![[Studio Ghibli] Castle in the Sky Laputa – Kitasawa Floating Ore Dressing Plant Niigata Prefecture](https://anime-place.site/cms/wp-content/uploads/2026/06/img_2650.jpg)
The Kitazawa Floating Concentration Plant, located on Sado Island in Niigata Prefecture, has recently garnered attention from many tourists and photography enthusiasts as a ruins that evokes the worldview of Studio Ghibli’s masterpiece “Castle in the Sky.” The remains of a concentration facility that once boasted the largest scale in East Asia are now covered in greenery, creating a fantastical atmosphere.
This article comprehensively explains information you should know before visiting, from the historical background of the Kitazawa Floating Concentration Plant, its connection to Laputa, actual highlights, access methods, to photography tips.
What is the Kitazawa Floating Concentration Plant? Basic Information and History
The Relationship Between Sado Gold Mine and Kitazawa Floating Concentration Plant
The Kitazawa Floating Concentration Plant was constructed in 1937 (Showa 12) as an ore processing facility for the Sado Gold Mine. The Sado Gold Mine is one of Japan’s largest gold and silver mines, continuing from the Edo period, and modernization progressed after the Meiji Restoration. At its peak, it processed approximately 50,000 tons of ore per month.
The Kitazawa Floating Concentration Plant was built to efficiently extract gold and silver from this massive amount of ore, and it adopted the cutting-edge “flotation concentration method” for its time. This technology made it possible to recover minute gold and silver particles that could not be recovered by conventional methods.
A Concentration Facility That Boasted East Asia’s Largest Scale
At the time of its construction, the Kitazawa Floating Concentration Plant was known as one of East Asia’s largest flotation concentration facilities. The facility had a height equivalent to a four-story building, with a total area of approximately 18,000 square meters. Its sturdy reinforced concrete structure represented the pinnacle of Japan’s construction technology at the time.
Within the facility, crushed ore was agitated together with water and chemicals, and minerals containing gold and silver floated up with bubbles. Through this process, just a few grams of gold and silver in the ore were efficiently recovered.
From Closure to Present
In 1952 (Showa 27), management of the Sado Gold Mine transferred from Mitsubishi Mining to Mitsubishi Metal Mining, and operations continued thereafter, but the mine closed in 1989 (Heisei 1) due to deteriorating profitability. After closure, the facility was left abandoned and gradually took its current form through natural erosion.
Currently, it is managed by Sado City and preserved as an industrial heritage site. From the 2010s onward, it became a hot topic on social media as “a ruin like Laputa,” and has once again attracted attention as a tourist destination.
Why is it Called “Castle in the Sky”?
Common Points with Laputa
The reason the Kitazawa Floating Concentration Plant is associated with “Castle in the Sky” lies in its unique landscape:
- Ruins Covered in Greenery: The entire facility is covered with ivy, moss, and trees, creating a fantastical landscape where nature and artificial structures merge. This evokes the ancient civilizations covered in plants that appear in the film.
- Massive Concrete Structures: Reinforced concrete structures equivalent to a four-story building stand like ancient fortifications.
- Mystique of Industrial Heritage: A facility that once boasted cutting-edge technology has become ruins, evoking the passage of time. This overlaps with Laputa’s theme of “lost civilization.”
- Brick Arches: The brick arches and structures remaining in parts of the facility have an atmosphere reminiscent of European ancient castles.
Not an Official Model, But the Atmosphere is Strikingly Similar
As an important point, the Kitazawa Floating Concentration Plant has not been officially recognized by Studio Ghibli or director Hayao Miyazaki as a model for “Castle in the Sky.” Since “Castle in the Sky” was produced in 1986 and the Kitazawa Floating Concentration Plant closed in 1989, it is unlikely to be a direct model from a chronological perspective.
However, due to its strikingly similar atmosphere to the film’s worldview, it is cherished among fans as “a place like Laputa.” In fact, many visitors have remarked, “It feels like I’ve wandered into the world of Laputa.”
Highlights of the Kitazawa Floating Concentration Plant
1. Massive Concrete Ruins
The greatest highlight is undoubtedly the massive concrete structure. The main body of the concentration plant, reaching approximately 15 meters in height, demonstrates its presence even from a distance. This structure, equivalent in height to a four-story building, has a layered interior where different concentration processes were performed on each floor.
Currently, entry to the interior is prohibited for safety reasons, but the exterior alone is overwhelmingly impressive. Especially at dusk, the ruins illuminated by the setting sun glow golden, creating a mystical atmosphere.
2. Thickener (Concentration Tank)
In front of the concentration plant stands a gigantic circular pool with a diameter of approximately 50 meters. This is called a “thickener,” a concentration tank that was used to allow mine tailings to settle after concentration.
Water currently accumulates in this pool, and you can see beautiful scenery with the surroundings and sky reflected on the water surface. Particularly on windless days, the ruins reflect on the mirror-like water surface, making it a popular spot for fantastical photography.
