Joachim Piper renewed the mining privileges at Dannemora in 1532 and devoted substantial resources to the mine, mainly producing iron but also other minerals. the ownership structure changed in 1545, and a dozen wealthy individuals entered as the owners, so that a number of Germans and even King Gustav Vasa took part. The Germans were most interested in the export of pig iron but the king persuaded them to start production of wrought iron. It lasted only a few years and following a related bankruptcy, the king took over the operation fully.