Mining of uranium and thorium ores

This class includes:

• mining of ores chiefly valued for uranium and thorium content: pitchblende, etc.
• concentration of such ores
• manufacture of yellowcake

This class excludes:

• enrichment of uranium and thorium ores, see 20.13
• production of uranium metal from pitchblende or other ores, see 24.46
• smelting and refining of uranium, see 24.46