The 1st international workshop organized by the InterRidge Working Group on Seafloor Massive Sulfides Resource along MOR is going to be held between 19 and 21 September 2019, in Hangzhou (China). The theme is “Hydrothermal ore-forming processes and the fate of SMS deposits along slow and ultraslow spreading MOR”. This workshop aims to understand several key scientific questions related to hydrothermal circulation mechanisms and the geological factors that contribute to the formation, distribution and preservation of SMS deposits along different spreading MOR. The Working Group hopes to capture the known/unknown BIG questions and identify future ways to address them through this workshop. More details on workshop's program and venue will be provided soon - stay tuned and do not hesitate to contact the organizers.