Pumpkin Hollow Mineral Resources
Open Pit Mineral Resources
The current mineral resource estimate for the open pit was disclosed April 16, 2019 and the related NI 43-101 Technical Report was filed on SEDAR in April 16, 2019, with an effective date of January 21, 2019 .
The Mineral Resource estimate1 used as the basis for the Open Pit PFS is summarized below. Mineral Resources are subdivided into classes of Measured, Indicated and Inferred, with the level of confidence reducing with each class respectively. Mineral Resources are reported as in situ tonnage and are not adjusted for mining losses or mining recovery. The Mineral Resources reported are inclusive of those reported in Mineral Reserves. The reader is cautioned that Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Average Ore Grades
Measured Mineral Resources
Indicated Mineral Resources
Measured and Indicated Mineral Resources
Note: Effective date of Open Pit Mineral Resource is January 21, 2019.
Average Ore Grades
Inferred Mineral Resources
CIM industry best practices were followed in the development of Mineral Resources:
- Totals may not total due to rounding.
- Cu Eq. calculated Mineral Resources were estimated at a cutoff grade of 0.12% Cu
- Resources were contained within a pit shell produced using a Cu price of $3.75/lb, Au $1,343/Troy Oz and Ag at $19.86/ Troy Oz
- Includes North, South and South-East deposits.
- Excludes materials that are oxidized, transition or volcanics.
- Columns using prices / recoveries: Cu $3.20/lb & 89.3%; Au $1,325/Oz & 67.3%; and Ag $20.01/Oz & 56.3%.
Source: Nevada Copper Pumpkin Hollow Project NI 43-101 Technical report: Pumpkin Hollow Development Options – pre-feasibility Study 5,000 tons/day Underground Project; Feasibility Study for a 70,000 tons/day Open Pit /Underground Project, amended report date of January 3, 2018.
Underground Mineral Resources
The Underground Mineral Resource estimate was prepared by Tetra Tech and included in a technical report titled ‘NI 43-101 Technical Report Integrated Feasibility Study Pumpkin Hollow Project Yerington, Nevada’ with an effective date for the Underground Mineral Resource of April 15, 2015. The Underground Mineral Resource estimate was based on the results of all drilling up to the end of 2013. The 2015 and 2018 drilling has not been used to modify the current Mineral Resource estimate. Tetra Tech confirmed that there has been no material change in the current Mineral Resources estimate based on these drilling results. In addition, there has been no change in sampling protocols including drilling, sample preparation, analytical method, verification and security measures. On this basis, Tetra Tech has deemed that no revision to the current Mineral Resource estimate is required. Mineral Resources are subdivided into classes of Measured Resources, Indicated Resources and Inferred Resources, with the level of confidence reducing with each class, respectively. Mineral Resources are reported as in situ tonnage and are not adjusted for mining losses or mining recovery. The Mineral Resources reported are inclusive of Mineral Reserves. In addition to cutoff grade, the Underground Mineral Resources have been limited to the 0.5% Cu mineralized shell interpretation. The reader is cautioned that Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Mineral Resource Underground Eastern Area
Cutoff Grade %/Cu
Contained Cu lb (millions)
|Grade Au oz/st|
Contained Au ozs (thousands)
Grade Ag oz/st
Contained Ag ozs (thousands)
Contained Fe tons (millions)
Measured + Indicated
Notes: Includes East and E2 deposts
Measured and Indicated Resources are stated as inclusive of reserves
Columns may not total due to rounding
Resources are constrained by a 0.5% Cu mineralized interpretation
Effetive date on Underground Mineral Resource is April 15, 2015