1894 Brewer’s / B / Black Jack
Black Jack rides a good horse (Cornish). The miners call blende or sulphide of zinc “Black Jack,” the occurrence of which is considered by them a favourable indication. The blende rides upon a lode of good ore.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.