In 2015, Tetra Tech completed NI 43-101 compliant Mineral Resource and Mineral Reserve Estimates:
| 2015 Mineral Resource Estimate | |
| Measured & Indicated | 5.64Mt @ 1.01% Ni |
| Inferred | 0.36Mt @ 0.84% Ni |
| Total | 6.08Mt @ 1.01% Ni |
| 2015 Mineral Reserve Estimate | |
| Proven | 4.1Mt @ 0.96% Ni 571,000 tonnes contained nickel |