The chronology

1889
Mitsui-Gumi obtained the mining concession for all of Kamioka Mine

1896
Newspaper reported agricultural damage in the Jinzugawa River basin

1910's-
1930's
Outbreak of Itai-itai Disease
The agricultural and fishery organizations in the Jinzugawa River basin complained of the mineral poison damage from Kamioka Mine The prefecture granted subsidies for precipitation pools at rice fields’irrigation inlets

1955
August
"The Itai-itai Disease" reported in newspapers for the first time
October
The first conference presentation where the name "Itai-itai Disease" was used (The 17th Japan Surgical Association Conference)

1956
February
The theory that the cause is malnutrition and hard labor published (The Clinical Nutrition, No.2, Vol.9)

1957
December
The theory that the cause is mineral poison published (The 12th Toyama Prefecture medical convention)

1961
June
The theory that the cause is cadmium published (The 34th Conference of Japanese Orthopedic Association)
December
Toyama Prefecture Study Committee on local special diseases established

1966
November
Council of Countermeasures for Itai-itai Disease established
1967
June
The Ministry of Health & Welfare commissioned the research to the Itai-itai Disease research team of Japan Public Health Association
The Council of Countermeasures for Itai-itai Disease started negotiation with Kamioka Mine about reparation
July
The prefecture began research on the actual health conditions of residents in the Jinzugawa River basin
December
Three victims of Itai-itai Disease petitioned the Ministers of Health & Welfare and of International Trade & Industry for relief aid
The prefecture, on its own accord, certified the first Itai-itai Disease victim

1968
January
The lawyers’ group was organized for the Itai-itai Disease lawsuit
March
The first suit requesting compensation by Mitsui Mining & Smelting Company to the victims was filed
From then until July 1971, seven lawsuits (182 cases) were filed
May
The opinion of Ministry of Health & Welfare was published (Itai-itai Disease recognized as caused by pollution)

1970
February
The Jinzugawa River basin area was designated under a special measures law, concerning the relief of health damage caused by pollution
Since then, relief of the Itai-itai Disease victims are being carried out according to the law
The court made decision to allow cost deferment for trial

1971
June
At the first trial, the victims won the case, and Mitsui Mining & Smelting Company appealed

1972
August
At the second trial, the victims won the case completely
Between the victims and Mitsui Mining & Smelting Company, three documents were signed: promissory letter for compensation to the victims of Itai-itai Disease, pledge for restoration of polluted land, and agreement for prevention of public hazard
November
Based on the agreement for prevention of public hazard, the first on-site inspection was conducted (200 residents, 26 experts such as scientists)

1977
November
Designation of 1500.6 hectares of polluted farming land needing restoration measures was completed

1978
February
The first specialty on-site inspection conducted

1979
March
Pollution caused by leakage from the waterway found at on-site inspection
April
The health examination of the residents conducted as a commissioned project by the Environmental Agency (presently Ministry of the Environment)

1980
February
Work began on the polluted farming land restoration (area 1). Through 1992, work is planned and started up through area 3

1987
August
The disposal method of the slag left from extracting zinc from Kamioka Mine was changed from dry-method to wet-method
For the first time, an area of polluted farming land needing restoration measure was delisted
Since then, areas continue to be delisted

1997
February
Restoration measures planned in the area of restricted rice distribution

2001
June
Mining of zinc and lead minerals at Kamioka Mine ended

2009
June
Prefecture established the Investigative Commission for Succession of Itai-itai Disease Related Materials

2010
February
The Investigative Commission for Succession of Itai-itai Disease Related Materials submitted the report to the prefecture containing the idea of establishing a museum
March
Prefecture decided on a fundamental plan for creating the Itai-itai Disease Museum

2011
June
Began construction work of Toyama Prefectural Itai-itai Disease Museum

2012
March
Completion of restoring the lands in the designated areas
April
Toyama Prefectural Itai-itai Disease Museum was opened

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