# Arsenic Levels at Grand Canyon Uranium Mine Spark Safety Concerns Groundwater tests reveal arsenic concentrations thousands of times above safe drinking water limits. - **Source:** [Science & tech Articles | Mail Online](https://www.dailymail.com?ns_mchannel=rss&ns_campaign=1490&ito=1490) - **Published:** 2026-11-07 - **Topic:** [climate](https://brifing.si/c/climate) - **Original article:** - **On Brifing:** https://brifing.si/s/43d68f52-6e86-4a95-a1c3-46915bcece0d ## Toxic Arsenic Levels Detected Monitoring wells at the Pinyon Plain uranium mine near the Grand Canyon show arsenic levels up to six times the EPA's safe limit. Furthermore, internal company reports indicate that water at the bottom of the mine shaft contains arsenic concentrations exceeding the safe drinking water threshold by more than 3,000 times. ## Mining Operations and Groundwater Since 2016, the Pinyon Plain mine has pumped tens of millions of gallons of groundwater from deep shafts to facilitate operations. Scientists warn that this process may be fracturing rock layers, allowing oxygen to interact with minerals and release high concentrations of naturally occurring arsenic into the surrounding regional aquifer system. ## Scientific Dispute Over Origins Energy Fuels Resources Inc maintains that the arsenic is naturally occurring and that their pumping merely draws in existing mineral-rich water. However, hydrologist David Kreamer argues that arsenic levels outside the mine are 20 to 30 times lower, suggesting the mine's activities are actively worsening the contamination within the site. ## Regulatory Stance and Controversy The Arizona Department of Environmental Quality supports the mining company, stating that the mine creates a hydraulic sink that prevents pollution from spreading. They claim the company manages water in a closed system, yet critics argue that this regulatory approval was granted without sufficient independent investigation into the rising arsenic trends. ## Threat to Havasupai Tribe The Havasupai Tribe, residing in Supai Village, relies on Havasu Creek as their sole water source. Concerns persist that contaminated groundwater could reach Havasu Spring, which feeds the creek. If this water source becomes tainted, the tribe would face a critical loss of supply for drinking, farming, and daily survival. ## Ecological Risks to Park The Grand Canyon National Park faces potential ecological damage if toxic levels of arsenic reach springs on the south rim. Independent researchers emphasize that the connectivity between the Coconino and Redwall-Muav aquifers could facilitate the spread of contaminants, threatening both the park's natural ecosystems and the water sources used by visitors. ## Historical Data Analysis The Grand Canyon Trust analyzed 32 years of groundwater data collected between 1993 and 2025 from 40 different wells. Their findings highlight a significant discrepancy between the mine's internal explanations and the observed increase in arsenic concentrations, which have risen steadily since the commencement of intensive pumping operations at the site. ## Future Monitoring Requirements As the debate continues, experts call for more rigorous, independent hydrogeological studies to determine the exact cause of the rising arsenic levels. The conflict underscores the tension between industrial resource extraction and the protection of vital water resources in sensitive regions, highlighting the need for transparent, data-driven environmental oversight moving forward. ## Sources covering this story - https://www.dailymail.com/sciencetech/article-16252559/grand-canyon-arsenic-uranium-arizona.html?ns_mchannel=rss&ns_campaign=1490&ito=1490 — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._