Tano Mine (Yashio Mine; Oniishi Mine), Oniishi-machi (Onishi-machi), Tano-gun, Gunma Prefecture, Kanto Region, Honshu Island, Japan

Ref.: Rocks & Min.: 22:113, 223. A cobalt and nickel mine. Ore is disseminated, chiefly in serpentine. Owned by Nippon Nickel Kogyo Co., but no longer operational.

Mineral List:

	Ardennite-(As)

	'Cobaltoan Polydymite'

	'Serpentine Group'

3 entries listed. 1 valid mineral.

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