The 1870 Mitchell colonial by-election was a by-election held on 8 February 1870 in the electoral district of Mitchell for the Queensland Legislative Assembly.
On 3 December 1869, Edward Lamb, member for Mitchell, resigned. Archibald Buchanan won the resulting by-election on 8 February 1870; however, it emerged he had not nominated as a candidate and had been elected against his own wishes, and he resigned two days later.[1][2]
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