Profiled are just some of our projects undertaken over the years

Mining Projects

Domestic Projects
CLIENT: Palabora Mining Company (Pty)
COMMODITY: Copper
STATUS: Completed
SCOPE OF WORKS
Transition mining operations from open pit to underground by adding two vertical shafts to the largest open pit copper mine in Africa
Underground development – crusher chambers, production levels
PRODUCTION SHAFT:
Depth: 1291 meters
Finished diameter: 8 meters
Equipped with four 30-ton capacity skips, able to hoist 30,000 tonnes per day
SERVICE SHAFT:
Depth: 1275 meters
Finished diameter: 10.5 meters
SPECIAL ACHIEVEMENTS AND CHALLENGES
Successful transition from open pit to underground thereby extending the life of mine
36 months LTI free on production
At the time:
•         The production shaft has the tallest headgear in the world at 107 meters
•         30,000 tonnes per day hoisting capacity was one of the highest tonnages in the world to be hoisted through a single lift shaft
CLIENT: Royal Bafokeng Platinum
COMMODITY: Platinum
STATUS: Completed
SCOPE OF WORKS
Simultaneous construction of a twin shaft complex with associated 3 level station and level development, infrastructure development and equipping to cater for 250kt per month at steady state production
The scope entailed the main shaft intersecting the three levels, namely 600 level for production, 642 ore transfer level which is also top of silo and settlers (water handling) and 708 level as the loading level where ore is  finally transferred to the main shaft for hoisting to surface.
MAIN SHAFT:
Depths: 758
Finished diameter: 9m
SERVICE SHAFT:
Depth: 721
Finished diameter 6.5 m
SPECIAL ACHIEVEMENTS AND CHALLENGES
The 600-level reef intersection was achieved ahead of schedule and both shafts where completed on time. The simultaneous development of three levels proved to be a major challenge due to limited hoisting capacity of the services shaft whilst the main shaft was being completed and readied for stripping and equipping.
CLIENT: Impala
COMMODITY: Platinum
STATUS: Completed
SCOPE OF WORKS
Sinking of a three-shaft complex – main shaft; ventilation shaft and Bulk Air Conditioning (refrigeration shaft)
Ancillary development and construction
MAIN SHAFT:
Depth: 1932 metres
Finished diameter: 10 meters
VENTILATION SHAFT:
Depth: 1764 metres
Finished diameter: 9.5 metres
REFRIGIRATION SHAFT:
Depth: 1432 metres
Finished diameter: 6 metres
SPECIAL ACHIEVEMENTS AND CHALLENGES
One of the biggest sinking projects yet undertaken in the southern hemisphere at the time – simultaneous sinking of three shafts
Sinking through hard rock.
At the time this was the tallest steel headgear in South Africa designed by sister company METS
CLIENT: Impala
COMMODITY: Platinum
STATUS: Completed
SCOPE OF WORKS
Sinking of two shafts with ancillary development
Equipping of main shaft
MAIN SHAFT:
Depth: 1665 metres
Finished diameter: 10 metres
VENTILATION SHAFT:
Depth: 1390 metres
Finished diameter: 6.8 metres
SPECIAL ACHIEVEMENTS AND CHALLENGES
Both shafts were sunk simultaneously
Very high safety standards were achieved
Sinking through hard rock and extensive aggressive water bearing zones
At the time this was the tallest concrete headgear in South Africa
CLIENT: Impala
COMMODITY: Platinum
STATUS: Completed
SCOPE OF WORKS
Sinking of a ventilation shaft with ancillary development and equipping of shaft
Depth: 1451 meters
Finished diameter: 5.6 meters
SPECIAL ACHIEVEMENTS AND CHALLENGES
New safety standards were achieved for a sinking contract at that time. No LTI’s were recorded during this project.
CLIENT: ILonmin Platinum Mines (Pty) Ltd
COMMODITY: Platinum
STATUS: In Progress
SCOPE OF WORKS
Sinking of decline shaft with further level development including infrastructure for declines – silos, settlers, conveyors, bulkheads
On-reef development and ore handling
SPECIAL ACHIEVEMENTS AND CHALLENGES
Shaft Sinkers has been on site with Lonmin for a period of 18 years undertaking contracts for K3, Hossy and Saffy shafts
+/- 235 000 m3 of decline shaft and horizontal development
CLIENT: Lonmin (Pty) Ltd
COMMODITY: Platinum
STATUS: Completed
SCOPE OF WORKS
Sinking and equipping of a main production shaft
Development of three declines
Ancillary development
MAIN SHAFT:
Depth: 410m
Finished diameter: 6m
DEVELOPMENT:
31 000 m³
SPECIAL ACHIEVEMENTS AND CHALLENGES
Shaft Sinkers was on site with Lonmin for 18 years working on the clients Hossy, K3 and Saffy shafts
Mechanise development was introduced for certain aspects of the contract
CLIENT: Lonmin (Pty) Ltd
COMMODITY: Platinum
STATUS: Completed
SCOPE OF WORKS
Sinking and equipping of a man & materials shaft
Ancillary development
Mechanised development
MAIN SHAFT:
Depth: 930 meters
Finished diameter: 8.1 meters
DEVELOPMENT:
31 000 m³
SPECIAL ACHIEVEMENTS AND CHALLENGES
Shaft Sinkers was on site with Lonmin for 18 years working on the clients Saffy Hossy, and K3 shafts
Shaft Sinkers simultaneously carried out a deep pre-sink to a depth of 132 meters whilst the sliding of the concrete headgear took place together with the installation of all sinking steelwork and associated infrastructure.
