Overview
| Stage | Residual leach |
| Mine Type | Open Pit |
| Commodities |
|
| Processing |
- Crush-and-stack plant
- Heap leach
- Carbon in column (CIC)
- Carbon adsorption-desorption-recovery (ADR)
- Cyanide (reagent)
|
| Production Start | ...  |
| Mine Life | 2022 |
Open pit mining at Ruby Hill is now concluded with leaching to continue into 2022 and the Company is in the process of advancing permitting for an underground operation, including the construction of a decline from the bottom of the current Archimedes pit. |
| Latest News | i-80 Gold Expands High-Grade Gold Mineralization at Ruby Hill November 29, 2022 |
Source:
p. 9,20
On September 3, 2021, the Corporation, together with Premier USA, entered into a membership interest purchase agreement with affiliates of Waterton (the "Ruby Hill Acquisition Agreement"), pursuant to which Premier USA agreed to acquire from Waterton all of the outstanding membership interests of Ruby Hill LLC, the 100% owner of the Ruby Hill Project (the "Ruby Hill Acquisition"). The Ruby Hill Acquisition closed on October 15, 2021, and upon closing thereof, Ruby LLC became an indirect, wholly-owned subsidiary of the Corporation.
Contractors
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Deposit Type
- Carlin-type
- Intrusion related
- Skarn
- Carbonate replacement
Summary:
The Ruby Hill Project is located along the southeastern end of the Battle Mountain/Eureka gold trend. The Eureka gold mining district exposes a nearly continuous sequence of Cambrian and Ordovician sedimentary rocks approximately 10,000' thick consisting of primarily carbonate units with subordinate shale and quartz sandstone.
Mineralization at Ruby Hill is characterized by early polymetallic, intrusive-related carbonate replacement and skarn deposits that have been overprinted by younger Carlin-type precious metal mineralization.
Within the Property area, two styles of mineralization occur:
• Early polymetallic (Au-Ag-Pb-Zn) skarn or carbonate replacement deposit (CRD): Blackjack and TL).
• Late Au±Ag Carlin-type: East Archimedes, West Archimedes, 426, Ruby Deeps, Mineral Point zones.
The polymetallic skarn and CRD style is the oldest mineralization event recognized at the Property and related to emplacement of the Cretaceous intrusive units. The precious metal-rich Carlin style overprints the older CRD event and interpreted to have developed during early-middle Cenozoic (Eocene) times, similar to other Au-Ag deposits of the Battle Mountain/Eureka Trend. Mineralization is largely controlled by lithology and structure.
Gold-silver mineralization occurs broadly as a near N-trending zone (Mineral Point Trend), consisting of smaller zones of structurally and lithologically controlled deposits (East and West Archimedes, 426, ........
Summary:
The West Archimedes deposit of the Ruby Hill Gold Mine is developed by an open pit in an area previously mined for polymetallic deposits by underground methods. A mill, haul roads, leach pads, and waste dumps are also present on the property.
Processing
- Crush-and-stack plant
- Heap leach
- Carbon in column (CIC)
- Carbon adsorption-desorption-recovery (ADR)
- Cyanide (reagent)
Source:
Summary:
The Ruby Hill operation consists of an open pit mine, two waste rock facilities, a two-stage crushing system, a ball mill (inactive), thickener (inactive), belt filters (inactive), ore conveying and stacking system, a multi-cell heap leach facility, a pregnant solution tank and overflow pond, two storm water ponds, an Adsorption-Desorption-Recovery (ADR) Plant, a precious metals refinery, associated interconnected pipelines, and support buildings.
Open pit mining at Ruby Hill is now concluded with leaching to continue into 2022.
Recoveries & Grades:
| Commodity | Parameter | 2014 |
|
Gold
|
Head Grade, g/t
| 2.58 |
Production:
The Company acquired a 100% indirect ownership interest in Ruby Hill on October 18, 2021, pursuant to the Ruby Hill Acquisition. The Ruby Hill Project recovered a total of 1,469 ounces of gold on carbon during the period from October 15, 2021, being the closing date of the Ruby Hill Acquisition, to December 31, 2021.
| Commodity | Units | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Gold
|
koz
| ...... | ...... | 4.6 | 3.4 | 6.5 | 10 | 33 |
|
Silver
|
oz
| ...... | ...... | ...... | ...... | ...... | | |
All production numbers are expressed as metal in doré.
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Operational Metrics:
| Metrics | 2014 | 2013 |
|
Tonnes milled
| 106 kt | 2,019 kt |
|
Total tonnes mined
| | 12,803 kt |
Reserves at July 31, 2021:
Open Pit Mineral resources are shown above a 0.1 g/t Au cut-off grade.
Underground Mineral Resources are shown above a 3.6 g/t Au cut-off grade.
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Indicated
|
In-Situ (OP)
|
224.4 Mt
|
Gold
|
0.54 g/t
|
3,874 koz
|
|
Indicated
|
In-Situ (UG)
|
1.2 Mt
|
Gold
|
5.22 g/t
|
202 koz
|
|
Indicated
|
In-Situ (OP)
|
224.4 Mt
|
Silver
|
14.3 g/t
|
103,335 koz
|
|
Indicated
|
In-Situ (UG)
|
1.2 Mt
|
Silver
|
0.6 g/t
|
22 koz
|
|
Inferred
|
In-Situ (OP)
|
162.7 Mt
|
Gold
|
0.39 g/t
|
2,062 koz
|
|
Inferred
|
In-Situ (UG)
|
8.21 Mt
|
Gold
|
6.02 g/t
|
1,588 koz
|
|
Inferred
|
In-Situ (OP)
|
162.7 Mt
|
Silver
|
14 g/t
|
73,472 koz
|
|
Inferred
|
In-Situ (UG)
|
8.21 Mt
|
Silver
|
1.7 g/t
|
439 koz
|
Commodity Production Costs:
| | Commodity | Units | 2015 |
|
Cash costs
|
Gold
|
USD
|
628 / oz
|
|
All-in sustaining costs (AISC)
|
Gold
|
USD
|
696 / oz
|
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