Potosi in Trelawny, Jamaica was named after the fabled Bolivian silver mine and originally belonged to Thomas Partridge of St. James (This was before the Parish of Trelawny came into existence). His son, also Thomas, inherited the property and on his death ownership passed to his two sisters, including Elizabeth. Elizabeth married John Tharp some time in 1766 and, on 31 Dec 1766, Articles of Agreement were signed "granting to John Tharp, husband of Elizabeth joint devisee with her sister under Will of Thomas Partridge her brother to Potosi and Flamstead Estates, management of same until said devisees are both of age (See Tharp Papers)
This was the start of Tharp's collection of properties on the Martha Brae river.

I believe the Works belong to the Muschett family (of Wales) and the Great House ruins, together with both banks of the river, belong to Mr Parkin (who also owns part of Retreat). All are in ruined condition with just walls remaining. One special feature of this factory is the cut-stone chute which used to carry the cane from the hillside down to the valley floor.