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Photo: Ana Rodríguez Carrington (CC BY 2.0)Victory: Biosphere Reserve in Baja California Saved from Toxic Mine
Known as an “ecological treasure house,” the Sierra La Laguna Biosphere Reserve at the southern tip of Baja California will not be spoiled by toxic mine waste, thanks in part to AIDA’s advocacy.
The reserve was once an island, so it’s home to rare plant and animal species. Canyons, swimming holes, and hot springs can be found in its granite mountain range and lowland tropical forests.
Thanks to AIDA and our partners in Mexico, the Mexican government denied an environmental permit for the Paredones Amarillos gold mine, halting the project for the time being. To protect the biosphere reserve, AIDA helped educate community groups and decision makers about the mine's risks. This helped to build the political momentum necessary for the government to deny the permit.
To extract gold from the mountains, the Canadian company Vista Gold proposed to carve out huge quantities of rock—each ton containing a mere gram of gold–-grind it into sludge, and treated it with cyanide. The company planned to dump massive amounts of toxic waste (called “tailings”) behind a dam intended to store it forever. Unfortunately, tailings dams can break for various reasons, as happened at Bolivia’s Porco mine in 1996. When that dam collapsed, more than a quarter million metric tons of tailings flooded the river and contaminated 500 miles (800 km) of waterways in Bolivia, Argentina and Paraguay.
The mine could also cause acid mine drainage. When sulfur-containing rocks are exposed to air and water, sulfuric acid forms, which causes toxic heavy metals to dissolve and drain into the watershed. The risk of acid mine drainage in Sierra La Laguna was significant and the human and environmental cost would have been tremendous: thousands of people and countless wildlife in the reserve rely on its water for survival.
Depleting freshwater is a further threat because mines use tremendous quantities of water. Owing to the scarcity of water in the reserve, Vista Gold proposed to build a plant on the Pacific coast to remove salt from sea water in a highly energy-intensive process, and then pump the water 45 km to the mine site. The desalination plant posed a threat to the endangered leatherback sea turtle.
Singly and together, the mine’s impacts would have devastated a rare jewel, a unique and lush paradise worth saving for future generations.
Related projects

Did you know coral reefs produce medicine?
“How can coral reefs contribute to modern medicine?” I wondered as I spoke to a group of doctors and nurses working on liver disease in Mexico. My uncle is part of the organization (Amihigo) and has long been interested in my work as a marine attorney with AIDA. When I got back from the meeting, the information I found backed up our discussion and clarified the link between our two worlds: coral reefs are natural, underwater pharmacies. The plants and animals living in reefs have developed chemical compounds to protect themselves against predators, fight diseases, and prevent the excessive growth of competing organisms. Corals have been recognized as an important source of new drugs to treat cancer, arthritis, Alzheimer’s, bacterial infections, viruses and heart disease, among other serious illnesses, according to the US-based National Ocean Service. The pharmaceutical industry has found corals provide value in the development of new products. Certain corals, for example, stimulate the welding of broken bones. Components of a Caribbean sponge allow for the creation of Zidovudina, a medicine used to treat HIV. Despite these discoveries, the medical use of coral reefs is considered underdeveloped. As an environmental attorney, what I take away from this realization is that if coral reefs are not effectively preserved, their great potential for modern medicine will never be fully realized. It’s a real threat. Studies estimate that 30 percent of the world’s reefs are already seriously damaged, and that 60 percent could disappear by 2030 due to water pollution, destructive fishing methods, overfishing, and other unsustainable human activities. Compounding these is the growing threat of climate change. Several Latin American nations are blessed with large areas of coral reefs that provide environmental and social benefits. But many don’t do enough to protect that wealth. Mexico’s coastline extends for more than 11 thousand kilometers, featuring 5,100 square kilometers of islands, reefs and cays. Its coral reefs span six major regions: the Gulf of California and the Western Mexican Pacific Coast, the Revillagigedo Archipelago, the Marias Islands, the South Pacific Coast, the Gulf of Mexico Reef Corridor and the Campeche Bank, and the Mexican Caribbean. The loss and degradation of these rich reef systems is a growing problem across the country. Unsustainable and poorly planned urban and coastal development is causing sedimentation and pollution, resulting in the growth of microalgae that rob light and oxygen, effectively suffocating the corals. In the Veracruz Reef System, the largest in the Gulf of Mexico, the expansion of the Port of Veracruz is doing just that. To protect reefs, it’s imperative that governments act with caution when approving land use in urban development plans to avoid damaging coastal wetlands (lagoons, bays, mangroves, coastal dunes and sea grasses, among others), and that they adopt adequate measures for wastewater treatment. The protection and restoration of coral reefs and coastal wetlands should be prioritized over economic interests and short-term economic benefits. Effective reef conservation can also be supported by good regulation practices. Measures to protect key species such as the parrotfish from overfishing, for example, would go a long was to preserving the health of coral reefs. And we now know that the health of those reefs is directly tied to our own. It’s important the health industry—from doctors and patients to scientists and pharmacists—join the call to conserve our coral reefs, natural medicine banks that can help guarantee our rights to a dignified life and a healthy environment.
