Field and hand sample photographs of the Echassières complex. (a) Kaolinized apical zone of the Beauvoir rare-metal granite and its mica schist host (Beauvoir open pit; WGS84 coordinates: 2.9563, 46.1767). (b) La Bosse stockwork with quartz-wolframite veins and aplitic dyke crosscutting the mica schists above the Beauvoir granite (2.9549, 46.1756). (c) Raft of quartz-wolframite-cassiterite vein (LMON-004) within an aplitic dyke of the La Bosse stockwork. (d) GPF drill core of Sioule series mica schist with quartz ± feldspar lenses parallel to the foliation, crosscut by a slightly folded quartz-muscovite-apatite-wolframite vein (92.04 m). (e) Colettes K-feldspar porphyritic muscovite-zinnwaldite-cordierite granite (ECH22-02) as well as microgranitic and rhyolitic sub-equivalents. The zinnwaldite-muscovite porphyritic microgranite occurs as enclave in the B2 unit of the Beauvoir granite (GPF drill core - 700m). The devitrified porphyritic rhyolite (ECH22-05) occurs as partially silicified dyke to the south of the Echassières complex. It hosts clusters of muscovite likely representing pseudomorphs after cordierite (See Fig. S3h). (f) GPF drill core of the B1 (132.85 m), B2 (642.8 m) and B3 (874.3 m) units of the Beauvoir RMG, illustrating disseminated cassiterite, magmatic layering and the crosscutting relationship between the B3 Beauvoir granite unit and quartz-wolframite vein in the mica schist. Mineral abbreviation from Warr (2021). Other abbreviation: S - foliation, Wolf - wolframite.