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Sweden
Bjorkdal Mine

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 Location:
28 km NW from Skelleftea, Sweden

  Address:
Björkdalsgruvan 1
Kåge
Sweden
934 94
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • On vein development (OVD)
  • Longhole stoping
  • Backfill
Production Start...
Mine Life2031
In 2019, the open pit mining operations at the Bjorkdal mine were stopped for economic reasons and this mill feed was replaced with ore from the low grade stockpile and an increase in underground production. As presently envisaged in the LOM plan, open pit pre-stripping and production will be restarted in 2026 to supplement the decrease in production from the underground mine.


Owners

Source: p. 22
CompanyInterestOwnership
Mandalay Resources Corp. 100 % Indirect
Mandalay holds 100% of Björkdal through the Swedish registered companies Björkdalsgruvan AB and Björkdal Exploration AB.

Contractors

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Deposit Type

  • Skarn
  • Vein / narrow vein
  • Mesothermal


Summary:

The Björkdal Property, containing both the Björkdal mine and the Norrberget deposit.

Deposit Type
Björkdal
The predominant source of ore at Björkdal is contained in a package of anastomosing, sheeted quartzveins. This epigenetic vein network appears to be structurally controlled and consists of more than one thousand sub-parallel quartz veins that typically strike 030° to 090° from true-north. Such strong structural-geological influences over geometry of any quartz vein hosted mineralisation clearly suggests a strong spatial and temporal relationship with orogenic/tectonic processes (i.e., mesothermal/greenstone gold systems). In contrast, the mineral associations with gold mineralisation, and the large alteration signature of the Björkdal area, could alternatively suggest that host depositional mechanisms are responsible for the mineralisation at Björkdal as there are some similarities with skarn and/or porphyry systems.

A much smaller, yet prolific source of ore at Björkdal is observed in strongly altered lenses of skarn. Skarnification occurs commonly within the Mine, especially in the limestone/marble unit where it occurs as discreet patches and lenses, these lenses typically measure 200 m to 400 m along strike, 100 m to 200 m down dip and are usually no more than 10 m thick. However, similar calc-silicate alteration has taken place in areas where local shearing has affected the volcanoclastic host rock. The altered rock texture appears sh ........


Mining Methods

  • On vein development (OVD)
  • Longhole stoping
  • Backfill


Summary:

The current environmental permit limits the total Björkdal production capacity to 1.70 Mtpa. Prior to 2020, production was split between the underground mine and the open pit. In 2019, mining of the open pit was stopped for economic reasons and this mill feed was replaced with ore from the low grade stockpile and an increase in underground production.

The remaining open pit material remains economically viable, however, the low grade stockpile realizes more value, so open pit mining has been deferred for several years until the stockpile has been run-down and open pit production is required to offset reducing underground production.

As presently envisaged in the LOM plan, open pit pre-stripping and production will be restarted in 2026 to supplement the decrease in production from the underground mine.

Björkdal
Open Pit
Mine Design
During 2022, potential for expanding the current open pit at Björkdal was re-evaluated. Benches will be 5 m high, and are taken in groups of two to four with an 8 m to 10 m wide berm every 10 m to 20 m. A 72° to 85° bench face angle (BFA) is used to give an overall wall slope of 42° to 52°.

Mining Method
The open pit has currently been halted and is planned to be restarted in 2026, however, this could be delayed further in the event of additional underground reserves being identified. The planned mining method is standard truck and shovel mining, as was done historically. Details will b ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits2023202220212020201920182017
Gold Payable metal koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required4662
Gold Concentrate kt  ......  Subscription required2.54.5
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202320222021202020192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,066,443 t1,155,751 t871,625 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required1,319,620 t1,261,604 t1,251,453 t
Daily processing rate  ......  Subscription required  ......  Subscription required  ......  Subscription required3,600 t3,400 t3,400 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required3,700 t3,700 t3,700 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1.32 Mt
^ Guidance / Forecast.
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Reserves at December 31, 2022:
Open pit Mineral Resources are estimated at a cut-off grade of 0.36 g/t Au for Björkdal and 0.42 g/t Au for Norrberget. Underground Mineral Resources are estimated at a cut-off grade of 0.82 g/t Au.

Open Pit Mineral Reserves for Björkdal are based on mine designs carried out on an updated resource model, applying a block dilution of 100% at 0.0 g/t Au for blocks above 1.0 g/t and 100% at in-situ grade for blocks below 1.0 g/t, but above a cut-off grade of 0.39 g/t Au. Open Pit Mineral Reserves for Norrberget are based on 15% dilution at 0.0 g/t Au and a cut-off grade of 0.46 g/t Au. For underground Mineral Reserves a cut-off grade of 1.00 g/t Au was applied to material mined within stopes. An incremental cut-off grade of 0.46 g/t Au was used for development material.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (UG) 661 kt Gold 1.61 g/t 34 koz
Probable Stockpiles 2,357 kt Gold 0.6 g/t 45 koz
Probable In-Situ (OP) 2,986 kt Gold 1.21 g/t 116 koz
Probable In-Situ (UG) 5,617 kt Gold 2.1 g/t 379 koz
Probable Total 10,960 kt Gold 1.53 g/t 540 koz
Proven & Probable Total 11,622 kt Gold 1.54 g/t 574 koz
Measured In-Situ (UG) 526 kt Gold 2.39 g/t 40 koz
Indicated Stockpiles 2,357 kt Gold 0.6 g/t 45 koz
Indicated In-Situ (OP) 2,724 kt Gold 2.35 g/t 206 koz
Indicated In-Situ (UG) 11,084 kt Gold 2.6 g/t 926 koz
Indicated Total 16,165 kt Gold 2.27 g/t 1,177 koz
Inferred In-Situ (OP) 3,040 kt Gold 1.46 g/t 143 koz
Inferred In-Situ (UG) 1,815 kt Gold 2.1 g/t 123 koz
Inferred Total 4,855 kt Gold 1.7 g/t 265 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,159 / oz   816 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in costs Gold USD  ......  Subscription required 1,452 / oz   1,083 / oz  
^ Guidance / Forecast.
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Operating Costs:

Units20222021202020192018201720162015
UG mining costs ($/t milled) USD 26.4  26  22.4  
Combined mining costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 27.9   26  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 64.1   74.3  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -7.1   6.3  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -4.7   5  
EBIT M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -5.1  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.2   26.2  
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Water Supply
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Heavy Mobile Equipment as of December 31, 2022:
HME TypeModelQuantityLeased or
Contractor
Bolter ....................... Subscription required ....................... Subscription required
Bolter ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Explosives Charger ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required
Scaler ....................... Subscription required ....................... Subscription required
Scaler ....................... Subscription required ....................... Subscription required
Shotcreter ....................... Subscription required ....................... Subscription required
Shotcreter ....................... Subscription required ....................... Subscription required
Trans Mixer ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2023
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Annual Information Form 2022
Management Discussion & Analysis 2022
Other 2022
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Press Release 2018
Press Release 2018
Year-end Mineral Reserves 2018
Management Discussion & Analysis 2017
Technical Report 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Other 2016
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