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United States
Stillwater Mine (Stillwater Operation)

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 Location:
114km SW from Billings, Montana, United States

  Address:
2505 Nye Rd
Nye
Montana, United States
MT 59061
Phone  ...  Subscription required
Fax(406) 328-8506
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Processing
  • Production
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  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Platinum
  • Palladium
Mining Method
  • Ramp & Fill
  • Overhand Cut & Fill
  • Sub-level stoping
  • Hydraulic backfill
Processing
  • Flotation
Mine Life2046


Owners & OPERATOR

Source: p. 189
CompanyInterestOwnership
Stillwater Mining Company (operator) 100 % Direct
Sibanye-Stillwater Ltd. 100 % Indirect
On 9 December 2016, Sibanye-Stillwater announced it had reached a definitive agreement to acquire Stillwater Mining Company for US$18 per share in cash, or US$2,200 million in aggregate. The effective date of the implementation of the Stillwater Transaction was 4 May 2017, when Sibanye-Stillwater took over legal ownership of Stillwater.

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


Summary:


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The Company processes ore from the Stillwater Mine through a surface concentrator facility (mill) adjacent to the Stillwater Mine shaft. Crushed mine ore is fed into the concentrator, mixed with water and ground to slurry in the concentrator’s mill circuits to liberate the PGM-bearing sulfide minerals from the rock matrix. Various reagents are added to the slurry, which then is agitated in a froth flotation circuit to separate the valuable sulfides from the waste rock. In this circuit, the sulfide minerals are successively floated, recycled, reground and refloated to produce a concentrate suitable for further processing. The final flotation concentrate, which represents approximately 2.0% of the original ore weight, is filtered, placed in large bins and then transported by truck to the Company’s metallurgical complex in Columbus, Montana.

Recoveries & Grades:

CommodityParameter20162015201420132012
Platinum Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Platinum Concentrate Grade, oz/ton  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Palladium Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Palladium Concentrate Grade, oz/ton  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
2E (Pt, Pd) Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
2E (Pt, Pd) Head Grade, oz/ton 0.490.460.50.50.58
Subscription required - Subscription is required.

Production:

CommodityProductUnits201920182017201620152014
2E (Pt, Pd) Metal in concentrate koz  ......  Subscription required  ......  Subscription required228327320341
Platinum Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Palladium Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
2E (Pt, Pd) Concentrate k tons 16,90517,20216,463
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Daily milling capacity  ......  Subscription required  ......  Subscription required3,000 tons3,000 tons
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required715.2 k tons747.9 k tons748.6 k tons
Daily mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required1,954 tons2,049 tons
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 3.8 Mt 2E (Pt, Pd) 19.2 g/t 2.326 M oz
Probable 23 Mt 2E (Pt, Pd) 19.5 g/t 14.39 M oz
Proven & Probable 26.8 Mt 2E (Pt, Pd) 19.4 g/t 16.716 M oz
Measured 5.6 Mt 2E (Pt, Pd) 19.5 g/t 3.499 M oz
Indicated 31.3 Mt 2E (Pt, Pd) 17.9 g/t 17.993 M oz
Inferred 48.1 Mt 2E (Pt, Pd) 17.3 g/t 26.706 M oz
Total Resource 85 Mt 2E (Pt, Pd) 17.6 g/t 48.199 M oz

Commodity Production Costs:

CommodityUnits2016201520142013
Total cash costs 2E (Pt, Pd) USD 437 / oz† 487 / oz† 533 / oz† 484 / oz†
† Net of By-Product.

Operating Costs:

Units2016201520142013
Total operating costs ($/ton milled) USD 200208243221

Financials:

Units201620152014
Sustaining costs M USD  ......  Subscription required 52.4   60.1  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 16, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
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 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Year-end Mineral Reserves 2017
Form 10-K 2016
Form 10-K 2015
Technical Report 2011
Subscription required - Subscription is required.

Aerial view:

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