In 1918, the Soviet government relocated from Petrograd to Moscow. Subsequently, some of the Mining Museum’s most valuable objects were transferred to the Diamond Fund, which did not, however, stop the natural-scientific repository from replenishing its collections. By early 1941, the Museum had accumulated 130,014 exhibits, of which 25,540 were on display - samples of minerals, rocks and fossils, models and prototypes of mining and metallurgical equipment. The Mining Museum was highly popular at the time, by no means inferior to the Hermitage or Tsarskoye Selo.