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Case Study: Guadiamar River.

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Introduction

Case Study: Guadiamar River On April 25, 1998 At the Los Frailes Mine, owned by the Swedish/Canadian Company Boliden, The dam burst which was holding back the toxic mining waste. Boliden claim that this was due to Seismic shift but other people said that local authorities have received warnings that the Dam was unstable and likely to break. The Wave contained approximately 5 cubic metres of Toxic sludge including the poisonous lead, arsenic, zinc and mercury. The sludge flowed into the Guadiamar River, the marshlands and the Intramurals. The toxins destroyed all life in the stretch of the river. The river of Sludge was finally stopped at the entrance to Do�ana National Park, thanks to the hasty construction of an emergency Dam. ...read more.

Middle

Short Term Effects 1. 400 acres of Farmland was destroyed by toxic sludge resulting in �6 million pounds worth of damage. 2. The Guadiamar River was almost completely blackened with sludge. 3. A Great amount of the animals in the river were killed, having knock-on effects throughout the food chain. 4. 400 families had their water supply polluted. 5. Homes by the river were flooded. 6. People living within the effected area suffered itching, rashes and difficulty in breathing. 7. Do�ana National Park was in danger from pollution. Long-term Effects 1. The people lost trust in the authorities for their slow reaction to the disaster 2. If the topsoil is not removed before the autumn rains come they will carry the pollution into the Park. ...read more.

Conclusion

The front of the slide is about 20 metres wide, and it is located in the area of the junction of the two impoundments. 2. The dam cracked and broke 3. Between five and seven million cubic metres of contaminated slurry spilled through the gap. 4. This caused the bed of Rio Agrio to locally rise three metres. They also gave some information about the element concentration in the soil. Element/Concentration of the pyrite sludge: grams/tones Zn 8,000 | Pb 8,000 | As 5,000 | Cu 2,000 | Co 90 | Tl 55 | Bi 70 | Cd 28 | Hg 15 | High pyrite purity 68-78% Very fine granulometry, 50% of the particles are smaller than 8 Microns and particles smaller than 10 microns can be inhaled. All these tell us how serious the problem is in the River Guadiamar, Spain. ...read more.

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