Overview
| Stage | Permitting |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Mine Life | 20 years (as of Jan 1, 2022) |
Source:
p. 48
GRI has applied to Mineral License and Safety Authority (MLSA) for the transfer of ownership of License No.2018/11 to a wholly owned Greenland-based subsidiary, GRI A/S. The purpose for the transfer is to fulfill a legal requirement for conversion of the MEL to an Exploitation Licence. At the time of writing, the transfer request was awaiting approval from MLSA.
Contractors
- Subscription is required.
Deposit Type
- Porphyry
- Hydrothermal
- Intrusion related
- Breccia pipe / Stockwork
Summary:
Malmbjerg is a porphyry molybdenum Project similar in style and morphology to the Climax Project, in Colorado, USA. Projects of this type are typically large, measuring in the hundreds of millions of tonnes with molybdenite (MoS2) contents typically measuring less than 1% of the rock by weight. Late hydrothermal processes related to the intrusions were responsible for alteration and deposition of molybdenum sulphide mineralization.
The mineralization occurs as a diffuse zone of molybdenite (± accessory tungsten) in fractures and stockworks in both the intrusives and sandstones. Molybdenite occurs as fracture-fillings and disseminations in association with hydrothermal alteration. The Project is broadly dome shaped with an outside diameter of up to 600 m and a height of approximately 150 m.
Host rocks for the Malmbjerg Project comprise Mid-Tertiary alkalic leuco-granite stocks and clastic sedimentary rocks of the Lower Permian Rode Group. The sedimentary rocks are primarily arkosic and conglomeratic sandstones that have been variously hornfelsed. Intrusive rocks consist of four principal phases: perthite granite, quartz porphyry (Arcturus porphyry), porphyritic aplite, and weakly feldspathic quartz porphyry (Schuchert porphyry). In the western cliff face of Høstakken Mountain, the intrusive/sediment contact is plainly visible, forming a broad arch with the Rode Group rocks draped over top.
Contact relationships within the intrusion are comple ........
Summary:
The Malmbjerg Molybdenum Project comprises of a conventional open pit mine producing 35,000 t/d of Mo rich ore for processing in a conventional base metal sulphide concentrator. The mine plan equipment fleet consists of two x 34 m3 hydraulic shovels loading 13 x 230 t haul trucks operating on 12 m benches. The operational mining plan will utilize an economic grade control system where higher value ore will be separated and transported to the concentrator while the lower value ore will be stockpiled and processed at the end of conventional mining. Waste rock will be stored on the west side of the deposit and used for haul road and construction activities at the mine site. Current mining reserves dictate a mine life of 20 years where the concentrator will be fed directly from the open pit for a period of 11 years, and stockpiled ore will be processed for the remaining 9 years.
Two-way in-pit haul roads of 32 m widths are designed to support the use of 230-t payload haul trucks. Haul road grades are limited to a maximum of 8%. Access ramps are not designed for the last bench above the pit bottom elevation, assuming that the ramp segment accessing the pit bottom will be removed using retreat mining. The bottom two ramped benches of the pit use one-way haul roads of
23 m width and 12% grade since bench volumes and traffic flow are reduced.
Ultimate pit limits are split into phases or pushbacks to target higher economic material earlier in the mine life w ........
Source:
- subscription is required.
Flow Sheet:
Summary:
- subscription is required.
Reserves at February 8, 2022:
Mineral Reserves are reported at a cut-off NSR of $11.14/t NSR (diluted). The cut-off value covers the processing + G&A costs of $8.34/t, ore transport costs of $0.14/t, and stockpile rehandle costs of $1.25/t.
Mineral Resource base case cut-off grade within the “reasonable prospects of eventual economic extraction” constraining pit is an MoS2 grade of 0.08% which corresponds to a Net Smelter Return (NSR) of $14.79/t.
Conversion from MoS2 to Mo is 0.599 based on the respective atomic weights.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
123 Mt
|
Molybdenum
|
0.121 %
|
328 M lbs
|
|
Probable
|
122 Mt
|
Molybdenum
|
0.09 %
|
243 M lbs
|
|
Proven & Probable
|
245 Mt
|
Molybdenum
|
0.1 %
|
571 M lbs
|
|
Measured
|
128 Mt
|
Molybdenum
|
0.12 %
|
345 M lbs
|
|
Indicated
|
153 Mt
|
Molybdenum
|
0.1 %
|
317 M lbs
|
|
Measured & Indicated
|
281 Mt
|
Molybdenum
|
0.11 %
|
661 M lbs
|
|
Inferred
|
33 Mt
|
Molybdenum
|
0.06 %
|
42 M lbs
|
| Type | Material | Diameter | Length | Description |
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.