Study may help slay 'Yellow Monster'

Low-grade uranium ore is nicknamed "yellowcake" for its color and powdered consistency. The Navajo have another name: Leetso, or "yellow monster." The yellow monster surfaced on the Navajo Nation with uranium mining that started in the 1940s and continued for the next several decades. In its aftermath came illnesses such as lung cancer among mine workers and worries about environmental contamination among people who live on that land.

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