were officials of the Tokugawa shogunate

Tokugawa shogunate

The Tokugawa shogunate, also known as the and the , was a feudal regime of Japan established by Tokugawa Ieyasu and ruled by the shoguns of the Tokugawa family. This period is known as the Edo period and gets its name from the capital city, Edo, which is now called Tokyo, after the name was...

. This commissioner was responsible for administration of the mining operations at Sado

Sado, Niigata

is a city located on Sado Island in Niigata Prefecture, in the Chūbu region of Japan. Since 2004, the city has comprised the entire island, although not all of its total area of 855.26 km2 is urbanized...

.

Appointments to this prominent office were usually fudai

Fudai

was a class of daimyo who were hereditary vassals of the Tokugawa in Edo period Japan. It was primarily the fudai who filled the ranks of the Tokugawa administration.-Origins:...

daimyō

Daimyo

is a generic term referring to the powerful territorial lords in pre-modern Japan who ruled most of the country from their vast, hereditary land holdings...

, but this was amongst the senior administrative posts open to those who were not daimyō. Conventional interpretations have construed these Japanese titles as "commissioner" or "overseer" or "governor."

Sado island is the sixth largest in the Japanese archipelago. It is located in the Sea of Japan

Sea of Japan

The Sea of Japan is a marginal sea of the western Pacific Ocean, between the Asian mainland, the Japanese archipelago and Sakhalin. It is bordered by Japan, North Korea, Russia and South Korea. Like the Mediterranean Sea, it has almost no tides due to its nearly complete enclosure from the Pacific...

 off the west coast of Echigo province

Echigo Province

was an old province in north-central Japan, on the shores of the Sea of Japan. It was sometimes called , with Echizen and Etchū Provinces. Today the area is part of Niigata Prefecture, which also includes the island which was the old Sado Province. This province was the northernmost part of the...

 in northwest Honshu

Honshu

is the largest island of Japan. The nation's main island, it is south of Hokkaido across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyushu across the Kanmon Strait...

. For much of its pre-modern history, exiles were banished to the island.

The gold mine

In 1601, gold was discovered at This vein was mined vigorously; and Sado's gold mine developed into a major source of revenue for the Tokugawa shogunate, producing approximately 100 tons of ore annually until the mid-18th century.