The ERA-MIN3 Newsletter- December 2021 is built on the celebration of the 10th anniversary of the ERA-MIN network, created in 2011. The newsletter contains an overview of the recently celebrated ERA-MIN 2 Final Conference and Final Seminar of Call 2017 projects and its Poster Competition, the link to the project testimonials of the joint transnational call 2017 funded projects, as well as the presentation of the "ERA-MIN: A decade since the inception of the EU led effort to support the international raw materials research community" poster, related to the 10th anniversary of the network. Related to ERA-MIN3, the full proposal results of the joint transnational call 2021 are summarized. A list of the most relevant News & Events where ERA-MIN has been a part of finalizes the newsletter.