C4.Inside the Key Lake Mill. This mill concentrates uranium ore from the Key Lake mine. Through a series of chemical leaching processes, crushed ore is transformed into a fine uranium oxide powder called yellowcake. Most of the radioactive rock entering the mill leaves as a sandy waste that still contains 85% of the ore's original radioactivity. Key Lake Open Pit Mine, Northern Saskatchewan, Canada. 17 September 1986.

These photographs by Robert Del Tredici are protected by copyright and are available for purchase as high-quality digital prints on archival paper or as silver gelatin prints from bdeltredici@hotmail.com.