Japan Discovers High-Grade Gold Ore After 45 Years, Eyes First New Mine Since 1981

Japan has discovered multiple deposits of high-grade gold ore for the first time in 45 years, with foreign mining companies finding ore containing up to 118.5 grams of gold per ton. The discoveries in Kagoshima Prefecture and Hokkaido could lead to Japan’s first new commercial gold mine since 1981, when the Hishikari Mine was found. Global mining economics require only 3 grams per ton to be viable, making these deposits exceptionally rich.

Canadian company finds gold-rich ore in former Yamano mine

Canadian exploration company Irving Resources announced in March that it discovered high-purity ore containing between 10.30 and 46.10 grams of gold per ton at the former Yamano Gold Mine site in northern Kagoshima Prefecture. The Yamano mine, discovered in 1640, recorded Japan’s highest gold production during the late Edo period before closing in 1965. Irving Resources believes only limited veins were developed historically and is conducting additional exploration to expand reserves.

Hokkaido deposits show world-class gold concentrations

Since 2019, Irving Resources has continuously discovered high-grade ore in Omu Town in northern Hokkaido. The company’s first drilling confirmed ore containing 118.5 grams of gold per ton, far exceeding the 3-gram threshold needed for economic viability. In October 2025, additional drill holes yielded ore with up to 24.22 grams of gold per ton, demonstrating consistent high-grade deposits across multiple locations.

Deep-sea hydrothermal vents reveal gold-rich mineral formations

Japanese researchers from Shizuoka University, Waseda University, and Tokyo University discovered gold-bearing mineral deposits in hydrothermal vents 350 kilometers south of Tokyo. Using advanced secondary ion mass spectrometry (SIMS) technology, scientists detected extremely high concentrations of invisible gold within pyrite minerals formed at seafloor hydrothermal vents. The gold exists in two forms: ultrafine nanoparticles and individual gold atoms embedded in mineral crystal structures, with concentrations representing the highest recorded globally.

Commercial mining viability hinges on reserve volume and extraction costs

The key to commercial mining is confirming actual reserve volume. Japan has not had a commercial gold mine in 45 years, making any new development a significant economic event. The recent deposits’ relatively shallow depth and exceptionally high gold content make them promising candidates for future mining operations, though environmental concerns surrounding deep-sea mining remain under international review.

Final Thoughts

Japan’s discovery of world-class gold deposits after 45 years could reshape the nation’s mining sector and reduce dependence on imports. With ore grades 30 to 40 times above global economic thresholds, commercial development appears increasingly feasible if environmental and regulatory hurdles are cleared.

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