Mithril ore certificate

A Mithril ore certificate is a certificate that is obtained by exchanging five mithril ores with Giles at Draynor Village market. Mithril ore certificates are stackable and each one can be exchanged back for five mithril ores by talking to Giles.

Because mithril ores are not stackable and you can only trade twelve items per trade screen, they are often exchanged for certificates so that they can be traded easier and faster.