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Oya mine, Motoyoshi, Kesennuma City, Miyagi Prefecture, Japani
Regional Level Types
Oya mineMine
MotoyoshiDistrict
Kesennuma CityCity
Miyagi PrefecturePrefecture
JapanCountry

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Key
Latitude & Longitude (WGS84):
38° 52' 0'' North , 141° 31' 20'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Ōfunato35,418 (2017)28.3km
Ichinoseki62,970 (2017)34.1km
Mizusawa61,281 (2017)44.8km
Wakuya18,334 (2017)49.1km
Name(s) in local language(s):
大谷(おおや)鉱山, 宮城県 気仙沼市 本吉町


A gold and silver mine, started in 1915 and closed in 1971 (1958 production: 362 Kg Au, at average grade 7.4g/t; 107 Kg Ag, 2g/t).
Gold mine, started before at least 1928.

Histrical summary:
Before 1928: already run by hand digging.
1934: floating beneficiation plant was started.
1943: temporaly halt due to aggravation of WWII (see notice).
1950: restarted.
1962: owner changed from Nihon-kogyo (now, JX Nippon Mining & Metal) to Oya Mine Co., Ltd.
1972: mining activity was closed, only beneficiation plant continued.
1976: All facilities were closed.

Notice:
In war situation, gold is one of strategic material (for importing resources).
So, when WWII started, the government at that time encouraged the development of a gold mine.
But in 1943, the gold mines of were suspended by the regulations because it was difficult to secure the resources by import.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


10 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
Arsenopyrite
Formula: FeAsS
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
Chalcopyrite
Formula: CuFeS2
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
Galena
Formula: PbS
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
Gold
Formula: Au
Reference: Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960); Cristiana L. Ciobanu, John Mavrogenes, Nigel J. Cook and Masaaki Shimizu (2007) Au-Bi-Te melts: Annealing-quenching experiments on material from the Oya gold deposit (Japan). Geologian tutkimuskeskus, Opas 53 – Geological Survey of Finland, Guide 53, pp 15-22; "宮城県大谷鉱山北部の地質鉱床", Bulletin of the Geological Survey of Japan Vol.11, No.9
Pyrite
Formula: FeS2
Reference: Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960); Cristiana L. Ciobanu, John Mavrogenes, Nigel J. Cook and Masaaki Shimizu (2007) Au-Bi-Te melts: Annealing-quenching experiments on material from the Oya gold deposit (Japan). Geologian tutkimuskeskus, Opas 53 – Geological Survey of Finland, Guide 53, pp 15-22
Pyrrhotite
Formula: Fe7S8
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.; Cristiana L. Ciobanu, John Mavrogenes, Nigel J. Cook and Masaaki Shimizu (2007) Au-Bi-Te melts: Annealing-quenching experiments on material from the Oya gold deposit (Japan). Geologian tutkimuskeskus, Opas 53 – Geological Survey of Finland, Guide 53, pp 15-22
Quartz
Formula: SiO2
Reference: Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960); Cristiana L. Ciobanu, John Mavrogenes, Nigel J. Cook and Masaaki Shimizu (2007) Au-Bi-Te melts: Annealing-quenching experiments on material from the Oya gold deposit (Japan). Geologian tutkimuskeskus, Opas 53 – Geological Survey of Finland, Guide 53, pp 15-22
Sphalerite
Formula: ZnS
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
Tellurobismuthite
Formula: Bi2Te3
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Cristiana L. Ciobanu, John Mavrogenes, Nigel J. Cook and Masaaki Shimizu (2007) Au-Bi-Te melts: Annealing-quenching experiments on material from the Oya gold deposit (Japan). Geologian tutkimuskeskus, Opas 53 – Geological Survey of Finland, Guide 53, pp 15-22

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Arsenopyrite2.EB.20FeAsS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Tellurobismuthite2.DC.05Bi2Te3
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 2:3
Tellurobismuthite2.11.7.2Bi2Te3
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.

Other Regions, Features and Areas containing this locality

AsiaContinent
Japan
Okhotsk PlateTectonic Plate

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