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Beneficial Uses of Chat Proposed

Fact Sheet

March 2006


The Environmental Protection Agency (EPA) is encouraging the safe and beneficial use of chat from the Oklahoma, Missouri and Kansas tri-state mining district. Beneficially using chat will reduce the current health and environmental hazards posed by existing surface-level chat piles.


EPA is proposing criteria for the beneficial use of chat from the tri-state mining district in transportation construction projects and in non-transportation, nonresidential concrete and cement projects. EPA believes the proposed uses of chat are protective of human health and the environment. The proposed criteria involve safely encapsulating chat particles in asphalt or cement and concrete.

Chat is a gravel-like waste created from lead and zinc mining activities in the Oklahoma, Kansas and Missouri tri-state district between the late 1800s and mid 1900s. Currently about 100 million tons of chat contaminated with lead, zinc and cadmium are located in the tri-state mining district. The district covers approximately 2,500 square miles and includes parts of Ottawa County, Oklahoma; Cherokee County, Kansas; and Jasper and Newton Counties, Missouri.

Beneficially using chat according to the proposed criteria will both reduce chat piles and improve human health and the environment in the tri-state area. EPA is proposing these criteria in response to the Safe, Accountable, Flexible, and Efficient Transportation Equity Act of 2005. Exit EPA

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