Treasure Map Japan: Rockhound
Gold, gems & fossil site guide
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
A map of candidate collecting spots across Japan — places where you may be able to pick up stones — selected by cross-checking geological data with published occurrence records. It covers 20 minerals and fossils, including placer gold, amber, jade, topaz, obsidian, and fossil shark teeth.
■ Feels like a treasure hunt, grounded in geology
• The candidates are not guesses. We cross-reference open data from the Geospatial Information Authority of Japan and the Geological Survey of Japan, AIST (geological maps, mineral deposit databases, elevation, geochemical maps) with occurrence records from the literature.
• Every spot shows the evidence for why it made the map: distance to the source rock, the nationwide percentile of its streambed geochemistry, even the terrain conditions.
■ Reading the map is simple
• Color = mineral, size = potential, shape = type of place
• Placer gold is shown as points; everything else as bands (stretches of river or beach). The display follows the physics of specific gravity.
• Solid line = a stretch confirmed as beach or gravel bar with data; dashed line = a candidate stretch to verify on site
■ Start free
• The free placer gold area (Usotannai, Hokkaido) and the Choshi shark tooth fossil pack cost nothing
• Also free: 26 hands-on facilities and officially sanctioned spots nationwide, plus a mineral field guide with identification tips
■ Made for the field
• All candidate data is built into the app. Locations, evidence, and trip logging work even with no signal.
• GPX export links up with hiking GPS apps
• Every spot shows an ease-of-access rating (distance from the road, slope)
■ Being honest with you
• This app is a map of candidates. It does not guarantee that you will find anything.
• Off-limits areas such as natural monuments are included too — clearly marked as no-collecting rather than hidden.
• Always check access and collecting rules for each location before you go.
Gold panning, rockhounding, beachcombing, fossil hunting — turn your weekend treasure hunt from a matter of luck into a search backed by evidence.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Easier-to-read advisories: point screens now show a one-line summary you can tap to expand (pack details before purchase still show the full text)
- Prices fully revised: many packs are now cheaper, priced by the length of verified sections
- Products reorganized into three tiers: per-area packs, small-area libraries, and bundles
- Fixed mismatches between pack names and contents
- Updated the free-area guide
The developer, HIROTO KANZAWA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- HIROTO KANZAWA
- Size
- 35.4 MB
- Category
- Navigation
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 9 more
- English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Complete Collection $399.99
- All Minerals Bundle $249.99
- Kyushu & Okinawa Bundle $49.99
- Placer Gold Tohoku Bundle $99.99
- Placer Gold Chubu Bundle $99.99
- Placer Gold Kinki Bundle $34.99
- Placer Gold All Japan Bundle $299.99
- Placer Gold Hokkaido Bundle $99.99
- Peridot Pack $9.99
- Fluorite Pack $9.99
- Copyright
- © 2026 kinpatusan