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South Africa
Zandfontein (CRM) Mine

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 Location:
10 km S from Brits, South Africa

  Address:
Old Zandfontein Road
Brits
South Africa
0250
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  • Overview
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  • Geology
  • Mining
  • Processing
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  • Reserves
  • Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeTailings
Commodities
  • Chrome
  • Cr2O3
  • Platinum
  • Palladium
  • Rhodium
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Hydraulic mining
Processing
  • Spiral concentrator / separator
  • Dewatering
  • Filter press plant
  • Magnetic separation
Mine Life4 years (as of Jan 1, 2019)
The current mine lease area includes two operating mining sections (the Zandfontein and Maroelabult sections) and two development sections (the Crocette and Kareespruit sections). Maroelabult is subject to sale.

During 2019 the Company ramped-up production while completing all commissioning of the Retreatment Project.

The Company restarted PGM Circuit D in August 2020 and reported that during December 2020, Barplats delivered its first shipment of pressed filter cake PGM concentrate under the existing offtake agreement between Barplats and IRS, now Impala (the “Offtake Agreement”).
Latest NewsEastern Platinum Limited Reports Annual Results for 2020 and Provides an Operations Update     March 26, 2021


Owners & OPERATOR

Source: p. 38
CompanyInterestOwnership
Gubevu Consortium Investment Holdings (Pty) Ltd. 12.5 % Indirect
Eastern Platinum Ltd. 87.5 % Indirect
Barplats Mines Ltd (operator) 100 % Direct
On October 29, 2019, the Company announced Barplats had entered into a sales agreement (the “Resource Agreement”) with Eland Platinum (Pty) Limited (“Eland”). The Resource Agreement provides for sale of the mining rights, immovable property, infrastructure and equipment of the Maroelabult resource property (the “Assets”) located near Brits in South Africa. The consideration to be received is R20 million (US$1.4 million), the assumption of the rehabilitation obligation and immediate assumption of the care and maintenance costs (the “Purchase Price”) subject to representations and warranties by both parties. The Purchase Price is payable and enforceable on closing the transaction following the transfer of legal title and the completion of the various legal and regulatory obligations required in South Africa which the Company is forecasting to be completed during Q2 2021.

Deposit Type

  • Tailings
  • Intrusion related


Summary:

Zandfontein UG2 TSF
The tailings have been deposited in the TSF from 1980 until 2013, when the mine went on Care and Maintenance. The material in the TSF was primarily derived from the processing of UG2 Chromitite ore. The tailings deposited in the TSF, originated as fines after milling and extracting the PGEs concentrates. Therefore the Cr2O3, PGEs and Au mineralisation that is now being targeted in the tailings, originates from within the UG2 chromitite seam itself. Some of the tailings were later reprocessed at Barplats to extract a limited amount of the Cr2O3 (an estimated at 1%-2% was processed) and PGEs (estimated at a grade of 0.2 g/t) and then re-deposited in the new front compartment of the tailings dam (Figure 9). The tailings also contain silicate material and minor amounts of base sulphide minerals or their oxidized products.

The average Cr2O3 and FeO contents (derived from 246 tailings samples) for the the Project are; 20.72% and 15.65% respectively. The average of Cr to Fe ratio on the TSF in Domain 101 is 1.35 and in Domain 102 1.28. The chromium oxide present in the tailings is in the form of chromite grains that have been liberated during the crushing and milling of the chromitite ore. The Au is expected to be present as very fine grained particles that were released after the oxidation of the primary sulphide minerals. It is assumed that the major silicate minerals present are pyroxene (enstatite/bronzite composition) and plagioclase feldspar (anorthite); these occur with chromite, the second major constituent. The PGEs are pre-dominantly associated with the silicate fraction and are expected to consist of Fe-Pt alloys, and the PGMs that are associated with Pt-Pd sulphides (cooperite and braggite) and Ru,Os,Ir sulphide (laurite) that were originally interstitial to the chromite grains and also a very minor portion of small platinum group minerals or alloys that are contained within the chromitite grains.

