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Toi mine, Izu City, Shizuoka Prefecture, Japan i
Regional Level Types
Toi mine Mine (Tourist Attraction)
Izu City City
Shizuoka Prefecture Prefecture
Japan Country

Regional Level Types
Toi mine	Mine (Tourist Attraction)
Izu City	City
Shizuoka Prefecture	Prefecture
Japan	Country

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Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Wairakite

Toi mine, Izu City, Shizuoka Prefecture, Japan

Latitude & Longitude (WGS84):

34° 54' 30'' North , 138° 47' 34'' East

Latitude & Longitude (decimal):

34.90833,138.79278

GRN:

N24E81

Type:

Mine (Tourist Attraction) - last checked 2024

Köppen climate type:

Cfa : Humid subtropical climate

Nearest Settlements:

Place	Population	Distance
Heda	3,681 (2017)	6.1km
Numazu	204,318 (2017)	22.3km
Mishima	113,479 (2017)	25.8km
Itō	71,578 (2017)	27.3km
Shimoda	26,704 (2017)	29.3km

Mindat Locality ID:

29854

Long-form identifier:

mindat:1:2:29854:7

GUID (UUID V4):

A gold and silver mine started in 1925 and closed in 1965. The mine was ultimately closed in 1965 and then reopened for tourism.

It worked the low-temperature veins in altered volcanic rocks. Mining was made difficult by underground hot springs. In 1958, production was 185 kg of Au and 1,283 kg of Ag, from ore averaging 10.0 g/t Au and 69 g/t Ag. (Ref: Geological Survey of Japan, 1960).

Toi was the second most productive gold mine in Japan, after the gold mine of Sado in Niigata Prefecture.

Small-scale gold mining is said to have started at Toi around 1370.

Note on the mineral list: Yugawaralite, alleged to be from this mine, is actually from the country rock nearby and not from the mine itself.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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

ⓘ Gold

ⓘ Silver

Mineral List

12 valid minerals.

Detailed Mineral List:

ⓘ Acanthite

Formula: Ag₂S

References:

Shikazono, Naotatsu (1985) A comparison of temperatures estimated from the electrum-sphalerite-pyrite-argentite assemblage and filling temperatures of fluid inclusions from epithermal Au-Ag vein-type deposits in Japan. Economic Geology, 80 (5) 1415-1424 doi:10.2113/gsecongeo.80.5.1415

Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo

ⓘ Galena

Formula: PbS

References:

Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo

ⓘ Native Gold

Formula: Au

References:

Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., Watanabe, Y. (2007) Mineral Resources Map of East Asia, Geological Survey of Japan.

ⓘ Native Gold var. Electrum

Formula: (Au,Ag)

References:

Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo

ⓘ Pyrargyrite

Formula: Ag₃SbS₃

References:

Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., Watanabe, Y. (2007) Mineral Resources Map of East Asia, Geological Survey of Japan.

ⓘ Pyrite

Formula: FeS₂

References:

ⓘ Quartz

Formula: SiO₂

References:

Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo

ⓘ Sphalerite

Formula: ZnS

References:

Makoto Watanabe (1983) Journal of Science of the Hiroshima University, Series C, 8, #1, 67-94.

Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo

ⓘ Stephanite

Formula: Ag₅SbS₄

References:

Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., Watanabe, Y. (2007) Mineral Resources Map of East Asia, Geological Survey of Japan.

ⓘ Truscottite

Formula: (Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O

References:

Chalmers, R. A., Farmer, V. C., Harker, R. I., Kelly, S., Taylor, H. F. W. (1964) Reyerite. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (265) 821-840 doi:10.1180/minmag.1964.033.265.01

ⓘ Wairakite

Formula: Ca(Al₂Si₄O₁₂) · 2H₂O

References:

(n.d.) Knut Eldjarn collection.

ⓘ Yugawaralite

Formula: CaAl₂Si₆O₁₆ · 4H₂O

Description: Discovered by Nozomi Sasaki in a roadcut in the country rock near the mine, not in the mine itself.

