The 12^th edition of the "Magmatism, Metamorphism, and Associated Mineralizations (3MA)" symposium will take place in Errachidia, Morocco. The organizing committee is delighted to once again bring together colleagues from various national and international universities to discuss scientific advancements in Earth sciences.

This symposium is one of the most important in its discipline in Morocco, if not the most important. It was regularly held biannually before the "COVID-19" era. The 3MA symposium will be held for the first time at the Faculty of Sciences and Techniques, Errachidia, and the 3^rd time at Moulay Ismail University, since it has been organized twice time in 1999 and 2017 by the Faculty of Sciences, Meknes.

Organizers are delighted and enjoyed organizing this post-pandemic 12^th edition. They also acknowledge the significant responsibility in ensuring the success of this scientific event, which has seen impressive growth and development in both content and impact.

By defining eight specific themes, the organizers aspire to generate interest among a large number of researchers and participants who will be warmly welcomed to Errachidia.

1. Petrology of Igneous and Metamorphic Rocks;
2. Geochemistry and geochronology;
3. Hydrothermal alterations and ore deposits;
4. Geomaterials and Industrial minerals;
5. Environmental impact and mine site rehabilitation;
6. Preservation of Geological and Mining Heritage
7. Exploration techniques: geophysics, remote sensing, mining modeling ;
8. Meteorites and Planetary Sciences