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United States
Stillwater Operation (East Boulder Mine, Stillwater Mine)

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 Location:
115 km SW from Billings, Montana, United States

  Regional Office:
26 West Dry Creek Circle Suite 400
Littleton
Colorado, United States
80120
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WebsiteWeb
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  • Overview
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  • Mining
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  • Costs & Financials
  • Personnel
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Platinum
  • Palladium
Mining Method
  • Ramp & Fill
  • Overhand Cut & Fill
  • Sub-level stoping
  • Hydraulic backfill
Production Start...
Mine Life2061
The Stillwater mine has two principal mining sections: the current (Western) section, which has been in operation since 1986, produces approximately 250-300koz per annum of platinum and palladium in concentrate; and the Stillwater East section, a major project currently under development, started ore production in 2017.

The East Boulder mine has been in operation since 2002, and currently produces approximately 240Koz per annum of platinum and palladium in concentrate.


Owners

Source: p. 59, 60
CompanyInterestOwnership
Stillwater Mining Company Inc. (operator) 100 % Direct
Sibanye-Stillwater Ltd. 100 % Indirect
Ownership Tree

Contractors

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Deposit Type

  • Magmatic
  • Footwall hosted


Summary:

The J-M Reef is a magmatic reef type PGM deposit defined as the palladium-platinum rich stratigraphic interval, mainly occurring within a troctolite (OB-I zone) of the Lower Banded Series. The J-M Reef shows a high degree of variability in grades and thickness at a local level and the J-M Reef has PGM grades that are significantly higher than the Merensky Reef. The J-M Reef pinches and swells typically ranging from 0.9m to 2.7m and averaging 1.8m in thickness but can locally form keel-shaped zones which transgress the footwall mafic rocks, commonly reaching thicknesses of 6m and greater. These wider areas are locally referred to as “ballrooms”. There is no correlation of thickness to grade, so as these sulphide zones thicken, they can maintain grade and become an important source of metal. The J-M Reef shows a high degree of variability in grades and thickness at a local level and the J-M Reef has PGM grades that are significantly higher than the Merensky Reef. The J-M Reef pinches and swells typically ranging from 0.9m to 2.7m and averaging 1.8m in thickness but can locally form keel-shaped zones which transgress the footwall mafic rocks, commonly reaching thicknesses of 6m and greater. These wider areas are locally referred to as “ballrooms”. There is no correlation of thickness to grade, so as these sulphide zones thicken, they can maintain grade and become an important source of metal.

Palladium and platinum are the main PGMs, both constituting between 7g/t to ........


Mining Methods

  • Ramp & Fill
  • Overhand Cut & Fill
  • Sub-level stoping
  • Hydraulic backfill


Summary:

The Stillwater (including the Blitz expansion project) and East Boulder operations are located near the towns of Nye and McLeod in Montana, USA. Both are underground PGM operations. PGM production commenced in 1986 and has largely been uninterrupted.

The operations both target the J-M Reef zone, predominantly via mechanised ramp and fill mining method (+80%). All surface infrastructure and tailings management facilities are located within Stillwater and East Boulder operation operating permits, which cover an area measuring 1,396ha.

The Stillwater operation has two principal mining sections. The current section, which has been in operation since 1986, produces approximately 380koz per annum of platinum and palladium in concentrate. The Blitz section, a major expansion project currently under development, started ore production in 2017 and is currently producing 75koz per annum. The current section of the operation is accessed by a 580m deep shaft and five portals. The Blitz section is accessed by two portals.

East Boulder has been in operation since 2002, and currently produces approximately 230Koz per annum of platinum and palladium in concentrate. The East Boulder operation is accessed via twin 5,800m long decline tunnels.

The three principal mining methods are:
• Mechanised ramp and fill (both overhand and underhand) (80 – 90%);
• Sub-level extraction by long hole, open stoping with hydraulic backfilling (10 – 15%);


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2022202120202019201820172016
2E (Pt, Pd) Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required593376545
Platinum Metal in concentrate koz  ......  Subscription required
Palladium Metal in concentrate koz  ......  Subscription required
2E (Pt, Pd) Concentrate kt 29,118
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required1,411 kt1,339 kt855 kt1,371 k tons
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Reserves at December 31, 2021:
Mineral Reserve cut-off grade is 6.8 g/t 2E for Stillwater and 1.7 g/t 2E for East Boulder.

CategoryTonnage CommodityGradeContained Metal
Proven 8.2 Mt 2E (Pt, Pd) 15.4 g/t 4.1 M oz
Probable 60.1 Mt 2E (Pt, Pd) 12 g/t 23.2 M oz
Proven & Probable 68.3 Mt 2E (Pt, Pd) 12.4 g/t 27.3 M oz
Measured 39.9 Mt 2E (Pt, Pd) 14.7 g/t 18.9 M oz
Indicated 59.1 Mt 2E (Pt, Pd) 13.8 g/t 26.1 M oz
Measured & Indicated 99 Mt 2E (Pt, Pd) 14.1 g/t 45 M oz
Inferred 113.6 Mt 2E (Pt, Pd) 12.2 g/t 44.6 M oz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Total cash costs 2E (Pt, Pd) USD
All-in sustaining costs (AISC) 2E (Pt, Pd) USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 677 / oz†   651 / oz†  
All-in costs 2E (Pt, Pd) USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 880 / oz†   821 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units2021202020162015
Total operating costs ($/t milled) ZAR 5,1745,203174194

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M  ......  Subscription required  ......  Subscription required  ......  Subscription required 260.2  ZAR 226.9  ZAR 56.3  USD
Growth Capital M  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,574  ZAR
Capital expenditures M  ......  Subscription required  ......  Subscription required  ......  Subscription required 2,833  ZAR 1,654  ZAR
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required 15,873  ZAR 9,162  ZAR 711.3  USD
Operating Income M 24.1  USD
Pre-tax Income M  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M -1,531  ZAR 2,028  ZAR 9.5  USD
EBITDA M  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
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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 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
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................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Integrated Report 2018
Year-end Mineral Reserves 2018
Form 20-F 2017
Year-end Mineral Reserves 2017
Form 10-K 2016
Form 10-K 2015
Technical Report 2011
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