Curse of copper
6 March 2013 11:19 PM GMT
Every three to four months, residents of forest villages surrounding Malanjkhand copper mine in Madhya Pradesh pool money to repair their tube wells. Three decades of leaching from the tailings dam of Hindustan Copper Limited (HCL) has turned the region’s groundwater acidic, which corrodes the tube well pipes. Repairing a tube well costs about Rs 1,000, but the Baiga and Gond tribals of these villages have little choice. Acidic mine drainage from Asia’s largest open pit mine has already turned streams and traditional tanks in these forest villages yellowish red and unfit for their daily needs. Worse, the waste has turned their farms barren and shortened their lifespan.
The fate of these 10 villages may soon be shared by another 134 villages and two towns not far from the mine. The state-owned mining company is set to expand its production capacity from two million tonnes per annum (MTPA) to five MTPA. For this, it plans to acquire about 250 hectares, which includes a reserve forest. The expansion project is yet to get clearance from the Union Ministry of Environment and Forests. State forest officials say before giving clearance, they want to ensure that HCL does not discharge its acidic mine waste into water bodies in the forests. HCL officials have, however, begun developing the mine for expansion. HCL claims it will install acid and wastewater treatment plants and geo-textiles to reduce acid drainage. But going by their experience, people and activists doubt the claims. ‘The company has a acid waste treatment plant but it hardly functions,’ says Soumitra Roy of Bhopal non-profit Vikas Samvad. Burden of waste typically, copper occurs as sulphide and carbonate ores in nature. It is recovered either by treating the sulphide ore with dilute sulphuric acid or by grinding the carbonate ore and then treating it with pine oil, lime and xanthate, a toxic compound. The waste material produced during the extraction process contains heavy metals such as molybdenum, nickel, zinc, lead and arsenic. HCL, which began operating the mine in 1982, stores this mine waste in its tailings dam enclosed by piles of fine sand produced while grinding carbonate ores. According to the estimates of Madhya Pradesh Pollution Control Board, the tailings dam holds 50 million tonnes of waste.
Leaching of heavy metals from the dam has substantially contaminated the surrounding environment, says a recent study.
P K Pandey, one of the authors, says usually such acid wastes dumped in tailings dams get neutralised to some extent by natural alkalinity. But this does not happen at Malajkhand due to its geology, made up of volcanic rocks. To worsen the matter, HCL has not undertaken any measures for collection and treatment of the acid waste. This results in leaching and contamination, he adds. Besides, Pandey says, unlike industrial wastewater discharge, there is no permissible limit for heavy metals in wastewater released from mining of base metals like copper in the country. The researchers have found traces of heavy metals in the nearby Banjar river that flows through Kanha National Park. ‘The extent of damage to the environment is so high that it can be termed as criminal negligence,’ the study notes.
Ground reality corroborates the study’s findings. Forest guard Kalhan Singh from Chindi Tola says, until 2006 the groundwater remained clean. That year HCL set up tube wells in the affected villages. But now the acidic mine waste has contaminated aquifers. Though HCL has begun providing tanker water to each village twice a week it is not enough to meet the needs of 1,500 people.
Acidic mine waste and fine sand produced during extraction of copper, have turned the fields infertile.
But will this help alleviate blisters, red patches and several other ailments that the residents deal with every day?
On arrangement with Down to Earth magazine
The fate of these 10 villages may soon be shared by another 134 villages and two towns not far from the mine. The state-owned mining company is set to expand its production capacity from two million tonnes per annum (MTPA) to five MTPA. For this, it plans to acquire about 250 hectares, which includes a reserve forest. The expansion project is yet to get clearance from the Union Ministry of Environment and Forests. State forest officials say before giving clearance, they want to ensure that HCL does not discharge its acidic mine waste into water bodies in the forests. HCL officials have, however, begun developing the mine for expansion. HCL claims it will install acid and wastewater treatment plants and geo-textiles to reduce acid drainage. But going by their experience, people and activists doubt the claims. ‘The company has a acid waste treatment plant but it hardly functions,’ says Soumitra Roy of Bhopal non-profit Vikas Samvad. Burden of waste typically, copper occurs as sulphide and carbonate ores in nature. It is recovered either by treating the sulphide ore with dilute sulphuric acid or by grinding the carbonate ore and then treating it with pine oil, lime and xanthate, a toxic compound. The waste material produced during the extraction process contains heavy metals such as molybdenum, nickel, zinc, lead and arsenic. HCL, which began operating the mine in 1982, stores this mine waste in its tailings dam enclosed by piles of fine sand produced while grinding carbonate ores. According to the estimates of Madhya Pradesh Pollution Control Board, the tailings dam holds 50 million tonnes of waste.
Leaching of heavy metals from the dam has substantially contaminated the surrounding environment, says a recent study.
P K Pandey, one of the authors, says usually such acid wastes dumped in tailings dams get neutralised to some extent by natural alkalinity. But this does not happen at Malajkhand due to its geology, made up of volcanic rocks. To worsen the matter, HCL has not undertaken any measures for collection and treatment of the acid waste. This results in leaching and contamination, he adds. Besides, Pandey says, unlike industrial wastewater discharge, there is no permissible limit for heavy metals in wastewater released from mining of base metals like copper in the country. The researchers have found traces of heavy metals in the nearby Banjar river that flows through Kanha National Park. ‘The extent of damage to the environment is so high that it can be termed as criminal negligence,’ the study notes.
Ground reality corroborates the study’s findings. Forest guard Kalhan Singh from Chindi Tola says, until 2006 the groundwater remained clean. That year HCL set up tube wells in the affected villages. But now the acidic mine waste has contaminated aquifers. Though HCL has begun providing tanker water to each village twice a week it is not enough to meet the needs of 1,500 people.
Acidic mine waste and fine sand produced during extraction of copper, have turned the fields infertile.
But will this help alleviate blisters, red patches and several other ailments that the residents deal with every day?
On arrangement with Down to Earth magazine
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