THE NEWS-Gold mined from sewage sludge

  1. ‡Gold mined from sewage sludge

30 Jan 2009

Gold mined from sewage sludge --

A sewage plant in Japan’s Nagano prefecture has started mining gold from sludge, earning a cool 5 million yen ($56,000) in its first month of operation.

On January 28, sewage plant operator Nagano Prefecture Suwa Construction Office announced that approximately 1.9 kilograms (4.2 lbs) of gold can be mined from each ton of molten fly ash generated when incinerating sludge at its facility in the town of Suwa.

Located in central Nagano prefecture, the Suwa Basin is home to numerous precision machining companies, metal plating facilities and hot springs, which may explain the high concentration of gold in the wastewater sludge.

Joint research conducted in 2007 by Nagano prefecture and the Japan Sewage Works Agency found that the concentration of gold in the ash was comparable to that of a high-grade ore. But because the cost of extracting the gold outweighed the potential profit, the operator continued treating the ash as an industrial waste material.

However, with the recent rise in the price of gold, Suwa decided to start mining the molten fly ash. Last October, they sold 1.4 tons of the ash to a smelting company. At the end of January, Suwa is scheduled to receive its first payment of 5 million yen ($56,000) for the recovered gold.

By the end of March 2009, Suwa plans to mine a total of 5 tons of ash for a profit of 15 million yen ($167,000). The sewage operator says it will use the revenue to help pay for plant maintenance and operating costs.

The facility treats about 100,000 tons of waste water each day, generating about 3 tons of ash in the process.

[Sources: Yomiuri, Nagano Nippo]


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Allegra Sleep Fine Art

Taos, New Mexico

deep fotografie

deep fotografie

Be ▲rtist - Be ▲rt Magazine



the world of art

Psychedelic Traveler

Your psychedelic travel guide around the globe


Just another weblog

Welcome To My World

A World Where Fantasies Are Real And Dreams Do Come True

All Thoughts Work™ Outdoors 5

Hiking with snark in the beautiful Pacific Northwest 2014 - 2017

In the Zone

Photos, art, and a little bit of lit....

power of h Weblog

I wish I'd been born seven hours earlier

The Naturarian

Everything Nature in NE Illinois / SE Wisconsin!

Paint Your Landscape

A Journey of Self-Discovery & Adventure

India Destinations

Exploring Best Indian Destinations for You

Before Sundown

remember what made you smile


Comics und andere Werke des Künstlers Denis Feuerstein


Bit of this, bit of that

Rants, Raves and Random Thoughts

Diary of a Shipwrecked Alien

Tom french's Blog

Tom French Art Blog


Music In The Key Of See


Fe2O3.nH2O photographs

Jon Wilson's 1920 to 1930

-from the bootlegging era to the great depression and bank robbing-


photography and other things

Bohemian Butterfly

Beautiful gardens, garden art and outdoor living spaces

Art by Ken

The works and artistic visions of Ken Knieling.

Global Art Junkie

A curated serving of the visual arts

andrei plimbarici

Calatorind Descoperi

Edward R. Myers Photography

Captured moments of life as I see it

M. K. Waller

~ Telling the Truth, Mainly


Historian. Artist. Gunmaker.

On The Road Again - 2016

Touring the USA on a Moto Guzzi Breva 750. Archives of our trips in 2012, 2013, 2014 & 2015 are also to be found here.

Cavalcade of Awesome

All Pax. All Nude. All the Time.


Welcome to My World......


Poetry, story and real life.

Gypsy Road Trip

Places to go and things to see by Gypsy Bev

All Thoughts Work™ Outdoors

Hiking with snark in the beautiful Pacific Northwest 2011 - 2013



artsy forager

finding the artsy


trying to capture the way

BEN TROVATO – Durban Poison

Columns, letters and rants

The Insatiable Traveler

Embrace Adventure. World Travel | Award-winning Photography| Inspiration | Tips

Stuff and what if...

Exploring writing and the creative randomness of life. Snapshots of moments.

%d bloggers like this: