Where: Japan · Asia · approx. 35.85, 138.58 (vicinity only)
Why this spot: Rockhounding locality (historic): source of Japan-law twin quartz that built Kofu's gem-cutting industry; now closed
What turns up: nothing collectible in the field; Japan-law twins and Otome quartz seen in Kofu museums and mineral shops
Access: Prohibited / view only.
The mine closed in the 1970s and Yamanashi Prefecture keeps it gated and off limits, citing fire and slope-collapse risk; collecting is prohibited and enforced, so the Kofu district today means museums, lapidaries and paid gravel-sluice attractions, not wild collecting
Open in Mudlark Map →
Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.
Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.