- 100 year: Copper Mines of Tasmania (Mount Lyell Mining).
- 60 year: Ensign International Energy Services
- 50 year: Chevron Australia
- 45 year: Grange Resources
- 45 year: Svitzer Australia
- 35 year: Thiess
- 30 year: Clough
- 30 year: St Barbara
- 25 year: Sodexo Services Australia
- 20 year: Nacap Australia
- 20 year: Gold Fields Australia
- 20 year: Fluor Australia
- 20 year: Brunel Technical
- 15 year: Fortescue Metals Group
- 15 year: BP Refinery – Kwinana
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