Tesmec’s surface mining technology has enabled a gypsum operation in South Australia to overcome a range of site-specific challenges.
An operator at a gypsum site in Penong, South Australia, faced a combination of geological and operational challenges.
Historically, the site had successfully excavated and crushed crystalline gypsum (selenite) without the use of blasting.
However, in a particular section of the deposit, this approach became unfeasible due to the hardness of the ore.
While limited blasting had occurred decades ago, it introduced added complexities, higher costs, and ore dilution.
Complicating matters further, this zone of hard ore sits just above a shallow and highly saline water table, necessitating selective mining of only the upper few hundred millimetres to avoid contamination and preserve product quality.
In search of a more efficient method, the operator evaluated various mining options. After extensive consideration, they engaged Tesmec to trial the 1150 EVO Rock Hawg, a machine specifically designed for selective surface mining. Following a successful trial, the operation invested in the unit and began full-scale production in April 2025.
A tailored mining solution
Tesmec developed the 1150 EVO Rock Hawg for use in bulk excavation, tunnelling, and continuous surface mining applications. This 60-metric-tonne-class surface miner can be equipped with either a 451hp (336kW) Tier 4/Stage V engine or a 440hp (328kW) Tier 3 engine. According to Tesmec Australia general manager Adrien Merceron, the 1150 EVO Rock Hawg offers exceptional productivity and adaptability.
“This model is available with a chainsaw, rocksaw, and dynamic drive attachment, making it ideal for a wide range of applications,” Merceron said.
“Operators benefit from a pressurised cabin with air conditioning, heating, and sound suppression. The cabin is fitted with ROPS and FOPS and includes security locks for added safety.”
The machine can operate in both up-cutting and down-cutting modes, depending on configuration. Standard features include a drum guard, cross conveyor, and track protection. Optional features allow further customisation. These include a water spray dust suppression system, remote control for maintenance, and trencher radio control.
Tesmec also provides cutting-edge technology solutions such as TrenchIntel, a smart tracker, and a laser-guided automatic system for depth control.
“TrenchIntel is a high-precision 3D GPS guidance system that enables automatic depth and grade control,” Merceron said.
“It autosteers along a predefined path, helping optimise every pass and enabling better fleet coordination. With TrenchTronic 5.0, operators can manage digging pressure, automate operation, and access remote diagnostics in real time.
“The monitoring system provides real-time machine data, operating conditions, and troubleshooting insights which is a big plus for fleet management.”
Efficiency delivered
The operator has achieved strong results since deploying the 1150 EVO Rock Hawg. Tesmec’s trial demonstrated the machine’s suitability for the site’s production requirements, making the decision to invest straightforward.
The ability to selectively mine the gypsum ore without disturbing the underlying saline material has significantly improved efficiency. The fragmentation achieved by the 1150 EVO has also eliminated the need for additional crushing, which in turn has reduced material handling and unit costs.
“This performance shows that the 1150 EVO Rock Hawg is an efficient solution for selective mining,” Merceron said.
“The ability to extract shallow, hard material with precision has delivered significant operational benefits for the customer.
“Tesmec is proud to have collaborated with the operator to deliver a solution that aligns with their goals and production demands.” •
For more information, visit tesmec.com.au
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