Treasure Map Japan: Rockhound

Japan: gold, gems & fossils

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Free: Usotannai gold area (80 spots), 27 hands-on facilities, mineral & shark tooth guides. Paid packs: one-time purchase; candidate spots, no guarantee of finds. Scope: Japan only. Every site in this app is in Japan — the app is translated into 10 languages, but the map does not cover other countries. 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 17 minerals and fossils, including placer gold, amber, jade, topaz, obsidian, and fossil shark teeth. ■ Feels like a treasure hunt, grounded in geology • The candidates start from records of real gold mines and localities (AIST's ore deposit data and the literature); their river courses and beaches are then traced with open data from the Geospatial Information Authority of Japan and AIST (rivers and coastline, geological maps, elevation, geochemical maps). Some starter gold packs include rivers with no gold record found nearby; the pack screen says so. • 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 = rank (by each pack's own measure), shape = type of place • Placer gold is shown as points — way-markers to the river; everything else as bands (stretches of river or beach). • 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 at Usotannai Gold Panning Park (Hokkaido), with 80 spots, works just like a paid pack: candidate spots, evidence, and trip logging are all included • Also free, all of it: 27 hands-on facilities and officially sanctioned spots, the mineral field guide (how each mineral forms, identification tips, 20 varieties, 77 specimen photos), the shark tooth species guide (20 species) with a catalog of 9 localities, and 16 verification notes on localities and research notes (including records of trips where nothing was found) • Paid packs are one-time purchases from ¥1,500 per pack — no subscription, no extra charges (the actual price is shown in your store's currency). Same price as the note articles. The app's sites and bands have been rebuilt from new river and coastline data ■ 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 — plan your weekend treasure hunt with records and sources as your guide.

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• iPhone Duo support. On the large unfolded screen and on maps held sideways, zooming in from a count badge, a sample or "See on the map" now shows the sites, and when the map widens as you unfold, marks appear all the way to the edges. • On devices set to a language other than the 10 supported ones, screens mixed Japanese and English; they now show English.

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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    HIROTO KANZAWA
    Size
    41.4 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.
    Languages
    English and 9 more
    • English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Wakuya Koganeyama Sankin Iseki $24.99
    • Topaz Bundle $12.99
    • Fossil Shark Teeth Bundle $24.99
    • Quartz Crystal Bundle $19.99
    • Peridot Bundle $14.99
    • Fluorite Bundle $12.99
    • Obsidian (Tokachi stone) $49.99
    • Garnet & Sapphire Bundle $17.99
    • Ammonite Bundle $29.99
    • Amethyst Bundle $11.99
    Copyright
    © 2026 kinpatusan