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South Africa
Kriel Mine

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 Location:
13 km NW from Kriel, South Africa

  Address:
Ogies and Bethal
Ga Nala (Kriel)
South Africa
2271
Phone  ...  Subscription required
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  • Overview
  • Owners
  • Geology
  • Mining
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Coal (thermal)
Mining Method
  • Truck & Shovel / Loader
  • Dragline
  • Bord-and-pillar
Mine Life2029


Owners

Source: p. 1,2
CompanyInterestOwnership
Seriti Resources Holdings Proprietary Ltd. 90 % Indirect
Seriti Coal Pty Ltd (operator) 100 % Direct
Seriti Resources Holdings Proprietary Ltd. acquired the Kriel mine from Anglo American in March 2018.

Seriti Resources Holdings Pty Ltd (‘Seriti’) is a broad based, 91% black owned and controlled South African mining company co- owned by four black anchor shareholders, Masimong Group, Thebe Investments, Zungu Investments (Zico) and Community Investment Holdings (CIH). Seriti Coal Community Employee, and Management Trusts own 10% of the Seriti Resources Holdings Pty Ltd.

Seriti, through its operating subsidiary, Seriti Coal Pty Ltd, operates three large- scale, opencast and underground thermal coal mines namely, New Vaal, New Denmark and Kriel Collieries.

Deposit Type

  • Sedimentary


Summary:

The Highveld Coalfield in the Mpumalanga Province of South Africa is situated on the northern part of the main Karoo Basin. The Karoo Supergroup can be divided into the Dwyka, Ecca, Beaufort, Stormberg and Drakensberg Groups.

The Highveld Coalfield is underlain by a thin sequence of Dwyka and Middle Ecca strata lying on an undulating floor composed of felsites, granites, and diabase associated with the Bushveld Complex.

The Vryheid Formation of the Ecca Group, where the coal occurs, conformably overlies the tillite with minor conglomerates, sandstones, shales and coal. In the Highveld (and Witbank) coal fields, the glacial deposits of the Dwyka Group are directly overlain by rocks of the Vryheid formation, as the Pietermaritzburg formation is absent in these coal fields. The overlying Volksrust Formation is also either not developed or completely eroded away in the central Mpumalanga coal fields.

Pre-Karoo dolerites have greatly intruded the geological sequence of the Highveld Coalfield. There are two main dolerite sills in the coalfield, with more extensive thinner sills 1.5 m to 15 m thick. Where a dolerite sill has intruded, the seam is faulted, resulting in a vertical throw ranging from 6 to 25 m.

A major dolerite sill of up to 14 m is generally situated below the No. 2 seam in the Pit 4, 23 and 23 extension areas.

The basin depth is approximately 300 m, with the coal zone approximately 70 m thick. Five major coal seams occur in the Highveld, numbered from the bottom upwards, No. 1, 2, 3, 4, and 5. The coal seams are generally described as follows:
- No.1 Seam is thin and mainly discontinuous
- No.2 Seam is approximately 1.5-4 m
- No.3 Seam is thin and discontinuous
- No.4 Seam is 1-12 m, laterally continuous
- No.4 Upper Seam is 1-4 m thick and is separated from No.4 Lower Seam which is 4-12 m thick by sandstone
- No.4A Seam occurs above the No.4 Upper Seam
- No.5 Seam is 1-2 m thin.

The Kriel Colliery reserves are situated on the northern margin of the Highveld coalfield. The majority of the coal mined at Kriel Colliery is from the No.4 Seam. The total thickness of the No.4 Seam in the Kriel coal field is generally between 4 and 5 m thick, where the top seam attains a thickness of 1.5 to 2 m. The No 4 seam is regionally overlain by a thick interlaminated shale-sandstone/siltstone and underlain by a typical white Ecca sandstone layer. Glauconitic sandstone, indicative of transgressive marine periods, is present above the Nos. 4 and 5 coal seams, forming useful stratigraphic markers.

Proven coal reserves in the Kriel Coalfield are the No 2, 4 and 5 seams, but only the No 4 seam is economically extracted. The coal is ranked as low-grade bituminous steam coal and the depth of the coal seam ranges from 6 m to 85 m below the ground. All coal historically and currently produced is dedicated to the Kriel Power station.


Mining Methods

  • Truck & Shovel / Loader
  • Dragline
  • Bord-and-pillar


Summary:

The colliery uses mechanised bord-and-pillar methods to mine the underground operation, and its opencast operation uses draglines as well as truck-and-shovels.

Board and pillar mining is typically used for flat or gently dipping bedded ores or coal seams. Once the coal seam has been accessed, the ore is mined utilising a regular grid of mining tunnels and involves progressively excavating panels into the coal seam whilst leaving behind pillars of coal to support the mine. The coal is then removed in a regular pattern while the rooms are mined out through the tunnels by drill and blast methods or a Continuous Miner and deposited onto a conveyor. The open chambers remaining following coal removal is referred to as a stope. The remaining coal contained within the pillars may be won at closure by a retreating system, starting at the farthest point from the stope access, allowing the roof to collapse and fill in the stope. This allows a greater recovery as less ore is left behind in pillars.


Crushing and Grinding


Processing



Production:
Kriel mine was acquired from Anglo American in March 2018 by Seriti Resources Holdings Proprietary Ltd.

2018 full year production numbers have not been reported.

CommodityUnits202020192017201620152014
Coal (thermal) Mt  ......  Subscription required  ......  Subscription required5.46.36.26.9
All production numbers are expressed as ROM coal.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019
Raw coal annual capacity 5 Mt

Reserves at December 31, 2017:

CategoryOreTypeTonnage Commodity
Proven In-Situ (OP) 1.7 Mt Coal (thermal)
Proven In-Situ (UG) 4.7 Mt Coal (thermal)
Probable In-Situ (UG) 16 Mt Coal (thermal)
Proven & Probable In-Situ (OP) 1.7 Mt Coal (thermal)
Proven & Probable In-Situ (UG) 20.8 Mt Coal (thermal)
Proven & Probable Total 22.5 Mt Coal (thermal)
Measured & Indicated In-Situ (OP) 59 Mt Coal (thermal)
Measured & Indicated In-Situ (UG) 75.5 Mt Coal (thermal)
Measured & Indicated Total 134.5 Mt Coal (thermal)


Heavy Mobile Equipment as of August 12, 2021:
HME Type
Dragline

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Press Release 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Other 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Year-end Mineral Reserves 2015
Other 2014
Other 2012
Other 2011
Corporate Presentation 2010
Other 2010
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Aerial view:

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