Our last environmental investigation in Cerro de Pasco

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Our last environmental investigation in Cerro de Pasco

Last year, in October 2022, our staff was in Cerro de Pasco again to extend the investigation of the environmental impacts in the whole district of Simon Bolivar, affected by the recovery of mining activities after the lockdown of the last two years of the pandemic.

We collected more than 12 soil samples in important sites to test heavy metals pollution in school gardens, playgrounds, agricultural soils (where local people grow maca, potato, and quinoa), and pasture land for alpaca, lama, sheep, and cows. We also sampled soils in the surrounding of Carhuamayo city, 40 km far from Cerro de Pasco, but not affected by mining activities, useful as background data.

We also collected 19  water samples across the district of Simon Bolivar to check the most important pollution indicators to assess sources of pollution in lakes, rivers, tap waters, and mining wastewater.The water quality investigation shows high contamination levels of lead, arsenic, cadmium, chromium, and nickel, above the background values and national and international standards, in lagoons, rivers, and mining effluents in the Simón Bolívar district.

In all the hydrographical basins investigated, 115 violations of the Peruvian norms regarding the protection of water resources were recorded.

The levels of metals found in the mining effluents of the Empresa Administradora Cerro SAC (Volcan Compañía Minera SAA), exceed the national limits with alarming percentages (cadmium: 60%; iron: 3400%; zinc 8500%; lead: 20%), contributing to the contamination in the micro-basin of the Ragra river and from there to the San Juan river basin which flows into the natural reserve lagoon of Junin, also known as Chinchaycocha lake.

This study has demonstrated 25 violations of the Peruvian law regarding soil protection.

This study demonstrates the presence of highly toxic metals such as lead, mercury, cadmium, and arsenic, in soil samples from the Simón Bolívar district, in concentrations higher than the background values and national and international quality standards, both in urban soils of the city as in grassland and agricultural soils. On average, lead concentrations in the five recreational soil samples and in the five agricultural and pasture samples collected in Simón Bolívar district exceeded more than 20 times Carhuamayo soil concentrations.In addition to their toxicity, many of the metals found in soils are furthermore carcinogenic, according to the International Agency for Research on Cancer classification.  

Soil contaminated with toxic and carcinogenic substances represents a risk to human health through ingestion and/or dermal contact exposure.

Source International recommends prioritizing actions toreduce the release of pollutants into the environment. Establishing a list ofpolluting sources is urgent so that competent authorities can work for mitigation,prevention, and control actions. The different local, regional, and nationalauthorities are reiterated to continue applying urgent measures that SourceInternational has been denouncing for more than 10 years.

In august 2023, Source International will fly back to Cerro de Pasco to share all these important data with affected communities, local and regional authorities and the staff will join national public events to update on its recent investigations, pushing some policymakers to act urgently.


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