Gold mining a toxic legacy..

Martha Gold Mine, Waihi, Coromandel.

Modern Hard-rock mining is toxic no matter what any mining company says. The extraction process uses large amounts of toxic reagents, usually cyanide, and also liberates toxic heavy metals. The process produces so much toxic waste that storage at or near the mine, forever, is the only viable way to manage it. The waste tailings reservoirs invariably leak toxins into the environment and often faildisastrously.

The process leaves this toxic legacy whether the mining is from an open pit or from tunnels under the ground. This is because only a few grams of gold are extracted from each tonne of rock and the rest becomes toxic waste.

We don’t even need more Gold. Some 31,000 tonnes of gold are held in reserve by central banks and the IMF. Another 2,000 tonnes is traded as bullion. This is enough to supply the world’s industries for more than 100 years.

A good example of Gold Mining in New Zealand can be found at Waihi, in the Coromandel.  Mining in Waihi has a history that spans three centuries. Gold was discovered in the 1800s and mined underground in the first half of the 1900s. The last 24 years of the 1900s focused on exploration, development and mining of the Martha Mine open pit. In the 2000s the open pit continues to operate while the Favona underground mine was developed – at the end of 2004 – and the Trio underground mine began construction activities in 2010. However, mining operations today are very different to the historic underground mining days.  Source:/  

In spite of the changes in mining practices over the years a legacy of concern continues…

Martha’s Mine April 2016: About two million tonnes of rock and rubble collapsed from the north wall of the Martha Mine, sending rocks the size of houses tumbling into the pit, and more is expected.

‘The historical legacy of gold mining is not only toxic contamination but the impoverishment & undermining of local communities.’  After a slip at Martha’s Mine (Coromandel April 2016) a number of people spoke out about their concerns.  Waihi resident Collette Spalding spokeswoman for ‘Distressed Residents Action Team’, said there was concern in the town.
“For it to be an unstable industrial site in the centre of town with the potential to fall in like that is a bit of a concern, really,” Spalding said.  She said the original design of the pit was poor, rock falls inevitable and the entire structure of the pit could be compromised. It’s been incorrectly designed right from the start,” she said.

Green Party MP Catherine Delahunty

Green Party MP Catherine Delahunty​ said the slip put the future of the Martha Mine in doubt.  “It seems that OceanaGold are not managing it properly because it continues to slip. This is the second major slip on that north wall,” Delahunty said.
“Our concern is the people of this community have so much uncertainty being left with literally an unstable situation right at the heart of their town.”


Barry Road, Waihi Collapses into a 50 metre by 15 metre hole, December 2001

Waihi, Barry Road house collapses

In 2010 the Martha mine was opencast, but an underground mine had operated until 1952. It was common to mine inclined veins of ore in step-like excavations (stopes) and back-fill them with waste rock. After 1914 stopes were no longer back-filled, and could become unstable. This Barry Road house collapsed into a 50-metre by 15-metre hole in December 2001. In the end, 26 people lost their homes. An expert report identified nearby streets that were also on top of unfilled voids; these areas were cleared and residents compensated.


Mining is never without incident no matter how good the technology. The following report from ABC dated 2012 highlights some New Zealand background prior to the Pike River Disaster in 2010.  ‘New Zealand’s mining industry has claimed hundreds of lives since it began over a century ago.’ Below are some of the worst disasters in its history:

Full Article:  

A worker at Waihi’s Correnso underground mine died after his loader rolled in the mine

Sadly & respectfully to a life lost, this article was reported on the 29 July 2016:   Miner found dead after front-end loader rolls in Waihi goldmine.  The Correnso gold vein was discovered in 2006 and the mine is between 150 and 300 metres below residential properties in Waihi. Source:


Waihi gold mine set to expand beneath residents’ houses:   28 March 2018

Waihi’s mining company announcement is still “sinking in” for Waihi residents.
OceanaGold Waihi announced today its plans for a new underground mine to start underneath the Martha pit and reach some of the residential areas of town near Gilmour, Kenny and Mueller Sts.

The proposal, called Project Martha, will see the mining company returning to the open pit for more gold.


Support article:  OceanaGold proposes new underground mine at Waihi

Only a few grams of gold are extracted from each tonne of rock and the rest becomes toxic waste..