The project was delivered three months ahead of schedule and under budget
Exceptionally high quality sinking and equipping delivered to client
CLIENT: AngloGold Ashanti
COMMODITY: Gold
STATUS: Completed
SCOPE OF WORKS
Over a period of 12 years the following contracts were completed at Moab Khotsong:
•        Sinking of the production shaft to a depth of 2300 meters, followed by further sinking of the sub-level RV Shaft for an additional 1349 meters, taking the shaft system to a total depth of 3649 meters.
•         Rock ventilation silo slipping, supporting and shaft equipping
•         Construction of the 64 level backfill chamber
•         Batch plant operations and maintenance
•         Excavation of various silos and ore passes.
•         Vent bypass development and sinking
•         Construction of ore pass supports on levels 85, 88, 92, 95, 100
•         Development on levels 64, 70, 85, 88, 92, 95, 98, 101
SPECIAL ACHIEVEMENTS AND CHALLENGES
We were involved with the mine over a period of 12 years
Together with Western Deep this was amongst the deepest shafts ever sunk
Moab Khotsong presented one of the most difficult and fragmented ore reserves to mine.
Shaft Sinkers production crews did development at production rates far exceeding industry production standards
CLIENT: Anglo American
COMMODITY: Zinc/Copper
STATUS: Completed
SCOPE OF WORKS
Sinking of main shaft
SHAFT DIMENSIONS:
Depth: 1752 meters
Finished diameter: 7.4 meters
SPECIAL ACHIEVEMENTS AND CHALLENGES
Remoteness of the site required careful logistical planning
The sinking project had to overcome significant geotechnical challenges by way of high horizontal stresses
CLIENT: Hernic
COMMODITY: Chrome
STATUS: Client curtailed the project before completion of the full scope of works
SCOPE OF WORKS
Construction of a twin decline system to open up reef development to produce 120kt per month of stoping
SPECIAL ACHIEVEMENTS AND CHALLENGES
High safety standards were achieved
This was a well-executed project that exceeded client expectation in terms of quality
CLIENT: Afplats (Pty) Ltd
COMMODITY: Platinum
STATUS: Project was stopped by client
SCOPE OF WORKS
Various sinking activities undertaken within the Afplats Leeuwkop facility, including:
Sinking of the main shaft and ancillary development
Box cut for the vent shaft
MAIN SHAFT:
Depth: 1581 meters
Diameter: 10.2 meters
DEVELOPMENT:
31 000 m³
SPECIAL ACHIEVEMENTS AND CHALLENGES
An excellent safety record was achieved over the period of the project
CLIENT: Aquarius Platinum
COMMODITY: Platinum
STATUS: Completed
SCOPE OF WORKS
Development of the mine through the simultaneous sinking of 5 declines plus a vertical ventilation shaft.
Trackless production mining planned at 200 000 tonnes per month
SPECIAL ACHIEVEMENTS AND CHALLENGES
The layout of conveyors and feeders to remove rock was very well planned and installed.
Sinking of 5 declines in very close proximity to each other provided logistical and coordination challenges that were well managed
International Projects
CLIENT: RandGold; AngloGold Ashanti; DRC
COMMODITY: Gold
STATUS: Sinking and equipping completed
Currently completing underground construction and shaft manning
THREE PHASE SCOPE OF WORKS:
1.      Shaft sinking and early development
2.      Shaft equipping, winder installation, rope up and commissioning
3.      Shaft manning, underground construction, including electrical and mechanical installations
MAIN SHAFT:
Depth: 760m
Finished diameter: 7 meters
SPECIAL ACHIEVEMENTS AND CHALLENGES
Project was delivered 77 days ahead of schedule and within budget due to the following innovative project approach:
‘Owners team’ approach between all stakeholders resulting in seamless project execution
ATC contract with upfront agreed milestones targets and costs
CLIENT: Vedanta Group / Hindustan Zinc Limited
COMMODITY: Zinc
STATUS: Completed sinking of all 3 shafts.
Currently in equipping phase and preparing for post equipping development phase
SCOPE OF WORKS
Moving from an open cast to underground mine.
Development of a complete underground mine design in conjunction with sister company METS.
The sinking of three shafts; a rock and materials main shaft and two ventilation shafts.
Equipping of main shaft; winder installation, roping up and commissioning.
