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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
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  • 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 Life2030
In 2019, mining of the open pit was stopped for economic reasons and this production 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 2025 to supplement the decrease in production from the underground mine.
Latest NewsMandalay Resources Corporation Announces 2022 Fourth Quarter and Full-Year Production and Sales Results, Provides Guidance for 2023     January 13, 2023


Owners

Source: p. 27
CompanyInterestOwnership
Mandalay Resources Corp. 100 % Indirect
Ownership Tree
Mandalay is a publicly listed company that effectively holds 100% of the Björkdal Property through the Swedish registered companies Björkdalsgruvan AB and its subsidiary Björkdal Exploration AB. Björkdalsgruvan AB owns eleven mining concessions on the Björkdal Property and one mining concession hosting the Norrberget deposit. An additional concession, Norrliden K nr 1, is held by Explor Björkdalsgruvan AB.

Contractors

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Deposit Type

  • Skarn
  • Vein / narrow vein
  • Mesothermal


Summary:

Björkdal Gold Mineralisation
The Björkdal gold deposit is a lode-style, sheeted vein deposit hosted within the upper portions of the Skellefte Group sediments. To date, the deposit measures roughly 2,000 m in length, 1,800 m in width and extends 600 m deep. Gold can be found within quartz veins that range in thickness from less than one centimetre to more than several decimetres. These veins are usually observed with vertical to sub-vertical dips and strike orientations between azimuth 000° and azimuth 090°. The majority of veins strike between azimuth 030° and 060°. Veining is locally structurally complex, with many cross-veining features observed and thin mineralised quartz veinlets in the wall rocks proximal to the main quartz veins.

Gold-rich quartz veins are most often associated with the presence of minor concentrations of sulphide minerals including pyrite, pyrrhotite, marcasite, and chalcopyrite. Associated non-sulphide minerals include actinolite, tourmaline, and biotite. Scheelite and bismuthtelluride compounds (i.e. tellurobismuthite and tsumoite) are also commonly found within the gold-rich quartz veins, which are typically excellent indicators of gold mineralisation.

Gold occurs dominantly as free gold, however, gold mineralisation can also be associated with bismuth-telluride minerals, electrum, and pyroxenes. Silver is observed as a minor by-product in the Björkdal processing plant, however very little is known about its deportment wi ........


Mining Methods

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


Summary:

The current environmental permit limits the total Björkdal production capacity to 1.70 Mtpa. In 2019, mining of the open pit was stopped for economic reasons and this production 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 realises more value, so open pit mining has been deferred for several years until the stockpile is diminished and open pit production is needed to offset reducing underground production.

The current production strategy is to maximise the underground extraction and delivery to the processing plant with any additional feed requirements sourced from stockpiles.

As presently envisaged in the LOM plan, open pit pre-stripping and production will be restarted in 2025 to supplement the decrease in production from the underground mine.

Underground
The known Björkdal underground deposit lies within a footprint of approximately 1,600 m x 600 m and has a vertical extent of approximately 480 m.

The long-term LOM underground production rate is planned to average 1,135,000 tpa up until 2024, and 648,000 tpa thereafter until production tails off in 2029. On vein development (OVD) will be carried out over approximately four years and stope production will be carried out over approximately eight years. A decrease in production is planned after 2025, when the underground output reduces. ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2022202120202019201820172016
Gold Payable metal koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required466248
Gold Concentrate kt  ......  Subscription required2.54.53.6
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,155,751 t871,625 t1,130,733 t1,138,742 t
Tonnes processed  ......  Subscription required  ......  Subscription required1,261,604 t1,251,453 t1,261,803 t1,288,927 t
Daily processing capacity  ......  Subscription required  ......  Subscription required3,700 t3,700 t3,700 t3,700 t
Daily processing rate  ......  Subscription required  ......  Subscription required3,400 t3,400 t3,500 t3,600 t
Annual processing capacity  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2021:
A marginal cut-off grade of 0.37 g/t Au was applied to estimate open pit Mineral Reserves. Underground Mineral Reserves are based on a cut-off grade of 0.88 g/t Au for material mined within stopes. An incremental cut-off grade of 0.37 g/t Au was used for development material. Stockpile Mineral Reserves are estimated at a cut-off grade of 0.37 g/t Au.

The Björkdal open pit Mineral Resource is estimated at a cut-off grade of 0.33 g/t Au. The Norrberget open pit Mineral Resources are estimated at a cut-off grade of 0.35 g/t Au. The Björkdal underground Mineral Resource is estimated at a block cut-off grade of 0.77 g/t Au for all veins.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (UG) 1,127 kt Gold 2.05 g/t 74 koz
Probable Stockpiles 2,532 kt Gold 0.61 g/t 50 koz
Probable In-Situ (OP) 3,111 kt Gold 1.16 g/t 116 koz
Probable In-Situ (UG) 5,350 kt Gold 1.76 g/t 302 koz
Proven & Probable Total 12,121 kt Gold 1.39 g/t 542 koz
Measured In-Situ (UG) 1,851 kt Gold 2.62 g/t 156 koz
Indicated Stockpiles 2,532 kt Gold 0.61 g/t 50 koz
Indicated In-Situ (OP) 3,161 kt Gold 2.23 g/t 227 koz
Indicated In-Situ (UG) 9,663 kt Gold 2.3 g/t 713 koz
Measured & Indicated Total 17,207 kt Gold 2.07 g/t 1,146 koz
Inferred In-Situ (OP) 3,329 kt Gold 1.13 g/t 121.5 koz
Inferred In-Situ (UG) 3,484 kt Gold 2.12 g/t 237 koz
Inferred Total 6,813 kt Gold 1.64 g/t 359 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,159 / oz   816 / oz   956 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required
All-in costs Gold USD  ......  Subscription required 1,452 / oz   1,083 / oz   1,190 / oz  
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units2021202020192018201720162015
UG mining costs ($/t milled) USD 2622.4
Combined mining costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 27.9   26   18.5  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 64.1   74.3   60.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -7.1   6.3   1.7  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -4.7   5   1.7  
EBIT M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -5.1  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.2   26.2   14.6  
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2021:
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 Sep 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 26, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
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
................................... 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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News:

NewsDate
Mandalay Resources Corporation Announces 2022 Fourth Quarter and Full-Year Production and Sales Results, Provides Guidance for 2023 January 13, 2023

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