The mineralized units of the project area form part of the BIC, a large layered igneous intrusive body. In a large layered intrusion, such as the BIC, the sulphide droplets that segregate out of the parental magma will eventually settle out of the magma and, once magma convection ceases, will be deposited on already consolidated layers of the magma chamber to form sulphide-rich zones. [AIF, 2021, p.31]

The Merensky Reef has traditionally been the most important PGM-producing horizon in the BIC. In addition to PGM mineralization associated with the Merensky Reef, all chromitite layers in the critical zone of the BCX contain elevated concentrations of PGM. The UG2 CL is the only chromitite layer where significant mining of PGM takes place. The UG2 CL of the western BIC limb is generally less than 1 m thick and is comprised of 60% to 90% chromite. However, in the project area the thickness of the UG2 CL ranges from 1.3 m to in excess of 1.5 m. The PGMs are interstitial to the chromite grains and are concentrated at the base and middle of the chromitite layer. The PGM concentration of the UG2 CL ranges from 3 ppm to 19 ppm and is generally dominated by Pt-Pd sulphides. [AIF, 2021, p.31]


Mining Methods

  • Truck & Shovel / Loader
  • Hydraulic mining


Summary:

Barplats’ preference is not to establish a new TSF (Tailing Storage Facility) and so the strategy is for the tailings from the plant to be placed back onto the footprint of the existing TSF while it is being exploited. The TSF has been divided into six areas as part of a strategy to exploit the total volume of tailings material.

Hydraulic mining and Mechanical loading of material on the north-western section will start simultaneously. The associated tailings from the plant following processing will be re- deposited using the cyclone method.

Mechanical loading is necessary in the coarse area of the TSF where material is chemically bonded in layers, which is not able to be hydraulically broken down to the minus 3mm fraction, which is the maximum plant feed size.

Mining Methodology.
Modelling was used to determine the most suitable technique for mining the TSF. The methodology involves continual and simultaneous cleaning, construction, hydraulic mining and deposition activities.

Certain areas need to be excavated using mechanised equipment (i.e. coarser harder material) while other sections of the TSF can be mined hydraulically (i.e. finer softer material).

Mechanised Operations.
Coarse material will be excavated, using a dry mechanised mining method.

The mechanically mined material will be trucked to a scalping screen, which will dry screen the vegetation from the material, after which it will pass through a roller crusher that will ensure that all the material is screened to minus 28 mm.

The material will be pulped and pumped with a jet pump at a planned rate of 203 tph, to the central pumping station with a 3mm wet screen where it will be mixed with the hydraulically mined material.

At the central pumping station, the oversize material (+3 mm), from the test work, indicated to be approximately 50% of the mechanically mined material (100 tph), will pass through a scrubber in closed circuit with the 3mm screen.

The grizzly feeder screen will be set at 40mm and a roller crusher set at 10 mm to protect the booster pump which will transfer the slurry through HDPE pipes to the main slurry pump station.

Hydraulic Operations.
Hydraulic mining involves the material being hydraulically sluiced from the planned sections or blocks of the TSF and transferred in a slurry form to a collection sump via a system of drains or launders. A pump station is then used to pump the slurry to the plant.

The hydraulic sluicing is achieved by using track mounted high pressure water monitor guns (one operating and one on standby) to generate a slurry from the material, which has a specific gravity (SG) of 3.6 t/m3. The resulting slurry density is expected to fluctuate from 1.35 t/m3 to 1.80 t/m3. Water is moved through a series of pumps to increase the pressure of the water to approximately 275 kPa before it is directed through a network of pipes to the high-pressure monitor units on top of the TSF.

The slurry will flow through a launder system to a launder collection sump (on-dam catchment area) and collection barge vertical spindle pump.

