Farm tin or the tin dues was one of a number of payments required of tin miners in Devon and Cornwall.
The holder of a mining sett was required to pay a portion of the black tin extracted to the holder of the tin bounds in which the sett was granted.
The portion was the "farm tin".
[1] The portion was normally interpreted to be one-twelfth of extracted tin: they were also required to play toll tin, calculated at one fifteenth.
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