3. Stairs and Passages Covered in Greenery
Stairs and passages that were once used by workers remain within the facility. These are now covered with ivy and moss, creating an atmosphere like ruins in a jungle.
Particularly from spring to summer, the greenery becomes thicker, enhancing the “Laputa feeling” even more. Some of the stairs are accessible to visitors, allowing for close observation.
4. Brick Structures
Brick buildings also remain around the concentration plant. In particular, the brick wall of the former power station forms beautiful arches reminiscent of European ancient castles and has become a popular photography spot.
The traces of time carved into each brick tell the history this facility has witnessed.
5. Night Illumination (Seasonal)
In recent years, the Kitazawa Floating Concentration Plant is illuminated during specific periods as an event. The massive ruins floating in darkness create a different fantastical atmosphere than during the day.
The illumination period varies by year, so it’s recommended to check with the Sado City Tourism Association before visiting.
Access Methods and Surrounding Information
Access to Sado Island
Since the Kitazawa Floating Concentration Plant is on Sado Island, you must first cross to the island.
From Niigata Port:
- Use Sado Steamship’s car ferry or jet foil
- Car ferry: approximately 2 hours 30 minutes
- Jet foil: approximately 1 hour
- Arrival at Ryotsu Port
From Naoetsu Port:
- Use Sado Steamship’s car ferry
- Approximately 1 hour 40 minutes
- Arrival at Ogui Port
Access to the Kitazawa Floating Concentration Plant
From Ryotsu Port:
- By car: approximately 40 minutes (via Prefectural Route 65)
- By bus: “Main Line” toward Aikawa, get off at “Sado Hanga-mura” bus stop, approximately 10 minutes walk
From Ogui Port:
- By car: approximately 50 minutes
Rental Car Recommended:
Since public transportation is limited on Sado Island, renting a car is convenient. Rental car companies are available at both Ryotsu Port and Ogui Port.
Parking Information
There is a free parking lot at the Kitazawa Floating Concentration Plant. Approximately 20 regular cars can be parked. The lot may become crowded during tourist season and weekends, so visiting early is recommended.
Nearby Tourist Spots
There are other points of interest around the Kitazawa Floating Concentration Plant:
Sado Gold Mine:
- Approximately 5 minutes by car from the concentration plant
- You can view mining tunnels from the Edo period
- A museum where you can learn about the history of the gold mine
Historic Site Sado Gold Mine:
- Two mining course options: Sotayuu Tunnel and Doyuu Tunnel
- Human figures recreate Edo period mining scenes
Kirari-um Sado:
- Right near the Kitazawa Floating Concentration Plant
- Free rest facility
- Displays about the history of the Sado Gold Mine
Omagata Port Ruins:
- Remains of a former port used to transport ore
- Historical atmosphere remains
Precautions and Etiquette When Visiting
Safety Considerations
- Respect no-entry zones: Some areas are deteriorating and are dangerous. There are markers for off-limit areas—obey them.
- Watch your footing: Much of the area is unpaved, and some places are unstable. Wear shoes suitable for walking.
- Danger of collapse: Parts of the structures risk collapse. Avoid getting too close to buildings.
- With children: If visiting with small children, special care is necessary. Keep them in sight at all times.
Consideration and Etiquette
- Take trash with you: Despite being ruins, this is an important industrial heritage site. Always take your trash with you.
- Don’t damage the facility: Graffiti and destruction of structures are strictly forbidden.
- Be mindful of noise: There are residences in the surrounding area. Avoid loud voices and other actions that might disturb neighbors.
- Beware of private property: There is private land in the surrounding area. Do not enter areas marked as off-limits.
Best Times and Hours to Visit
Recommended Seasons:
- Spring (April–June): Fresh greenery is beautiful, and the “Laputa feeling” is strongest
- Summer (July–August): Dense greenery, with a sense of vitality
- Autumn (September–November): Beautiful contrast between autumn foliage and the ruins
- Winter (December–March): Snow-covered ruins are fantastical, but be careful as footing is slippery
Recommended Times of Day:
- Early morning: Few people, quiet viewing. Especially mystical on misty days
- Late afternoon: The ruins lit by the setting sun are beautiful. Experience the atmosphere of the “golden concentration plant”
- Daytime: Bright and easy to observe details
Photography Tips and Recommended Spots
Scenic Photography Points
1. Full View Through the Thickener:
Compose with the concentration tank (thickener) in the foreground and the concentration plant body in the background. You can also capture reflections on the water surface.
2. Powerful Shot from the Front:
Photographing the concentration plant from the front, looking upward, expresses its massive scale and impact.
3. Framing with Greenery:
Photographing the ruins through ivy or trees in the foreground enhances the “Laputa feeling.”
4. Close-up of Brick Arches:
Photographing the details of brick structures conveys the weight of history.
5. Twilight Silhouette:
Photographing the ruins as silhouettes during twilight creates dramatic images.
