Overview
Stage | Preliminary Economic Assessment |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Mine Life | 26 years (as of Jan 1, 2021) |
This PEA represents an update to the previous technical study completed in 2015 and includes consideration of potential by-products of the REE processing route of nepheline syenite, niobium (Nb) and zirconium (Zr).
This report presents a re-evaluation of the Project to address issues raised after publication of the 2015 PFS report (Davidson et al 2015). The main issues being, the need to increase resource utilization/efficiency, improve environmental and social governance on the project and minimize local footprint by incorporating process improvements and changes in the mining and processing approach. |
Source:
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Tasman Metals AB (“Tasman”) are a 100%-owned subsidiary of LEM and owner of the Project.
Contractors
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Deposit Type
- Intrusion related
- Magmatic
Summary:
The REE and Zr-bearing Norra Kärr deposit is hosted by an alkaline igneous intrusion dominated by various sub-categories of nepheline syenite. The intrusion is termed “agpaitic grennaite” (named after the nearby town of Gränna), which is described as a peralkaline nepheline syenite containing complex and exotic silicate minerals such as eudialyte and rinkite (containing zirconium, titanium, rare earth elements). It is part of the Precambrian age (~1 Ga) Trans Scandinavian Igneous Belt (“TIB”), which comprises a giant elongated array of batholiths extending 1,400 km across Scandinavia from southeast Sweden to northwest Norway. The REE and Zr mineralisation is hosted by the complex
silicate mineral eudialyte. There are minor amounts of secondary REE-bearing britholite and trace mosandrite. The eudialyte at Norra Kärr is relatively rich in REE compared to most other similar deposits and also contains a very high proportion of HREO.
The Norra Kärr complex has been emplaced in a rift setting (Lake Vattern) within the Trans Scandinavian Igneous Belt (“TIB”).
Geologically, the Norra Kärr complex is best defined as a zoned agpaitic, peralkaline, nepheline syenite - similar in many respects to other well-known peralkaline complexes, e.g. Ilimaussaq in Greenland, Dubbo in Australia, Kipawa in Canada and Lovozero on the Kola Peninsula of Russia.
The Norra Kärr intrusive complex is located close (1.52 km) to the eastern shore of Lake Vattern, a larg ........
Summary:
The mine planning work was carried out using a mining model, which was generated from the resource model through a regularization process to a block size of 5 m x 5 m x 5 m. A pit optimization was undertaken with a 260 m exclusion from the highway.
The pit designs have been divided into four stages, with starter pits in both the north and south followed by ultimate pits in both areas which combined to form one final pit. The tonnage and grade differences between the selected shell and pit design are less than 2%. The ultimate pit inventory is 29.3 Mt of mineralized rock and 9.4 Mt of waste for a strip ratio of 0.32. There is one external waste rock storage facility and a backfill storage facility in the north pit to limit external wastestorage.
The ramps exit towards the east where the waste rock storage facility (WRSF) and crusher will be located. The ramps between Stage 3 and 4 are connected at the 151 m level, at which point either ramp exit can be used. The connected ramps will also be used to allow waste from Stage 4 to be backfilled in the Stage 3 pit.Single lane ramps have been used in the lower 50 m of the pits. Within the pit design the average loss is 6.7% and the average dilution is 5.8%.
The waste will be stored in an external Waste Rock Storage Facility (WRSF) and backfilled in the northern part of the pit once that area has been mined. The external WRSF design criteria has a capacity of 8.8 M loose cubic meters. The backfill st ........
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Flow Sheet:
Summary:
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Reserves at August 18, 2021:
Category | Tonnage | Commodity | Grade |
Inferred
|
110 Mt
|
Total Rare Earth Oxides
|
0.5 %
|
Inferred
|
110 Mt
|
ZrO2
|
1.7 %
|
Inferred
|
110 Mt
|
Nb2O5
|
0.05 %
|
Corporate Filings & Presentations:
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