Ōkubo Nagayasu

Ōkubo Nagayasu (died 1613) was the first intendant (bugyō) of the Iwami silver mine appointed by Tokugawa Ieyasu. After the Battle of Sekigahara, Ieyasu immediately seized the mine, and Nagayasu took charge of it as early as 1601. Whereas other fortresses in the region were abandoned, he had Yamabuki Castle, which overlooked the galleries, restored, and used the office established at its foot to administer the mine. The administrative centre was not transferred to Ōmori until after his time, during the Kan'ei era. His tomb lies in the mine's valley, which today forms part of the UNESCO World Heritage Site.