Quarry Southern Africa May 2019 - Page 21

WINNING Decommissioned Chinese equipment. “We train our operators to be as efficient as possible.” there to an intermediate stockpile. From there it is fed by a conveyor belt to a triple- deck screen. The triple deck screen does the following splits: • -8mm stockpiled as scalping sand • +34mm oversize sent to a cone crusher coupled in a closed loop circuit • +8mm to -34mm sent to the Teqroc T8R VSI. “Downstream from the VSI there are various screens stockpiling 22mm, 13.2mm, 6.7mm, and -5mm crusher dust, all being shaped material,” says Botha. The company invested in a washing facility in 2017 to wash crusher sand to meet local demand. Each stockpile conveyor belt has a wash box to wash the course aggregate before it falls on the stockpiles. The aggregate falls on the shaker and gets washed with high-pressure www.quarryonline.co.za  sprays. Water for washing and other needs comes from two boreholes, with as much as 90% being recycled, as water is scarce in the region. Ever growing demand requires increased production “We’ve ordered another VSI from about the middle of this year,” says Van Waveren. “We are generating an enormous amount of sand, and overall our production is higher than our sales (except for at this exact moment in time) and we are looking to break into the rooftile industry to sell finer 4mm sand washed.” Its biggest market by far is the concrete industry, delivering to customers such as Corestruc for precast concrete products (less than 1km away), 3Q readymix, and Technicrete for paving bricks. Botha says the mine produces on average of about 23 000t per month with a single shift but at the moment demand is peaking at about 30 000t per month. With that being higher than production, stockpiles are running low and the quarry is in need of the additional equipment. A Metso GP300 cone crusher to slot in-between the jaw and the intermediate stockpile is on order and a second eight-hour shift is being planned to boost production. The reason for its present underinvestment in production has been the lack of a mining licence, which has only in February been remedied, he explains. “There is never a guarantee that you get a mining right from DMR, so it was a bit of a gamble going into production. We weren’t prepared to invest more until we received it. So, February is when we started with our plans to upgrade.” Botha outlines the equipment: “On the mining side, we do drilling and blasting to break the rock as the cheapest means of doing so — using outsourced contractors.” Loading and hauling is done with two Hitachi excavators and three Bell ADTs, and delivery to clients is done by Alpha Sand via its fleet of 8x4 tipper trucks. Delivery is primarily restricted to the Polokwane area. All the plant and equipment on the quarry is hired from Alpha Sand. It also has two hydraulic rock breakers, one water bowser, a fleet of five front-end loaders, and a mobile QUARRY SA | MAY/JUNE 2019_19