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A perfect combination for Persenk Invest Ltd

Hitachi ZW310-6 wheel loader and ZX350LC-6 excavator

Efficiency of Bulgarian marble quarry proves value of Hitachi construction machinery

A BULGARIAN quarry is continuing to run efficiently thanks to the addition of two Hitachi Zaxis-6 excavators and ZW-6 wheel loaders to an expanding fleet of construction machinery.

Georgi and Ivan Georgiev, the father and son team at the Plovdiv-based Persenk Invest Ltd, bought the ZX350LC-6s and ZW310-6s after the confirmation of a three-year contract with the national Government’s power station, starting in September 2017.


The latest Hitachi medium crawler excavators replaced a pair of ZX350LC-3s. The first ZX350LC-6 – the first Zaxis-6 machine in Bulgaria – arrived at the Kurtovo Konare Quarry in April 2017, with the second delivered a year later.

The more recent acquisition moves blasted marble rock from the upper levels of the 100ha site on to the quarry floor, where 3,500 tonnes a day are loaded inn to the primary crusher by the other ZX350LC-6.

The crushed materials are moved by a ZW310-6 (delivered in December 2017) into two piles. They are then loaded periodically on to trucks that dump them into the feeding station for the secondary crushing and screening equipment.

The other ZW310-6 (delivered in September 2017) loads trucks in the stockyard with the finished products for onward transportation to the power plant (160km away) or other customer sites within a radius of 30km of the quarry. Between 45 and 70 trucks leave the quarry fully loaded twice every day, with 3,000 tonnes being sent to the power station alone.

Having established the company in 2009, Georgi Georgiev decided to buy a Hitachi wheel loader (ZW220) – which the company still owns – and an excavator (ZX280LC-3) in quick succession in 2011.

Today Persenk Invest also retain the services of a ZW310 wheel loader and ZX210LC-3 excavator, which, in addition to the new machines, help to produce 700,000 tonnes of material per annum.

The company has a 35-year permit for the site – with an option to extend for a further 15 years – and a team of 32 employees, who work in two shifts from 6am to 2pm and 2pm to 11pm.

‘Prior to purchasing our machines, we rented three different brands and tested them rigorously, which helped us to decide on Hitachi as the best option,’ said Georgi Georgiev. ‘We have dealt with Bulgarian Hitachi dealers Z&M ever since. There is a strong bond between our companies – through trust – and they provide us with an excellent after-sales service.

‘It’s about the whole package and Z&M are reliable partners for our business. This relationship is important to us and gave us the confidence to invest in new machinery after securing our contract with the power station.’

His son Ivan confirmed the importance of fuel economy to Persenk Invest: ‘The fuel consumption of our new Hitachi machinery is excellent and helps us to significantly reduce our running costs.

‘Both models are the optimum size for us, as they offer complete flexibility for our operations and can therefore deal with any fluctuations in demand – without the need to change the number of employees.’

The operator of the first Zaxis-6 in Bulgaria, Dimitar Georgiev, said: ‘The ZX350LC-6 is powerful and fast, as well as being easy to operate and enjoyable to work with. It is smoother than the previous model, which means that I am not as tired after a long shift.

‘The cab is also very comfortable and quiet – the best thing about this high-quality machine. It is perfect: stable, strong and well suited to the demands of a quarrying environment.’

Wheel loader operator Stoycho Guglev added: ‘The ZW310-6 is very fast for moving between the stockpiles and even more productive than the previous model. The joystick is effortless for steering, as well as being smooth to operate and easy to control the machine.

‘Loading is straightforward thanks to the traction force associated with the limited-slip differential, but the most impressive feature is the comfort in the cab, with ample space and a lack of noise.’


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