Example - Cigar Lake, Canada

Despite the high grade uranium ore 430 metres underground, there are no signs on the surface of its presence. The ore has been well preserved since its formation.

	The structure of the ore body has many similarities to that of proposed repositories for highly radioactive waste The depth of the deposit The factors controlling the flow and composition of the groundwater The ore is surrounded by clay similar to the backfill around the waste containers
Main reasons for the preservation of the uranium ore deposit: Clay rich rocks surround the ore Deposit groundwater is oxygen poor