Inconfidência Mineira (Portuguese pronunciation: [ĩkõfiˈdẽsiɐ miˈnejɾɐ]; "Minas Gerais Conspiracy") was an unsuccessful Brazilian separatist movement in 1789. It was the result of a confluence of external and internal causes in what was then a Portuguese colony. The external inspiration was the independence of thirteen of the British colonies in North America following the American Revolutionary War, a development that impressed the intellectual elite of particularly the captaincy of Minas Gerais. The main internal cause of the conspiracy was the decline of gold mining in that captaincy. As gold became less plentiful, the region's gold miners faced increasing difficulties in fulfilling tax obligations to the crown. When the captaincy could not satisfy the royal demand for gold, it was burdened with an additional tax on gold, called derrama.
Conspirators seeking independence from Portugal planned to rise up in rebellion on the day that the derrama was instituted. However, the conspirators lacked both well-formed plans and an overall leader. Some of the conspirators were republicans, others were monarchists. Some favored the abolition of slavery, while others judged abolition as impractical at that time. The conspirators did put forth a few economic and social ideas: the promotion of cotton production, the exploitation of iron and saltpeter reserves, a proposal to give incentives to mothers to have many children, and the creation of a citizens' militia.