Inventory Reference GEO028 Formal Gradings Grading Grade IIIb Grading Date 17/10/2013 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 15 metres long on the southern side of the Silvermine Valley 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