He resigned on Tuesday after being implicated in an adultery scandal that he says was fabricated by the regime.
The 60 year old Ncube said his resignation was intended to save the church from further attacks. It would also enable him to challenge the adultery charge in court in his private capacity.
He said: "I remain a Catholic bishop in Zimbabwe and will continue to speak out on the issues that sadly become more acute by the day."
He said he would look in coming weeks at "various options" open to him within the church and civic groups.
He said in Zimbabwe people were suffering more each day. "I will use my experiences working among the people to lobby for greater humanitarian support, in particular for food and medical supplies at this time of extreme national crisis."
He said he was stepping down "in order to spare my fellow bishops and the board of the church any further attacks."
Ncube's full resignation statement (Zimbabwe Journalists, 12/9/07)
Anti-Mugabe archbishop resigns, attacking 'wicked' regime (Anatolian Times, 12/9/07)
LINKS (not necessarily endorsed by Church Resources)
Robert Mugabe (Wikipedia)
Pius Ncube (Wikipedia)
Ncube to resign, reports anticipate (CathNews, 10/9/07)
Zimbabwe paper threatens to break more Ncube allegations (CathNews, 21/8/07)
Christians, activists in Ncube support block (CathNews, 25/7/07)
Ncube says adultery claims "politically motivated" (CathNews, 18/7/07)
OK to invade and remove Mugabe, Ncube tells Brits (CathNews, 2/7/07)
Green Bomber militias threaten Zimbabwe Catholics: Ncube (CathNews, 1/6/07)
Bishops back Zimbabwe cricket boycott (CathNews, 11/5/07)