar ma'adinai da narkewa. Ana bincika ma'adanai masu yuwuwa a nan gaba, a cikin tsari mai saukowa, a Misira, Greenland, China, Australia, Finland, Kanada, Najeriya da Brazil

A duniya, kashi 60% na dukkan kamfanonin hakar ma'adinai sun yi rajista tare da musayar hannun jari mai tsari sosai a kasar  Toronto da Vancouver. Koyaya, saboda ka'idojin muhalli, babu hakar ma'adinai na coltan a halin yanzu da ke faruwa a Kasar Kanada kanta,  ban da ma'adinin da aka tsara a Blue River, British Columbia. A Kasar Kanada, Tanco Mine kusa da Bernic Lake a Manitoba yana da tanadin tantalum, shine mafi girma a duniya mai samar da Caesium, kuma Global Advanced Metals Pty Ltd ne ke sarrafa shi. Tattaunawar ma'adinai ta Kanada ta Natural Resources Canada, wanda aka sabunta a cikin 2017, bai ambaci  coltan ba."IRC Study Shows Congo's Neglected Crisis Leaves 5.4 Million Dead; Peace Deal in N. Kivu, Increased Aid Critical to Reducing Death Toll". 22 January 2008. Retrieved 17 April 2011.

 Manazarta