| 2004 | operating licence renewed, valid until 2008 | |
| 2003 | McArthur River and Key Lake ISO 14001 certified | |
| 2001 | becomes the world's largest high-grade uranium mill, producing 18 million pounds | |
| 2000 | Cameco and long-term contract employees achieved a record three years without a lost-time accident | |
| 2000 | received, with McArthur River, the Canadian Institute of Mining's John T. Ryan trophy for the best safety record for metal mines in Canada in 1999 | |
| 2000 | began milling ore from the McArthur River mine in January 2000 | |
| 1999 | Cameco sold a 16.66% interest to AREVA Resources | |
| 1998 | Cameco acquired the one-third interest held by Uranerz Exploration and Mining Limited | |
| 1997 | mined out Deilmann open pit | |
| 1989 | started mining Deilmann pit | |
| 1989 | added molybdenum removal plant | |
| 1987 | mined out Gaertner open pit | |
| 1984 | added semi-autogenous grinding mill | |
| 1983 | began production | |
| 1976 | discovered Deilmann deposit | |
| 1975 | discovered Gaertner deposit | |
| 1968 | began exploration |