In 2011, Dumas commenced work on the Roberto Letts shaft at Andaychagua Mine, Peru.
Work included 447m of excavation with rubble removal, fortification, and 283m of internal shaft excavation. Additional activities included workstation rehabilitation, shaft collar construction, hoisting system installation, shaft lining, and assembly.
Scope of Work
- 447m shaft excavation, 283m internal excavation
- Shaft collar, Galloway installation, shaft hoisting system
- Shaft furnishings, lining, and assembly
