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South Africa
De Bron Merriespruit Project

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 Location:
24 km NE from Theunissen, South Africa

  Project Contacts:
Constantia Office Park Cnr 14th Avenue & Hendrik Potgieter Road Bridgeview House, Ground Floor (Lake
Johannesburg
South Africa
1709
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WebsiteWeb
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  • Overview
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  • Geology
  • Mining
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  • Reserves
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Overview

StagePre-Feasibility
Mine TypeUnderground
Commodities
  • Gold
Mine Life23 years (as of Jan 1, 2020)
De Bron Merriespruit (DBM) Project, for a which a historical PFS was completed, was previously included in the Mineral Reserves, but has been excluded from the declaration, as at 31 December 2021 pending an updated PFS.


Owners

Source: p. 8
CompanyInterestOwnership
Sibanye-Stillwater Ltd. 100 % Indirect
Wholly-owned and managed projects in study phase include Bloemhoek, De Bron Merriespruit and Beisa. Bloemhoek and De Bron Merriespruit are both gold projects, which form part of the Southern Free State (SOFS) exploration project area.

Contractors

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Deposit Type

  • Conglomerate hosted


Summary:

Gold and uranium deposits in the De Bron Merriespruit (DBM) Project are hosted by quartz-pebble conglomerates developed on laterally continuous unconformity surfaces. These reefs are generally characterised by shallow dips of between 10° to 25° and thicknesses of 0.6 m to 2.1 m that make them suitable for exploitation by means of typical narrow stoping techniques. However, central to the establishment of any mining operation within the Wits Gold project areas is the delineation of sufficiently large areas of laterally continuous bodies of economically mineralised conglomerates.

The DBM Project is situated on the eastern up-throw side of the De Bron Fault, to the immediate south of Harmony Gold Mine where a triangular block of the Central Rand Group is preserved. Four prospective reefs, namely the Beatrix, Kalkoenkrans, B and Leader Reefs, are developed within a 20 m to 40 m stratigraphic interval occurring at depths of 500 m to 1,200 m below surface. Within the project boundaries, the reefs extend by up to 8 km in a north-easterly direction and as much as 4 km in a north-westerly direction.

Conglomerate Reefs
Three primary reef horizons containing gold and uranium are developed on well-defined regional unconformities in this area. These include the Beatrix, Kalkoenkrans and Leader Reefs, all of which have been mined extensively in the SOFS region. The B Reef is considered a secondary reef horizon.

Beatrix/VS5 Reef
The erosion and re ........


Mining Methods


Summary:

A number of high-level trade-off mining methods were investigated during the first phase of the PFS. Finally two main options were selected for the more detailed final stage of the PFS. The first option (“Option 1”) is based on standard conventional breast mining practiced in the Witwatersrand Basin, while the second option (“Option 2”) investigates a semi-mechanised variation to the down- dip mining methodology currently practiced in the platinum mining industry of the Bushveld Complex.

For both options it is envisaged that a twin shaft system will be sunk to 660 m with a top production level commencing on 560 m, from where a twin decline system will provide access to the deeper parts of the orebody. For both options the off-reef infrastructure has been developed using trackless mechanised equipment to facilitate a rapid production build up with conventional on-reef development in order to minimize dilution. A system of off-reef trackless footwall haulages are developed on strike below the orebody.

For Option 1, cross-cuts to reef are spaced at 180 metres with on-reef raises and conventional breast stoping completing the layout. Option 2 differs from Option 1 in that the on-reef development and mining is done on dip as opposed to on strike.

The mining method for Option 2 involves closely spaced on-reef raises (spaced 30 m apart). Pre- development of these raises will improve orebody understanding and also allows for selective mining and im ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsLOM
Gold M oz 2
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Tonnes milled, LOM 15,400 Mt *
* According to 2016 study.

Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Indicated 16.7 Mt Gold 4.2 g/t 2.3 M oz
Inferred 3.1 Mt Gold 3.2 g/t 0.3 M oz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Gold ZAR 1,143 / t *  
All-in costs Gold ZAR 1,478 / t *  
* According to 2016 study / presentation.

2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
After-tax NPV @ 8% $M ZAR  ......  Subscription required
After-tax IRR, %  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 21, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Form 20-F 2018
Corporate Presentation 2016
Pre-Feasibility Study Report 2012
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