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Zimbabwe
Mimosa Mine

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 Location:
24 km W from Zvishavane, Zimbabwe

  Address:
Dadaya Road Private Bag 638
Zvishavane
Zimbabwe
Phone  ...  Subscription required
Fax+263-54-229131
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Platinum
  • Palladium
  • Rhodium
  • Gold
  • Nickel
  • Copper
Mining Method
  • Bord-and-pillar
Processing
  • Crush & Screen plant
  • Flotation
Mine Life10 years (as of Jan 1, 2020)


Owners & OPERATOR

Source: p. 83
CompanyInterestOwnership
Sibanye-Stillwater Ltd. 50 % Indirect
Impala Platinum Holdings Ltd. 50 % Indirect
Mimosa Mining Company (PVT) Ltd. (operator) 100 % Direct
Mimosa Mining Company is jointly owned by Impala Platinum and Sibanye-Stillwater on a 50:50 shareholding, following the conclusion of a deal on 12 April 2016, which resulted in Sibanye-Stillwater acquiring all the shares formerly belonging to Aquarius (Pvt) Ltd. The operation is managed by Impala Platinum.

Deposit Type

  • Magmatic


Summary:

PGM mineralisation at Mimosa is located in four erosionally isolated and fault-bounded blocks, namely, from north to south, the North Hill orebody, South Hill orebody, Mtshingwe Fault Block orebody and Far South Hill orebody areas. Each of these blocks is host to a pyroxenite layer known as the P1 pyroxenite layer which is overlain by a layer of gabbro. The platinum-bearing Main Sulphide Zone (MSZ) is located in the P1 pyroxenite some 10m below the ultramafi c/mafic contact. The MSZ is a continuous layer, 2m to 6m thick, and forms an elongated basin. The zone strikes in a north-northeasterly trend and dips at about 14° on the margins flattening towards the axis of the basin. The MSZ at Mimosa has a well-defined grade profi le where peak base metal and PGM values are offset vertically, with palladium dominant towards the base, platinum in the centre and nickel towards the top. At Mimosa the MSZ is visually identified using pyroxene and sulphide mineralisation followed by confirmatory channel sampling and underground XRF channel definition. Minor faults and dykes are present at Mimosa. Although no potholes have been identified, low-grade areas and areas of no mineralisation, or ‘washouts’, have been intersected. These are all accounted for in the Mineral Resource and Mineral Reserve estimate.


Mining Methods

  • Bord-and-pillar


Summary:

Mimosa is a shallow underground mine accessed by the two decline shafts, Wedza Decline and Blore Shaft. Mechanised bord and pillar mining method is used to extract ore over average stoping width of 2m. Historically, the bord widths have varied from 15m to 6m wide, depending on the ground control district. Minimum pillar sizes are dependent on depth to give a safety factor of greater than 1.6, with pillars being 10m by 3m for 18 Level and above, 10m x 4.5m from 20 to 28 Level in areas where 15m bords were mined. Current mining consists of 5.5m to 7m bord sizes with 8m by 4m for the whole mine. The bord sizes are 7m, 6.5m and 5.5m in GCD class C, D and E respectively. The strike pillars in panels are elongate on strike so that the longest dimension of the pillar intersects the dominant joint set (J1) at nearly 90 degrees. Most of the faults and dykes are part of the dominant J1 joint set.

The mining cycle involves mechanised support drilling and installation, MSZ channel definition and marking, mechanised face drilling, charging and blasting followed by mechanised lashing onto a conveyor network feeding to an underground bunker. From the bunker, ore is conveyed to a surface stockpile ahead of feeding into the processing plant. Optimum stoping widths and mining cut selection are regularly reviewed given variation in metal prices and the non-linear distribution of the different metals. Mining models are defined relative to the platinum peak position within the MSZ. The current planned mining horizon is a two-metre slice defined by the hanging wall at 0.45m above and the footwall at 1.55m below the Platinum peak position. This overbreaks to an actual mining width average of 2.1m. The reported mined grade is based on inverse distance block modelling of drillhole values using Surpac™.

