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| Archive Reference / Library Class No. | D1289/BL/412 |
| Title | Memorandum of agreement between Benjamin Tommison and his partners at their mine called Calver Sough and Houghton Pipe situated on the Ball Eye side in the liberty of Bonsall and Charles Kirkland and his partners at his mines called Founder Abbey and Ball Eye Mines, by which they have agreed to make a division line between their mines and titles where three |
| Date | 3 May 1822 |
| Description | Marks are made on the rocks from Blair Hole Founder Shift in the north-easterly direction |
| Extent | 1 item |
| Level | Item |
| Repository | Derbyshire Record Office |
| Archive Creator | Jim Rieuwerts (1935-2021), lead mining historian |