User blog comment:D2r/Unanswered Questions of Redwall/@comment-3518397-20110411191411/@comment-1669318-20110422164556

There was a mine mentioned in the first book, and they really wouldn't need that much metal either. They probably just reforge old metal objects into what they need. It's not as if they're throwing stuff away. And Redwall does have a small forge in the cellar, as is stated in Rakkety Tam and implied in Ledgend of Luke.