• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
United States
Stillwater Mine (Stillwater Operation)

This page is not tailored to
devices with screen width under 750 px.
 Location:
114km SW from Billings, Montana, United States

  Regional Office:
26 West Dry Creek Circle Suite 400
Littleton
Colorado, United States
80120
Phone  ...  Subscription required
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in United States
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StageProduction
Mine TypeUnderground
Commodities
  • Platinum
  • Palladium
Mining Method
  • Ramp & Fill
  • Overhand Cut & Fill
  • Raiseboring
  • Sub-level stoping
  • Alimak
  • Hydraulic backfill
Processing
  • Filter press plant
  • Dewatering
  • Crush & Screen plant
  • Flotation
Mine Life2045
In 2020 the Blitz (Stillwater East) expansion project at the Stillwater mine realised 99koz. In 2020, the project schedule was revisited after substantial delays due to water inflow encountered in the Benbow decline. The current plan puts targeted production of 300koz in 2024. This addition will bring the Stillwater Mine Complex to 625koz annually.


Owners

Source: p. 57,58
CompanyInterestOwnership
Stillwater Mining Company Inc. (operator) 100 % Direct
Sibanye-Stillwater Ltd. 100 % Indirect
Ownership Tree

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
  • Raiseboring
  • Sub-level stoping
  • Alimak
  • Hydraulic backfill


Summary:

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%);
• Overhand cut and fill stoping, utilising either raise bore or Alimak for access (<5%).


Crushing and Grinding


Processing

  • Filter press plant
  • Dewatering
  • Crush & Screen plant
  • 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.

Currently 64% (2020) of all concentrator tailings are returned underground for backfill. The remaining 36% is sent via pipeline to Hertzle ........

Recoveries & Grades:

CommodityParameter2020201620152014
2E (Pt, Pd) Recovery Rate, %  ......  Subscription required939393
Platinum Recovery Rate, %  ......  Subscription required939393
Platinum Concentrate Grade, oz/ton  ......  Subscription required4.994.635.19
Palladium Recovery Rate, %  ......  Subscription required939393
Palladium Concentrate Grade, oz/ton  ......  Subscription required16.71516.8
2E (Pt, Pd) Head Grade, oz/ton  ......  Subscription required0.490.460.5

Production:

CommodityProductUnits2020201920182017201620152014
2E (Pt, Pd) Metal in concentrate koz  ......  Subscription required  ......  Subscription required364228327320341
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 kt 15,33615,60514,935
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Daily milling rate  ......  Subscription required
Daily milling capacity  ......  Subscription required3,100 t3,100 t3,100 t3,000 tons3,000 tons
Annual milling rate  ......  Subscription required680 kt
Tonnes milled  ......  Subscription required715.2 k tons747.9 k tons
Daily mining rate  ......  Subscription required1,954 tons2,049 tons
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Mineral Reserve cut-off grade is 6.8 g/t 2E.

CategoryTonnage CommodityGradeContained Metal
Proven 4.3 Mt 2E (Pt, Pd) 15.7 g/t 2.189 M oz
Probable 26.6 Mt 2E (Pt, Pd) 16 g/t 13.678 M oz
Proven & Probable 31 Mt 2E (Pt, Pd) 15.9 g/t 15.867 M oz
Measured 6.7 Mt 2E (Pt, Pd) 17.1 g/t 3.662 M oz
Indicated 31.5 Mt 2E (Pt, Pd) 17.6 g/t 17.838 M oz
Inferred 48.3 Mt 2E (Pt, Pd) 17.2 g/t 26.755 M oz
Total Resource 86.5 Mt 2E (Pt, Pd) 17.4 g/t 48.255 M oz

Commodity Production Costs:

CommodityUnits201620152014
Total cash costs 2E (Pt, Pd) USD 437 / oz† 487 / oz† 533 / oz†
† Net of By-Product.

Operating Costs:

Units201620152014
Total operating costs ($/ton milled) USD 200208243

Financials:

Units20162015
Sustaining costs M USD 38.3   52.4  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 21, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 21, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 21, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 21, 2021
Subscription required - Subscription is required.

Staff:

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

Aerial view:

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2017-2022 MDO Data Online Inc.