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South Africa
Burnstone Mine

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 Location:
8 km E from Balfour, South Africa

  Project Contacts:
Constantia Office Park Cnr 14th Avenue & Hendrik Potgieter Road Bridgeview House Ground floor
Weltevreden Park
South Africa
1709
Phone  ...  Subscription required
Fax+27-11-278-9863
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageRestarting
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Breast mining
  • Scattered stoping
Processing
  • Gravity separation
  • Centrifugal concentrator
  • Carbon re-activation kiln
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life21 years (as of Jan 1, 2020)
Development was stopped in May 2018 due to economics at the time, and the focus has been on establishing underground engineering infrastructure in preparation for a recommencing of mining production and development in 2022. The project has been approved for construction by the Board during March 2021.


Owners

Source: p. 5
CompanyInterestOwnership
Sibanye-Stillwater Ltd. 100 % Indirect
Sibanye Gold Eastern Operations (Pty) Ltd. (operator) 100 % Direct
Ownership Tree

Deposit Type

  • Conglomerate hosted


Summary:

Burnstone lies within the Witwatersrand Basin and Archaean (2.7 billion year-old) sedimentary basin. The Basin is filled with approximately 14,000m sedimentary and subordinate volcanic rocks, which have been folded along a north east to south-west axis into an asymmetrical synclinorium. The sediments consist mainly of quartzites and shales and less prevalent, but generally economically important, gold-bearing conglomeratic zones, which occur on regional unconformities. These are commonly referred to as reefs or placers.

Burnstone is located in the South Rand Basin, a subsidiary of the main Witwatersrand Basin. The gold-bearing target UK9 Reef of the Kimberley Formation, occurs in the Central Rand Group of rocks. This reef lies between the outcrop and a depth of 1,300m below surface in the mining right area. Structurally, the project area is located on the northern limb of the arcuate South Rand Basin, which is locally deformed by a east-north-east-plunging anticline and cut by east-west and north-south normal faults, formed in response to the stress regime corresponding to the main structural feature of the region, which is the east-west striking Sugarbush Fault. This fault is a left-lateral wrench fault, which comprises the northern boundary of the South Rand Basin at this point.

Shallow gold deposit exploiting the UK9a Reef of the Kimberley Formation, Central Rand Group, Witwatersrand Supergroup.

The UK9a Reef is a thin (<1m), highly channelised, shallow dipping (<10º) orebody. The minimum mining cut includes waste to a total of 110cm.


Mining Methods

  • Breast mining
  • Scattered stoping


Summary:

Shallow underground mining project with two established shaft complexes (one vertical and one decline shaft).

Conventional selective scattered breast mining with scraper cleaning and mechanised footwall infrastructure.


Mining Kimberly reef to an average depth of 550m (deepest 1.05km)


Crushing and Grinding


Processing

  • Gravity separation
  • Centrifugal concentrator
  • Carbon re-activation kiln
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

One CIL gold processing plant


Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 1382,000
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Tonnes milled, LOM 12,987,192 t *
Annual ore mining rate 1 Mt *
* According to 2016 study.

Reserves at December 31, 2020:
Mineral Reserve cut-off grade is 380 cm.g/t Au.

CategoryTonnage CommodityGradeContained Metal
Proven 0.9 Mt Gold 3.6 g/t 0.101 M oz
Probable 17.7 Mt Gold 3.7 g/t 2.083 M oz
Proven & Probable 18.6 Mt Gold 3.7 g/t 2.184 M oz
Measured 1.1 Mt Gold 6.2 g/t 0.225 M oz
Indicated 20.5 Mt Gold 5.3 g/t 3.492 M oz
Inferred 36.4 Mt Gold 4.6 g/t 5.399 M oz
Total Resource 58.1 Mt Gold 4.9 g/t 9.117 M oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold ZAR  ......  Subscription required *
Assumed price Gold USD  ......  Subscription required *
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Financials:

Units2017
Capital expenditures M ZAR 387  

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
After-tax NPV @ 15% $M ZAR  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 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 Subscription required Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Integrated Report 2018
Year-end Mineral Reserves 2018
Form 20-F 2017
Year-end Mineral Reserves 2017
Feasibility Study Report 2016
Form 20-F 2016
Year-end Mineral Reserves 2016
Year-end Mineral Reserves 2015
Subscription required - Subscription is required.

Aerial view:

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