Inventory Reference GEO027 Formal Gradings Grading Grade IIIb Grading Date 20/10/2013 GradingComment Adit of local interest excavated in 1687 for silver but none was discovered. Grading by: DOUG COLE Statement of Significance Comprises a horizontal adit 20 metres long on the northern side of the Silvermine River Valley below Ou Kaapse Weg, but difficult to locate within thick vegetation. Silver was not found and the silver ore was probably mistaken for manganese ore. Significance criteria Significance Categories Historical Sphere of Significance Local Level Medium