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Zimbabwe
Trojan Mine

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 Location:
5 km SW from Bindura, Zimbabwe

  Address:

P.O. Box 35
Bindura
Zimbabwe
Phone  ...  Subscription required
Fax+263 (0)271 7572
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  • Overview
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  • Geology
  • Mining
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  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Nickel
Mining Method
  • Sub-level caving
Processing
  • Flotation
Mine Life9 years (as of Jan 1, 2016)


Owners

 
CompanyInterestOwnership
Sotic International Ltd. 74.7 % Indirect
Bindura Nickel Corporation Ltd. 100 % Direct

Deposit Type

  • Metamorphic


Summary:

The nickel sulphide deposit at Trojan Mine occurs within a pile of ultramafic lavas subjected to a lower amphibolite grade of metamorphism and are characterised by lensoidal bodies of serpentinite. The lavas form part of the Upper Greenstones (Bulawayan Group) of the Mazowe greenstone belt. The serpentinite bodies are separated from each other by cherts, BIFs, graphitic shales and felsic volcanics. The footwall and hanging wall of the nickel bearing serpentinites are formed by komatiitic and tholeiitic basalts. A doleritic dyke cuts through the serpentinites and displays nickel sulphide along its sheared contact. The regional setting and deformation of the Harare-Bindura schist belt with thrusting and doming of the Chinamora batholith has given rise to the deformation imprint observed in host rocks at the mine. The general strike of the ore bodies is east–west and dip steeply (75° to 85°) to the north and this is controlled by the regional foliation trend. The two major ore bodies are the Main Orebody and the Hanging Wall Orebody. The massive and near massive ores occupy a narrow and discontinuous zone along the footwall of the Main Orebody and this is called the Footwall Massive Orebody. The Main Orebody is the largest, and averages 250m long and 30m wide. There are other smaller ore bodies such as Trojan Hill, Cardiff East and Cardiff Far East, with dimensions of 100m x 15m and 200m x 15m respectively. Drilling has outlined the Main Orebody to a depth of 1180m below surface. Approximately 300m of longhole drilling is still planned to increase the confidence in the geometry of the Main Orebody at depth, and reduce the variation on estimation of grade, for the current shaft deepening programme.

Three types of nickel sulphide ore are found at Trojan Mine, namely: massive ore, near massive ore and disseminated ore, whose main sulphide minerals are pyrrhotite, pentlandite and chalcopyrite, with pyrrhotite being the most abundant. Minor amount of millerite and pyrite are also present. The massive and near massive ores are situated towards the base of the ultramafic units and are overlain by the disseminated ore. The main and hanging wall orebodies contain all three types of mineralisation.


Mining Methods

  • Sub-level caving


Summary:

Trojan Mine employs a sub-level caving mining method to extract ore from the Main Orebody; and the Hanging Wall Ore body that are steeply dipping (some 75-85o) and separated by a barren zone some 50m in thickness. The ore bodies are accessed from drives installed in the foot wall on levels developed from a sub-vertical shaft system, from 7L to 35L (the lowest working level and some 1,130m below surface), that is used to hoist rock and transport men and material to the workplaces.

Main levels are installed at 60m intervals and comprise a tracked haulage. Sub-levels are installed at 15m intervals from a footwall ramp that is developed between main levels. Currently mining is being conducted between 29L and 31L and the average historical drop down rate is equivalent to some 35m vertical per year. This rate is forecast to increase as the future footprint of the ore body decreases. The stoping operation is fully trackless using long-hole drill rigs and LHDs for all cleaning. Development is partially mechanised with some hand held drilling but all cleaning is by LHD.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

Crushed ore at approximately 80% passing 12mm is conveyed to a conical stockpile. The crushed ore is delivered to three primary ball mills and the combined mill discharge is pumped to two classifying cyclones, with cyclone underflow being returned to two of the primary ball mills operating in closed circuit. Cyclone overflow is dewatered in a cluster of cyclones before being fed to the primary flotation plant.

Recoveries & Grades:

CommodityParameter2017201620152014
Nickel Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Nickel Head Grade, % 1.731.71.51.38
Subscription required - Subscription is required.

Production:

CommodityUnits2017201620152014
Nickel t 6,7626,6217,3067,026
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics2017201620152014
Tonnes milled  ......  Subscription required440,449 t598,766 t589,637 t
Ore tonnes mined  ......  Subscription required410,423 t599,572 t595,656 t

Reserves at March 31, 2016:

CategoryTonnage CommodityGradeContained Metal
Measured 1,615 kt Nickel 1.09 % 17,610 kt
Indicated 1,639 kt Nickel 1.39 % 22,744 kt
Inferred 3,192 kt Nickel 2.03 % 64,848 kt

Commodity Production Costs:

CommodityUnits2017201620152014
C1 cash costs Nickel USD 5,978 / t 8,000 / t 11,567 / t
C3 fully allocated costs Nickel USD 5,631 / t 6,818 / t 8,558 / t 12,462 / t

Financials:

Units201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required 9.3  
Revenue M USD  ......  Subscription required  ......  Subscription required
Operating Income M USD  ......  Subscription required  ......  Subscription required
Gross profit M USD  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 15, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Financial Review 2017
Annual Report 2016
Annual Report 2014
Technical Report 2007
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Aerial view:

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