| 1960s |
Orebody discovered. |
| 1980 – 83 |
Began mining D Pit. |
| 1983 |
D Pit began decommissioning. |
| 1983 – 99 |
Mining of the OP/DP underground mine. |
| 1987 |
Gold extraction circuit is added to the mill to recover gold from the Phase 1 tailings. |
| 1989 – 91 |
DJN Pit mined. |
| 1994 – 97 |
DJX Pit mined. |
| 1994 – 2002 |
Mining of the DJ underground mine. |
| 1998 |
Cluff Lake operation is awarded the John T. Ryan safety award from the Canadian Institute of Mining, Metallurgy and Petroleum for the lowest lost time accident rate of any metal mine in Canada. |
| 2002 |
After 22 successful years, Cluff mining operations cease with a total production of 62 million pounds of U3O8. |
| 2003 |
For the second time, the Cluff Lake operation is awarded the John T. Ryan safety award from the Canadian Institute of Mining, Metallurgy and Petroleum for the lowest lost time accident rate of any metal mine in Canada. |
| 2004 |
Decommissioning license granted and reclamation work begins. Cluff Lake earns ISO 14001 certification. |
| 2006 |
Physical decommissioning complete. |
| 2008 |
800,000 trees planted since 2004. |
| 2009 |
Cluff Lake achieves nine years without a lost-time accident. |