Mine design and scheduling is computer aided using MineShed™ software. The mine plan is derived from a target milling throughput including a provision for a strategic surface stockpile. Losses due to mining modifying and geological factors are applied in production scheduling to produce a LoM production (tonnage and grade) profile. A tailcut has been effected on LoM I to exclude the last two years whose cash flows are negative. The LoM I tail cut tonnage is classed as LoM II A for opportunity extraction with LoM II. North Hill Mine is now at BFS stage and is classifi ed as LoM II. LoM I comprises extraction from the orebody’s Mineral Reserves at Wedza and Mtshingwe, which is the southern part of the South Hill orebody. Work is underway to assess various options to optimise extraction from different ore sources of the remaining Mineral Resources of Mimosa. The updated LoM indicates the mine plan, which dictated accelerated mining of the Mtshingwe Shaft area, in order to deliver a constant head grade and throughput to the mill.


Crushing and Grinding


Processing

  • Crush & Screen plant
  • Flotation

Flow Sheet: Subscription required

Summary:

Mimosa has a concentrator plant on site where initial processing is done. Concentrate is transported by road to Impala Platinum’s Mineral Processes in Rustenburg in terms of a life-of-mine offtake agreement with Impala Refining Services (IRS). Mimosa is evaluating various alternatives for the beneficiation of its material within Zimbabwe.

Recoveries & Grades:

CommodityParameter202020192018201720162015
6E (Pt,Pd,Rh,Au,Ir,Ru) Head Grade, g/t 3.853.833.843.833.883.93

Production:

CommodityUnits202020192018201720162015
6E (Pt,Pd,Rh,Au,Ir,Ru) koz  ......  Subscription required  ......  Subscription required  ......  Subscription required259254250
Platinum koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Palladium koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Rhodium koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Nickel t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required2,641 kt2,586 kt
Subscription required - Subscription is required.

Reserves at June 30, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 27.6 Mt Platinum 1.5 M oz
Proven & Probable 27.6 Mt Palladium 1.2 M oz
Proven & Probable 27.6 Mt Nickel 0.15 %
Proven & Probable 27.6 Mt 4E (Pt, Pd, Rh, Au) 3.45 g/t 3.1 M oz
Proven & Probable 27.6 Mt 6E (Pt,Pd,Rh,Au,Ir,Ru) 3.7 g/t 3.3 M oz
Proven & Probable 27.6 Mt Copper 0.11 %
Total Resource 110.4 Mt Platinum 6.3 M oz
Total Resource 110.4 Mt Palladium 4.9 M oz
Total Resource 110.4 Mt Nickel 0.14 %
Total Resource 110.4 Mt 4E (Pt, Pd, Rh, Au) 3.6 g/t 12.8 M oz
Total Resource 110.4 Mt 6E (Pt,Pd,Rh,Au,Ir,Ru) 3.82 g/t 13.6 M oz
Total Resource 110.4 Mt Copper 0.11 %

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs 6E (Pt,Pd,Rh,Au,Ir,Ru) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 710 / oz 690 / oz 716 / oz
Cash costs Platinum USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,511 / oz 1,463 / oz 1,525 / oz
Cash costs Platinum USD  ......  Subscription required†  ......  Subscription required† 335 / oz† 486 / oz† 154 / oz†
All-in sustaining costs (sold) Platinum USD  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units202020192018201720162015
Total operating costs ($/t milled) USD 707168676669

Financials:

Units202020192018201720162015
Capital expenditures (planned) M USD
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 30  
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 3,425  ZAR
Gross profit M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 785  ZAR
Pre-tax Income M  ......  Subscription required  ......  Subscription required 359  ZAR
After-tax Income M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 36  ZAR
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2020
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2020
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2020
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 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Integrated Report 2017
Other 2017
Fact Sheet 2016
Fact Sheet 2010
Other 2008
Subscription required - Subscription is required.

Aerial view:

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