Overview
| Stage | Residual leach |
| Mine Type | Open Pit |
| Commodities |
|
| Production Start | ...  |
Lone Tree is a past-producing mine with historic production of approximately 4.2 million ounces of gold and is host to substantial processing infrastructure including a whole-ore autoclave, leach pad and CIC circuit, and a floatation circuit.
Status: Plant Refurbishment. Active Heap Leach Pad
April 3, 2023 - i-80 Gold Corp. has completed an initial cost estimate at a pre-feasibility level and schedule study for recommissioning of the Lone Tree Autoclave facility. The project teams are now advancing a Class III Engineering Study to further refine the refurbishment plan to provide sufficient enough detail for potential future project financing. The final Hatch report is expected to be completed in 2023.
i-80 Gold Corp. continues permitting for the development of the Buffalo Mountain open pit where gold mineralization is expected to be processed at the Lone Tree leach pad facility. |
| Latest News | i-80 Gold Provides Comprehensive 2023 Exploration & Development Update April 3, 2023 |
Source:
p. 9,
Pursuant to the Exchange Agreement, the Corporation acquired a 100% interest in the Lone Tree Project from Nevada Gold in exchange for: (i) Dee LLC's 40% ownership interest in the South Arturo Mine, (ii) assignment of Au Reka's option to acquire the adjacent Rodeo Creek Property; (iii) contingent consideration of up to US$50 million based on production from the Lone Tree mine (as described below); and (iv) arrangement of substitute bonding (and release of Nevada Gold bonds) in respect of the Lone Tree and Buffalo Mountain reclamation obligations at closing. The Corporation's interest in the Lone Tree Project is held through its subsidiary, Dee LLC.
Contractors
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Deposit Type
- Sediment-hosted
- Epithermal
- Mesothermal
Summary:
The Lone Tree deposit is characterized as a pluton-related or distal-disseminated Ag-Au deposit. The Lone Tree deposit among others in the Battle Mountain district appears to be related genetically to porphyry systems, even though many deposits do not contain obvious near-surface features that would indicate this connection, mainly because the gold-silver mineralization in these deposits may be over one km away from the causative intrusions. This is why the deposit has been characterized as both “distal disseminated” (to intrusive center). Due to complex tectonic and extension in the region, the mineralization in these deposit types may have substantially different geometric relations to the intrusive centers and hosted in different stratigraphic horizons. The mineralization at Lone Tree occurs in intensely fractured three stratigraphic horizons which is similar in other deposits in the region; however, it is not the same in all deposits. Gold is associated with low Ag:Au (<2:1), As, Sb, Hg and Tl as well as elevated Bi, Mo and W. Gold is hosted in arsenopyrite indicating higher temperatures of ore formation in comparison to typical Carlin-type deposits where gold is hosted in arsenian pyrite.
Gold mineralization occurs as sub-micron sized inclusions within a distinct generation of very fine-grained pyrite and arsenopyrite in the sulfide zone. Evidence gathered to date suggests that the main gold deposition event occurred in a temperature range of 200° to 450° (epi ........
Summary:
The Lone Tree has been historically mined using surface mining method. A surface mining method is expected. However, a detailed mining plan has not been developed.
Source:
Summary:
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Production:
The Lone Tree Project recovered a total of 1,526 ounces of gold on carbon from residual heap leach operations during the period from October 14, 2021, being the closing date of the Asset Exchange, to December 31, 2021.
| Commodity | Units | 2020 | 2019 | 2018 |
|
Gold
|
oz
| ...... | ...... | 24,253 |
|
Silver
|
oz
| ...... | | |
All production numbers are expressed as metal in doré.
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Reserves at July 31, 2021:
Estimated Resources at 0.65 g/t Cut-Off Grade.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Indicated
|
7.2 Mt
|
Gold
|
1.77 g/t
|
410 koz
|
|
Inferred
|
50.7 Mt
|
Gold
|
1.69 g/t
|
2,764 koz
|
Heavy Mobile Equipment as of December 31, 2018:
| HME Type | Quantity |
|
Truck (haul)
|
.......................
|
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