Vale Tailings Storage Facility

The Vale Tailings Storage Facility in Tete, Mozambique was awarded to WBHO on 3 June 2013 and work commenced on 3 July 2013. The majority of the work is bulk earthworks with over a million cubic metres of fill material required for the northern embankment dam wall. There are also slot drains of 2.8 km and a spillway consisting of more than 5000m³ of gabion stones.

Contract duration:
July 2013 - June 2014

Contract value:
USD 17.5 Million

Engineers: 
Golder Associates

Client:
Odebrecht

Contractor:
WBHO Projects-Mozambique Limitada

Location:
Tete, Mozambique

Magugu Dam

EMPLOYER
Komati Basin Water Authority (KOBWA)

CONSULTANT
MDJV (Ninham Shand, Keeve Steyn, Steffen Robertson & Kirsten & ZMCK)

YEAR COMPLETED
2001

VALUE AT COMPLETION
R420M

LOCATION
Swaziland

PROJECT TYPE
Dams

DESCRIPTION
Piggs Peak and Swaziland.Construction involved the following: Construction of the Maguga Dam, 6 million m3 of Earthworks, 2 tunnels (8m x 7m) & (8mx9m) & ±400m long, 225m long Road bridge over spillway,102m high 12 m ø Intake Tower, Rock Bolting & Shotcreting, Drilling & Grouting, Drill & Blast, Crushing, 120 000m3 concrete.



Massingir Dam

EMPLOYER ARA-SulCONSULTANT Coyne Et Bellier YEAR COMPLETED 2005 VALUE AT COMPLETION US$ 35M LOCATION Mauritius PROJECT TYPE Dams DESCRIPTION Construction involved the following: Stabilising Berm:Excavation of existing material 110,000 m3, Forming Berm with F2 type material 42,000 m3, Forming Berm with D1 type material 21,000 m3, Forming Berm with R2 type material 79,000 m3. Drilling and Grouting Dam Foundations: Exploratory Holes, Setting up 96 no. Drilling holes in earthfill 42,500m, Comprehensive Water Pressure Test 650 no ; Drilling of Grout Curtain - Setting up 1,200 no. - Drilling holes in earthfill 42,500 m - Drilliing holes in dam foundation 50mm less than 50mm dia. 19,000 m - Drilling holes in dam foundation 50mm, 80mm – 50mm to 80mm dia. 9,900 m;Recording drilling parameters 35,000 m; Extra cost for “tube-a-manchettes” 7,000 m; Setting up for foundation grouting 1,300 no; Downstage Grouting 3,150 stage; Upstage Grouting 6,350 stage.Repair of Dam Upstream Slope Rip Rap: Breaking of larger existing blocks 156,000 m3; Re-Use and dress on the spot 38,000 m3; Placing of Transition layer 33,200 m3; Placing of Rip rap layer 135,000 m3. Parapet Wall on Dam Crest: Concrete for Foundation 20/30 mix 1,700 m3; Prefabricated concrete elements 6,150 m3; Supply and placing of reinforcing steel 430,000kg.

Nacala Dam

PROGRESS
We are progressing well with the contract and will complete it in the next few months. It has been an incredible journey from an international expat team that includes no less than 9 different nationalities. The $36 million project funded by Millennium Challenge Account (MCA) includes 2 bridges, a concrete spillway, pump house, earth dam and a new surfaced road. We are in talks with MCA for further work in the Nacala area, a true testament to the quality of work our WBHO team has produced.

This Northern Mozambican project has had more than its fair share of challenges but the team has taken them in their stride, growing in confidence after every success.

EMPLOYER
MCA-Mozambique (Millennium Challenge Account)

ENGINEERS
Jaffares & Green

VALUE AT COMPLETION
+- $30million

LOCATION
Mozambique

PROJECT TYPE
Power

DESCRIPTION
2 bridges, a concrete spillway, pump house, earthen dam and a new surfaced road

Rehabilitation of Nacala Dam

EMPLOYER
Millennium Challenge Account – Mozambique

CONSULTANT
Jeffeares & Green

YEAR COMPLETED
2013

VALUE AT COMPLETION
US$ 35,500,000.00

LOCATION
Mozambique, Nacala

PROJECT TYPE
Dams

DESCRIPTION
Nature of work involves the following: Establishment of camp and plant on site Accommodation of traffic on public roads Construction of the following: Road works & Bridges Earth Dam and Concrete Dam Walls Retaining Walls Spillway Structure Outlet Pump house Mechanical & Electrical Services Dealing with water, the existing dam will not be drained but levels are to be lowered accordingly throughout the contract Maintenance of the works.

