Oxley died in 1828 and the property was passed on to his eldest son, John Norton Oxley. During John Norton's minority, Kirkham was managed by Captain Coghill, who had previously worked part of the farm. Coghill grew wheat and maize, which was processed on site in a mill erected in 1828. Farmers from the surrounding area, including the Macarthurs of Camden Park, used this mill. It was used until the 1860s, after which time wheat rust (a fungus) destroyed the wheat crops and production ceased. The mill was demolished in the 1880s.Weir Phillips, 2014, 6
