Tailings Ponds - a Threat to Chilean Communities

Chile lives under the constant threat of spillage from tailings ponds, which became even more marked in late March after heavy rains fell in the desert region of Atacama leaving over two dozen people dead and missing and thousands without a home

Copiapó, capital of the region of the same name, 800 km north of Santiago, is in an area full of tailings dams, Henry Jurgens, the founder of the non-governmental organisation Relaves (Tailings), told Tierramérica.

He explained that pollution with heavy metals "was already a reality" before the recent thunderstorm and flooding, but that the catastrophe "made this reality visible and more severe."

In early April, the organisation detected tailings pond spills when it took water and mud samples in different parts of the Atacama region. But the government's National Geology and Mining Service (Sernageomin) reported that the tailings impoundments that hold toxic waste are in stable condition.

The Atacama desert, the world's driest, was the main natural area affected by the flooding caused by the Mar. 23-24 heavy rainfall, which dropped the equivalent of one-quarter of a normal year's precipitation on the area.

Experts say the rain may have stirred up heavy metals lying quietly in abandoned ponds.

Tailings, the materials left over after valuable minerals are separated from ore, contain water, chemicals and heavy metals such as cyanide, arsenic, zinc and mercury, deposited in open-air ponds or impoundments.

These toxic substances build up in the body and cause serious health problems.

Arsenic, for example, has no color, odor or taste, which makes it undetectable by people who consume it. Experts warn that long-term exposure to high levels of arsenic in drinking water can cause cancer of the skin, lungs or bladder.

The main source of wealth in this mining country is copper. In 2014 alone, this country of 17.5 million people produced 5.7 billion tons of copper, 31.2 percent of the world total.

But for each ton of fine copper produced, 100 tons of soil with toxic by-products must be removed and stored.

There are 449 identified tailings ponds in this country, according to official figures. But there are dozens of others that have not been "georeferenced," another member of Relaves, Raimundo Gómez, complained to Tierramérica.

"There is no real register of abandoned tailings ponds in the country," said Gómez. "Sernageomin estimates that there are 90 of these toxic deposits in the Atacama region alone. That is really a lot."

He also noted that "there is a great lack of information about the issue; communities do not know that they are living next to tailings ponds, and people are unaware of the danger that they pose to health and that they pollute the water."

"We can see the profits left by mining. But we don't see the negative effects, which we all end up paying in the end," Gómez said. "It's like when you go to a dinner and you talk about how delicious it was, but you don't tell what you did in the bathroom afterwards."

The earthquake that shook Chile on Feb. 27, 2010 caused the collapse of an abandoned tailings pile that buried an entire family under tons of toxic sludge.

The victims, a couple and their two children, worked on the farm where Jurgens and his family lived for six years near the southern town of Pencahue, unaware that they were living next to a toxic, unstable tailings pile.

"It wasn't till then that I found out what it was, and all the things that could happen," he said.

"People are totally ignorant about this. They're often drinking polluted water and aren't warned by the relevant institutions….That's just humiliating and terrible," Jurgens said.

Although experts say the worst risk is posed by abandoned tailings dumps, the ones that are still in use can also be dangerous.

Source: IPS

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Taxonomy

• Sludge Separation
• Environment
• Pollution