References:

Nozomi Sasaki discovery and specimensIdentification: Dealer/Collection Label

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Gold var. Electrum	1.AA.05	(Au,Ag)
ⓘ		1.AA.05	Au
Group 2 - Sulphides and Sulfosalts
ⓘ	Acanthite	2.BA.35	Ag₂S
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Galena	2.CD.10	PbS
ⓘ	Pyrite	2.EB.05a	FeS₂
ⓘ	Pyrargyrite	2.GA.05	Ag₃SbS₃
ⓘ	Stephanite	2.GB.10	Ag₅SbS₄
Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂
Group 9 - Silicates
ⓘ	Truscottite	9.EE.35	(Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O
ⓘ	Wairakite	9.GB.05	Ca(Al₂Si₄O₁₂) · 2H₂O
ⓘ	Yugawaralite	9.GB.15	CaAl₂Si₆O₁₆ · 4H₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Truscottite	(Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O
H	ⓘ Wairakite	Ca(Al₂Si₄O₁₂) · 2H₂O
H	ⓘ Yugawaralite	CaAl₂Si₆O₁₆ · 4H₂O
O	Oxygen
O	ⓘ Quartz	SiO₂
O	ⓘ Truscottite	(Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O
O	ⓘ Wairakite	Ca(Al₂Si₄O₁₂) · 2H₂O
O	ⓘ Yugawaralite	CaAl₂Si₆O₁₆ · 4H₂O
Al	Aluminium
Al	ⓘ Wairakite	Ca(Al₂Si₄O₁₂) · 2H₂O
Al	ⓘ Yugawaralite	CaAl₂Si₆O₁₆ · 4H₂O
Si	Silicon
Si	ⓘ Quartz	SiO₂
Si	ⓘ Truscottite	(Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O
Si	ⓘ Wairakite	Ca(Al₂Si₄O₁₂) · 2H₂O
Si	ⓘ Yugawaralite	CaAl₂Si₆O₁₆ · 4H₂O
S	Sulfur
S	ⓘ Acanthite	Ag₂S
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Galena	PbS
S	ⓘ Pyrargyrite	Ag₃SbS₃
S	ⓘ Pyrite	FeS₂
S	ⓘ Sphalerite	ZnS
S	ⓘ Stephanite	Ag₅SbS₄
Ca	Calcium
Ca	ⓘ Truscottite	(Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O
Ca	ⓘ Wairakite	Ca(Al₂Si₄O₁₂) · 2H₂O
Ca	ⓘ Yugawaralite	CaAl₂Si₆O₁₆ · 4H₂O
Mn	Manganese
Mn	ⓘ Truscottite	(Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O
Fe	Iron
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Pyrite	FeS₂
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
Ag	Silver
Ag	ⓘ Acanthite	Ag₂S
Ag	ⓘ Native Gold var. Electrum	(Au,Ag)
Ag	ⓘ Pyrargyrite	Ag₃SbS₃
Ag	ⓘ Stephanite	Ag₅SbS₄
Sb	Antimony
Sb	ⓘ Pyrargyrite	Ag₃SbS₃
Sb	ⓘ Stephanite	Ag₅SbS₄
Au	Gold
Au	ⓘ Native Gold var. Electrum	(Au,Ag)
Au	ⓘ Native Gold	Au
Pb	Lead
Pb	ⓘ Galena	PbS

Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Toi_gold_mine
Wikidata ID:	Q3314832

Other Regions, Features and Areas containing this locality

AsiaContinent

Eurasian Plate

Izu Bonin ArcVolcanic Arc

Japan

Honshu IslandIsland
Japanese Alps

Philippine Sea PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., Watanabe, Y. (2007) Mineral Resources Map of East Asia, Geological Survey of Japan.

en.wikipedia.org (n.d.) https://en.wikipedia.org/wiki/Toi_gold_mine

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Toi mine, Izu City, Shizuoka Prefecture, JapaniRegional Level TypesToi mineMine (Tourist Attraction) Izu CityCity Shizuoka PrefecturePrefecture JapanCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

Select Mineral List Type

Commodity List

Mineral List

Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Databases

Other Regions, Features and Areas containing this locality

References

Toi mine, Izu City, Shizuoka Prefecture, Japan i
Regional Level Types
Toi mine Mine (Tourist Attraction)
Izu City City
Shizuoka Prefecture Prefecture
Japan Country