A series of 110 kW satellite spindle pumps will be positioned to assist the flow. Static screens (+50 mm) will be used at the satellite pumps to remove debris and vegetation. The 12 m deep catchment area and launder will be created using an excavator. A floating “tripod” barge will be installed in the catchment area to include a vertical spindle pump for onward transfer of the slurry to the main slurry pump station.

Following completion of an upper bench, a second catchment sump will need to be established. Two vertical spindle pumps will be used on a barge system to feed the main transfer slurry pump station. The final cut will follow the same sequence of launder and mining the final footprint from the higher contour levels towards the lower contour levels.

The two satellite pumps will be placed inside the final cut catchment area as a sump and feed the main pump station with slurry. The collection sump, together with the high wall will act to safe guard against flooding of the pump station by collecting runoff water and barricading between the sump and pump station.

A Tailings Storage Facility (TSF) operator will be contracted to do the mining while Chrome Recovery Plant (CRP ) personnel will operate the CRP.


Crushing and Grinding


Processing

  • Spiral concentrator / separator
  • Dewatering
  • Filter press plant
  • Magnetic separation

Flow Sheet: Subscription required

Summary:

The Retreatment Project includes a combined hydro and mechanical re-mining method, magnetic separation applied to produce chrome concentrates, thus obtaining superior yield result compared to traditional gravity technology. The Retreatment Project is the only large-scale magnetic separation application in South Africa. [AIF, 2021, p.13]

The Company restarted PGM Circuit D in August 2020 and reported that during December 2020, Barplats delivered its first shipment of pressed filter cake PGM concentrate. [AIF,2021, p.14]

The CRP will remain within the existing processing complex. Its design is based on tried and tested technology and comprises the use of spiral concentrators (spirals), which are generally standard throughout the South African chrome industry. Wherever possible, existing equipment will be retained to reduce capital expenditure. The old spirals will, however, all be replaced with modern spirals to improve recovery and yield. The existing spiral struc ........

Recoveries & Grades:

CommodityParameter2019
Chrome Concentrate Grade, %  ......  Subscription required

Production:

CommodityUnits2019
Chrome kt  ......  Subscription required
All production numbers are expressed as concentrate.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019
Ore tonnes mined  ......  Subscription required
Subscription required - Subscription is required.

Reserves at September 1, 2017:

CategoryTonnage CommodityGradeContained Metal
Proven 6.25 Mt Cr2O3 22.42 % 1.4 Mt
Probable 0.18 Mt Cr2O3 20.28 % 0.04 Mt
Proven & Probable 6.42 Mt Cr2O3 22.36 % 1.44 Mt
Measured & Indicated 13.68 Mt Cr2O3 20.72 % 2.834 Mt
Measured & Indicated 13.68 Mt Platinum 0.742 g/t
Measured & Indicated 13.68 Mt Palladium 0.307 g/t
Measured & Indicated 13.68 Mt Rhodium 0.169 g/t
Measured & Indicated 13.68 Mt Gold 0.008 g/t 3,404 oz
Measured & Indicated 13.68 Mt 3E (Pt, Pd, Au) 1.218 g/t 535,520 oz

Financials:

Units20192018
Revenue M USD  ......  Subscription required0.41  
Pre-tax Income M USD  ......  Subscription required-24.42  
After-tax Income M USD  ......  Subscription required-24.34  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2021
Subscription required - Subscription is required.

Staff:

EmployeesTotal WorkforceYear
Subscription required 2020
Subscription required 2019
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Technical Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Eastern Platinum Limited Reports Annual Results for 2020 and Provides an Operations Update March 26, 2021
Eastern Platinum Limited Announces Rights Offering in Order to Pursue Growth Opportunities December 11, 2020
Eastern Platinum Limited's Operations in South Africa to Temporarily Close Effective March 27, 2020 to Comply with the South African 21 Day Lockdown Due to Coronavirus March 25, 2020
Eastplats Announces First Shipment of Chrome Concentrate from Barplats Zandfontein UG2 Tailings Retreatment Operations February 11, 2019

Aerial view:

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