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United States
Stillwater Mine (Stillwater Operation)

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 Location:
114km 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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  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Platinum
  • Palladium
Mining Method
  • Ramp & Fill
  • Sub-level stoping
  • Hydraulic backfill
Production Start...
Mine Life2055
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.


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


Summary:

Mineralisation characteristics:

• 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.

• Palladium and platinum are the main PGMs, both constituting between 7g/t to 40g/t over a variable thickness with economic mineralised thickness ranging from 0.9m – 2.7m and averaging 1.8m.

• Ratios of palladium to platinum in metallurgical concentrate are known to range from 3.4:1 (in situ 3.5:1) at Stillwater to 3.5:1 (in situ 3.6:1) at East Boulder.

• By-products of gold, rhodium, copper and nickel are recovered at the concentrators, smelter and refinery.

• Other associated PGMs such as iridium, ruthenium and osmium occur in low quantities and are generally not evaluated by Stillwater.

• The visual identification of the J-M Reef is facilitated by the presence of approximately 0.25% to locally 3% visible associated disseminated copper-nickel pathfinder sulphide minerals.


Mining Methods

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


Summary:

The two 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% – 20%).


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits202120202019201820172016
2E (Pt, Pd) Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required364228327
Platinum Metal in concentrate koz  ......  Subscription required
Palladium Metal in concentrate koz  ......  Subscription required
2E (Pt, Pd) Concentrate kt 15,336
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Daily milling rate  ......  Subscription required  ......  Subscription required
Daily milling capacity  ......  Subscription required  ......  Subscription required3,100 t3,100 t3,100 t3,000 tons
Annual milling rate  ......  Subscription required  ......  Subscription required680 kt
Tonnes milled  ......  Subscription required  ......  Subscription required715.2 k tons
Daily mining rate  ......  Subscription required  ......  Subscription required1,954 tons
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Mineral Reserve cut-off grade is 6.8 g/t 2E.

CategoryTonnage CommodityGradeContained Metal
Proven 4.6 Mt 2E (Pt, Pd) 17.2 g/t 2.6 M oz
Probable 35.8 Mt 2E (Pt, Pd) 11.9 g/t 13.7 M oz
Proven & Probable 40.4 Mt 2E (Pt, Pd) 12.5 g/t 16.2 M oz
Measured 21.7 Mt 2E (Pt, Pd) 15.6 g/t 10.9 M oz
Indicated 31.3 Mt 2E (Pt, Pd) 14.2 g/t 14.3 M oz
Measured & Indicated 53 Mt 2E (Pt, Pd) 14.8 g/t 25.2 M oz
Inferred 61.5 Mt 2E (Pt, Pd) 12.1 g/t 24 M oz

Commodity Production Costs:

CommodityUnits2016
Total cash costs 2E (Pt, Pd) USD 437 / oz†  
† Net of By-Product.

Operating Costs:

Units20162015
Total operating costs ($/ton milled) USD 200208

Financials:

Units20212016
Sustaining costs M USD 38.3  
Book Value M USD  ......  Subscription required
Subscription required - Subscription is required



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 20, 2022
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....................... Subscription required ....................... Subscription required Subscription required Jul 20, 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 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
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................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
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Form 20-F 2018
Integrated Report 2018
Year-end Mineral Reserves 2017
Form 10-K 2016
Form 10-K 2015
Technical Report 2011
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