He retired from the mines where he had risen to Sectional Shift boss, in 1995 and relocated to his home village in Samfya to concentrate on farming.
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When his father retired from the mine in Kitwe, the family moved to Mufulira in 1959 and the following year, Mwansa joined Mufulira Mine Team whose name changed to Mufulira Wanderers in 1962 when the Zambian National Football League (NFL) was formed.
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He kept goal for the dominant Wanderers side of the ‘60s and played alongside players like Samuel ‘Zoom’ Ndhlovu, Penius ‘Kapenta’ Chirwa, Joseph ‘Kanono’ Musonda, Dickson ‘Barb-Wire’ Makwaza, George ‘Wikolo’ Sikazwe, Patrick ‘Whiskey’ Nkole, Ken Simwanza, Bedford ‘Mayo,’ Kaputo, Willie ‘Orlando’ Kunda and Elijah ‘Kapilipili’ Mwale.
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He made a return when Zambia met Cameroon for a place at CAN 1970 with Zambia drawing 2-2 at home in June 1969 and going out after a 2-1 defeat in Yaoundé on 3 August 1969 in a match where Zambia scored first through Godfrey Chitalu and conceded an equalizer by Confiance Moukoko in the 56th minute.