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Organizations call for support for communities affected by Colombia’s Hidroituango dam
Communities affected by the Hidroituango dam have denounced the murder of two of their members over the past few days. In addition, a recent obstruction in one of the dam’s tunnels means the dam is at risk of overflowing, which could cause an avalanche of mud and debris. Allies are calling on authorities to investigate the harms to local communities and provide adequate support for those affected. Two members of Movimiento Ríos Vivos Antioquia, the coalition of communities affected by Colombia’s Hidroituango Dam, have been murdered in the last several days. Hugo Albeiro George Pérez and Luis Alberto Torres Montoya were murdered on May 2 and 8, respectively, according to statements from Ríos Vivos. Members of the movement have also suffered threats, intimidation, and human rights violations due to their defense of their land and the Cauca River. At the same time, residents of towns downstream from the dam are living in fear and uncertainty this week, faced with a potential environmental catastrophe. The imminent danger is caused by an obstruction in one of the dam’s diversion tunnels that, by interrupting the flow of the Cauca River, could cause the dam to overflow with such force that it would release not just water but an avalanche of mud and debris. The Interamerican Association for Environmental Defense (AIDA), the Center for International Environmental Law (CIEL), and the International Accountability Project (IAP) express our support for Movimiento Ríos Vivos of Antioquia and the communities affected by the Hidroituango Dam in Colombia. We demand that Colombia’s environmental authorities find and punish those responsible for the murders, as well as investigate the ongoing damages caused by the dam’s construction. We also call on the national government to promptly and adequately provide support for affected families. Hidroituango, expected to become Colombia’s largest dam, will affect 12 municipalities, changing the lives of thousand of families that depend directly on the river. The project has received funding from IDB Invest, the private-sector branch of the Inter-American Development Bank. Press contact: Víctor Quintanilla, AIDA, +521 5570522107, [email protected]
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Organizations call for support for communities affected by Colombia’s Hidroituango dam
Communities affected by the Hidroituango dam have denounced the murder of two of their members over the past few days. In addition, a recent obstruction in one of the dam’s tunnels means the dam is at risk of overflowing, which could cause an avalanche of mud and debris. Allies are calling on authorities to investigate the harms to local communities and provide adequate support for those affected. Two members of Movimiento Ríos Vivos Antioquia, the coalition of communities affected by Colombia’s Hidroituango Dam, have been murdered in the last several days. Hugo Albeiro George Pérez and Luis Alberto Torres Montoya were murdered on May 2 and 8, respectively, according to statements from Ríos Vivos. Members of the movement have also suffered threats, intimidation, and human rights violations due to their defense of their land and the Cauca River. At the same time, residents of towns downstream from the dam are living in fear and uncertainty this week, faced with a potential environmental catastrophe. The imminent danger is caused by an obstruction in one of the dam’s diversion tunnels that, by interrupting the flow of the Cauca River, could cause the dam to overflow with such force that it would release not just water but an avalanche of mud and debris. The Interamerican Association for Environmental Defense (AIDA), the Center for International Environmental Law (CIEL), and the International Accountability Project (IAP) express our support for Movimiento Ríos Vivos of Antioquia and the communities affected by the Hidroituango Dam in Colombia. We demand that Colombia’s environmental authorities find and punish those responsible for the murders, as well as investigate the ongoing damages caused by the dam’s construction. We also call on the national government to promptly and adequately provide support for affected families. Hidroituango, expected to become Colombia’s largest dam, will affect 12 municipalities, changing the lives of thousand of families that depend directly on the river. The project has received funding from IDB Invest, the private-sector branch of the Inter-American Development Bank. Press contact: Víctor Quintanilla, AIDA, +521 5570522107, [email protected]
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