Photography Techniques
Using a Wide-Angle Lens:
To capture the entire massive structure, a wide-angle lens (24mm or below) is effective. With smartphones, use the ultra-wide-angle mode.
HDR Photography:
In scenes with significant contrast, HDR (High Dynamic Range) photography allows you to beautifully express both bright and dark areas.
Long Exposure:
Using a tripod for long exposure makes the water surface smoother and enhances the fantastical atmosphere.
Include People for Scale:
Including people in your shots effectively emphasizes the magnitude of the structures.
Drone Photography
Recently, aerial shots with drones have become popular, but note the following:
- Check Sado City regulations and restrictions
- Comply with the Civil Aeronautics Law (permits for flights over densely populated areas, etc.)
- Be considerate of other tourists
- It’s desirable to check with the facility management in advance
Historical Value of the Kitazawa Floating Concentration Plant
Importance as Modern Industrial Heritage
The Kitazawa Floating Concentration Plant is not merely a “ruin,” but an important piece of industrial heritage that supported Japan’s modernization. In 2007, it was certified as a “modernization industrial heritage” by the Ministry of Economy, Trade and Industry.
The Sado Gold Mine as a whole is being considered for UNESCO World Heritage status as valuable heritage demonstrating the evolution of mining technology from the Edo period through the Showa period. The Kitazawa Floating Concentration Plant is an important constituent element within it, demonstrating cutting-edge technology from the early Showa period.
Technical Significance of the Flotation Concentration Method
The flotation concentration method employed at the Kitazawa Floating Concentration Plant was innovative technology for its time. This method made it possible to recover gold and silver from low-grade ore that was previously discarded, advancing resource utilization.
This technology played a crucial role in the development of Japan’s mining technology and significantly influenced subsequent mining development.
Toward World Heritage Registration of the Sado Gold Mine
The Sado Gold Mine aims for UNESCO World Heritage Cultural Site registration as the “Gold Mine of Sado Island.” It is evaluated as valuable heritage demonstrating over 400 years of evolution in mining technology—from hand-digging in the Edo period to modernization after the Meiji Restoration to cutting-edge Showa-era technology.
The Kitazawa Floating Concentration Plant occupies an important position within this, representing technological innovation of the Showa period. When World Heritage registration is realized, its value will be internationally recognized.
Enjoying Sado Island Tourism Together
The Charm of Sado Island
When visiting the Kitazawa Floating Concentration Plant, enjoy other charms of Sado Island as well.
Natural Beauty:
- Spectacular views of Ono Kame (site of dayflower clusters)
- Blue sea at Senkaku Bay
- Futatsu Kame Beach
- Toki Forest Park (observe the special natural monument bird Toki)
Culture and History:
- Sado Gold Mine (Sotayuu Tunnel and Doyuu Tunnel)
- Sado Bugyo-sho ruins
- Myosenaji Temple (five-story pagoda)
- Shukune-ki (Important Traditional Building Preservation District)
Cuisine:
- Fresh seafood (yellowtail, crab, squid, etc.)
- Sado beef
- Sake (Sado has 5 sake breweries)
- Okesa persimmons
Sample Course Examples
1-Night, 2-Day Course:
*Day 1*:
- Morning: Travel to Sado from Niigata Port (arrive at Ryotsu Port)
- Lunch: Fresh seafood lunch at Ryotsu
- Afternoon: Toki Forest Park → Kitazawa Floating Concentration Plant → Sado Gold Mine
- Evening: Stay overnight in Aikawa district
*Day 2*:
- Morning: Senkaku Bay → Ono Kame
- Lunch: Walking and lunch at Shukune-ki
- Afternoon: Return to Niigata from Ogui Port
Day Trip Course:
- Take jet foil to Ryotsu Port (approximately 1 hour)
- Rent a car and visit Kitazawa Floating Concentration Plant → Sado Gold Mine
- Fresh seafood lunch in Aikawa
- Return to Niigata via jet foil from Ryotsu Port
Conclusion: A Rare Spot Where You Can Experience the World of Laputa
The Kitazawa Floating Concentration Plant is one of Japan’s finest industrial heritage sites that evokes the worldview of Studio Ghibli’s “Castle in the Sky.” The massive concrete structure, covered in greenery, preserves traces of the concentration facility that once boasted East Asia’s finest, while displaying a unique beauty merged with nature.
Visiting with an understanding of its historical value as an important piece of industrial heritage supporting Japan’s modernization, rather than merely as a “ruin,” allows for a deeper emotional experience.
Although accessing this remote island location requires some travel time, it offers a special atmosphere unique to those who make the journey. Why not experience this “world of Laputa” at the Kitazawa Floating Concentration Plant, where beautiful nature, abundant seafood, and historical heritage converge on Sado Island?
When visiting, prioritize safety, follow proper etiquette, and maintain awareness of preserving this valuable industrial heritage for future generations. Enjoy wonderful photography while remembering the importance of caring for the heritage. Have a wonderful experience.
