| 1956 | Pre-Graduation, Trail |
| Smelter work Miner trainer |
|
| 1956 - 1957 | Britannia Mines |
| Miner Surveyor Shaft engineer |
|
| 1957 - 1960 | Denison Mines |
| Mine captain | |
| 1960 - 1966 | Inco Limited |
| Chief mines planning engineer, Manitoba Division | |
| 1966 - 1969 | Denison Mines |
| Assistant General Manager and Executive Assistant to COO, Director and V.P., Various Cos | |
| 1969 - 1972 | Inco Limited |
| Vice President, Operations, Inco Australia and P.T. Inco Indonesia | |
| 1972 - 1975 | Tara Mines Limited |
| Vice President and General Manager | |
| 1975 - 1985 | Denison Mines |
| President and COO, Chairman Various Cos | |
| 1985 - 1994 | Curragh Resources Company |
| Founder, Chairman and CEO, Chairman Various Cos | |
| 1995 - 2001 | Director and Private Mining Consultant |
| Chairman Various Cos | |
| 2002 - 2007 | Founder, Chairman |
| Various Cos |
1957 - 1960 Denison Mines
In
late 1957, Denison Mines was being developed as the world's largest
underground trackless uranium mine.
Cliff spent the first of his three periods with Denison Mines in 1957
starting as a Mine Shift Boss. At 24 years old, he rose to the rank of Mine
Captain, one of the youngest mine captain's to date in Ontario. In Cliff's
first tenure with Denison, he was exposed to the operation and development
of new machinery for the mine and the training of completely green
personnel. For him, Denison represented the first climb to upper management.