Off-shaft development including silos, crusher chambers, ore passes and tipping arrangements.
Underground civil works for various structures together with installation of mechanical and electrical components
ROCK AND MATERIAL SHAFT:
Depth: 955m
Diameter: 7,5m
NORHT VENT SHAFT:
Depth: 497m
Diameter: 7,5m
SOUTH VENT SHAFT:
Depth: 407m
Diameter: 7,5m
SPECIAL ACHIEVEMENTS AND CHALLENGES
Providing the client with a front to end solution from mine design to execution in moving from open cast to underground operations.
Moving through hard rock with extensive aggressive water bearing zones
Experience as a multinational operating in India.
Well established supply chain base enabling us to penetrate the broader Asian region.
Significant plant, equipment and human capital availability to undertake projects in the Asian region.
CLIENT: PT Tambang
COMMODITY: Gold
STATUS: Completed
SCOPE OF WORKS
Sinking of a main shaft
Ancillary development
SHAFT DIMENSIONS:
Depth: 320 meters
Finished diameter: 6.2 meters
SPECIAL ACHIEVEMENTS AND CHALLENGES
The project was situated on the top of a mountain thereby providing unique logistical challenges  in getting equipment and materials to site.
Helicopters were used to transport all equipment and materials to the site.
The top of the mountain had to be levelled before sinking could commence.

Tunnelling and Hydro Projects

Domestic Projects
CLIENT: Eskom and Department of Water Affairs
COMMODITY: Water
STATUS: Completed in 1982
SCOPE OF WORKS
Sinking of two vertical pressure shafts and excavation of two pressure tunnels
Excavation of underground caverns, machine hall, valve hall, transformer hall and surge chambers
Construction of all foundations
SHAFT DIMENSION:
Depth: 460 meters
Finished diameter: 16 meters at surge potion 6 meters for shaft
PRESSURE TUNNELS:
length: 1500 meters
Diameter: 6 meters
MACHINE HALL:
Width: 16 meters
Height: 45 meters
Length: 200 meters
SPECIAL ACHIEVEMENTS AND CHALLENGES
1 of 5 pump storage scheme projects undertaken worldwide at the time.
1 million3 of rock excavated
250 000 m3 of concrete poured
Widest diameter shaft mouth sunk at the time.
Largest underground chamber in South Africa
Innovative execution techniques were pioneered to excavate the pressure tunnels though ground that had high horizontal stresses. Final lining of the pressure tunnels were pre-stressed using the ‘Manchette System’ and high pressure grout
The accuracy achieved on tolerances before the advent of new digital technology was below 50mm and was commendable.
CLIENT: National Roads Department (NRTA)
STATUS: Completed
SCOPE OF WORKS
Construction of the initial 175-meter west entrance portal of the road transport tunnel done in 5 sections of 35 meters each.
Tunnel diameter: 16 meters
SPECIAL ACHIEVEMENTS AND CHALLENGES
This was very technically challenging project:
•         Owing to the completely weathered and waterlogged ground conditions the consortium adopted ground freezing measures to stabilise the ground during construction of the initial 165 meters of the tunnel entrance. A 2-meter thick zone around the tunnel perimeter was frozen to minus 10°Celsius to provide temporary support prior to installing a 500mm thick shotcrete, weldmesh and steel rib final support.
•         Extensive R&D was undertaken to prove that shotcrete could be effectively used on frozen surfaces.
CLIENT: National Roads Department (NRTA)
STATUS: Completed in 1975
SCOPE OF WORKS
12.8 X 8.2-meter lined tunnel excavated through extremely fragmented and unstable rock conditions.
SPECIAL ACHIEVEMENTS AND CHALLENGES
In this project, the application of a ‘Masterarch and Spiling System’ was pioneered to stabilise excavations taking place in highly unstable ground conditions. This proprietary methodology is used to this day on some of our projects.
International Projects
CLIENT: India Energy Infratech
COMMODITY: Hydro Scheme
STATUS: Completed
SCOPE OF WORKS
Sinking of two pressure shafts
Development of 112 meters of excavations
SHAFT DIMENSION:
Depth: 650 meters (wetcrete lined)
Finished diameter: 5.5meters
DEVELOPMENT:
5000 m³
SPECIAL ACHIEVEMENTS AND CHALLENGES
The location in the Himalayas created unique logistical challenges due to severe road limitations as well as seismic events.
Due to severe road restrictions, the size of equipment that could be deployed was very limited.
Despite this, crews achieved 112 meters of sink in one month
Project was LTI free
CLIENT: Alp Transit / GBTS Ingenieursgemeinschaft / Electrowatt Engineering AG
STATUS: Completed
SCOPE OF WORKS
Sinking of an emergency access and services shaft from within an added underground cavern at 1000 meters into the mountain.
Excavation for the underground station
SHAFT DIMENSION:
Depth: 820 meters
Finished diameter: 8.5 meters
UNDERGROUND EXCACATION:
Height: 14 meters
Width: 19 meters
Length: 120 meters