Ingula Dams

EMPLOYER
Eskom

CONSULTANT
Bramhoek Dam Consultants JV

YEAR COMPLETED
2010

VALUE AT COMPLETION
R980M

LOCATION
South Africa, KwaZulu Natal

PROJECT TYPE
Dams

DESCRIPTION
Construction work involved the following:The Ingula Pumped Storage Scheme is proposed as a pumped storage project with a capacity of 1333MW and an energy storage capacity of 21000MWh. DESCRIPTION:Braamhoek:RCC Dam approximately 335m long and 39m high, Free crest spillway with crest length of 40m over RCC dam, Lower dam – roller compacted concrete dam 35m high, reservoir total 26.7 MCM, active storage of 19.1 MCM.Bedford: River diversion works consisting of channels, a cofferdam and training wall;480m embankment with 170m Long clay core embankment extension, 48m Long single span bridge, 42m dry well single-level intake tower, Upper dam - concrete faced rock fill embankment dam 49m high, reservoir total 22.4, MCM, active storage of 19.1 MCM.

Orapa Services Dam (MotoCross)

EMPLOYER
Debswana Mining Company

CONSULTANT
Knight Piesold (Design and Build)

YEAR COMPLETED
2009

VALUE AT COMPLETION
P60M

LOCATION
Botswana

PROJECT TYPE
Dams

DESCRIPTION
Construction work involved the following: Transfer Dam: Capacity 370 000 m3 below ground level,Main Storage Dam: Capacity 570 000 m3 above ground level, Blasting: 250 000 m3, Dam walls:350 000 m3,Spillways,2 Pumpstation,Dam Linings,Concrete Side Drains, Fencing.

Bergriver dam project

EMPLOYER
TCTA

CONSULTANT
Berg River Consultants

YEAR COMPLETED
2007

VALUE AT COMPLETION
R480M

LOCATION
South Africa, Cape

PROJECT TYPE
Dams

DESCRIPTION
Construction work involved the following: Rockfill Dam Wall with Upstream Cncrete facing Height 60m Length 980m. Earthworks: Clearing 600ha, Excavation 400,000m3, Rock Excavation 200,000m3, Rockfill 3,400,000m3, Filters 160,000m3; Concrete: General 20,000m3, Intake 20,000m3, Facing 60,000m3, Spillway 20,000m3; Grouting: Consolidation 50,000m, Curtain 25,000m, River diversion works, Steel Pipes 600m 1.5mdia, Gallery Lighting, Instrumentation.

Ntimbale Dam

EMPLOYER
Dept. of Water Affairs, Botswana

CONSULTANT
Knight Piesold

YEAR COMPLETED
2005

VALUE AT COMPLETION
R69M

LOCATION
Botswana

PROJECT TYPE
Dams

DESCRIPTION
Construction involved the following: Roller Compacted Concrete: Height 33m, Length 155m, Clearing 105ha, Excavation 6500m3, Rock Excavation 8000m3, RCC 33000m3, Concrete 1850m3, Spillway Concrete 1650m3, Drill & Grout 2500m, Steel pipes 150m, Gallery lighting, Instrumentation; Rockfill with clay core: Height 20m, Length 190m, Clearing 7ha, Excavation 31000m3, Rock Excavation 7300m3, Clay core 36500m3, Filters 16000m3, Rockfill 65000m3, Concrete 1850m3,Drill & Grout 1650m, Instrumentation. Saddle Dams: 3no. 3500m3, River diversion works.

Paris Dam

EMPLOYER
Impala Irrigation Board

CONSULTANT
BKS Engineers & Bosch Associates

YEAR COMPLETED
2000

VALUE AT COMPLETION
R130M

LOCATION
South Africa, KwaZulu Natal

PROJECT TYPE
Dams

DESCRIPTION
Construction involved the following: Construction of Dam wall and Associated works, Double Curvature Arch Dam Wall - 70m in height, Intake Structure, Outlet Works, Aprons.