Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Processing |
- Heap leach
- Carbon adsorption
- Cyanide (reagent)
|
| Mine Life | 17 years (as of Jan 1, 2017) |
In September 2018 Nordgold’s new Russian flagship Gross mine was officially launched. |
Source:
p. 75
Summary:
The Gross deposit is hosted within shallowly dipping lower Proterozoic sandstones lying unconformably over Archaean gneisses and schists. The sandstones have been subjected to broad scale metasomatism with associated potassic alteration. Gold and silver mineralisation is associated with this metasomatism. The principal tectonic features in the area consist of a set of N-S striking, steeply dipping faults, a NE – SW striking and steeply dipping shear zone and a shallow thrust of E-W strike, dipping to the south at 20-30°.
The Gross deposit consists of low grade disseminated gold and silver mineralisation associated with the metasomatically altered sandstone sequences. The mineralised sequence is typically between 20m to 200m thick striking approximately east-west and dipping at a shallow 30° to the south. Mineralisation remains open along strike and down dip.
Summary:
Mine Type: Classical single open pit mine with average throughput of 12.0Mtpa and average stripping ratio of 3.25t/t.
Processing Technologies
- Heap leach
- Carbon adsorption
- Cyanide (reagent)
Summary:
Processing Type: Heap leach processing technology for low grade ore.
- ore crushing: Two stage crushing to -65mm and -40mm, 2000tph
- ore transportation: 5km conveyors from crusher to leach pad and to ore dump
- leaching process: Steam heated cyanide solution, absorption to activated carbon
- recovery: 82.50%
Recoveries & Grades:
| Commodity | Parameter | Avg. LOM |
|
Gold
|
Recovery Rate, %
| 82.5 |
Production:
| Commodity | Units | 2018 | Avg. Annual (Projected) |
|
Gold
|
koz
| ......  * | 230 |
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Operational Metrics:
| Metrics | |
|
Stripping / waste ratio
| 3.25 * |
|
Annual mining capacity
| 12 Mt of ore * |
* According to 2014 study.
Reserves at December 31, 2017:
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
Total
|
8,498 kt
|
Gold
|
0.56 g/t
|
152 koz
|
|
Probable
|
Total
|
181,318 kt
|
Gold
|
0.73 g/t
|
4,256 koz
|
|
Proven & Probable
|
Total
|
189,816 kt
|
Gold
|
0.72 g/t
|
4,408 koz
|
|
Measured
|
Stockpiles
|
3,749 kt
|
Gold
|
0.33 g/t
|
39 koz
|
|
Measured
|
In-Situ (OP)
|
7,784 kt
|
Gold
|
0.69 g/t
|
172 koz
|
|
Indicated
|
In-Situ (OP)
|
374,496 kt
|
Gold
|
0.67 g/t
|
7,910 koz
|
|
Measured & Indicated
|
Total
|
386,029 kt
|
Gold
|
0.68 g/t
|
8,121 koz
|
|
Inferred
|
In-Situ (OP)
|
78,618 kt
|
Gold
|
0.64 g/t
|
1,619 koz
|
|
Total Resource
|
Total
|
464,647 kt
|
Gold
|
0.67 g/t
|
9,740 koz
|
Commodity Production Costs:
| | Commodity | Units | Average |
|
Total cash costs
|
Gold
|
USD
|
679 / oz *
|
|
All-in sustaining costs (AISC)
|
Gold
|
USD
|
760 / oz *
|
|
Assumed price
|
Gold
|
USD
|
1,250 / oz *
|
* According to 2014 study / presentation.
Financials:
| | Units | 2018 | 2017 |
|
Capital expenditures
|
M USD
| ......  | ...... |
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2014 Study Costs and Valuation Metrics :
| Metrics | Units | LOM Total |
|
Pre-Production capital costs
|
$M USD
|
...... 
|
|
Ater-tax IRR, %
|
|
......
|
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Staff:
| Employees | Year |
|
|
2018
|
Aerial view:
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