The limestone with size (3-4mm) for feed industry is exploited directly from the Mong Son white stone-pit in Yen Binh district, Yen Bai province by blasting method. And then the material is washed and put into the jaw crusher and hammer crusher. The raw material was inspected again under supervision of operators, warehouse-keeper and KCS staff before being producted.
The qualified stone for production is not curbstone, no soil, no impurities and the size <30CM x 35CM x 40CM. Raw material is crushed preliminary by the jaw and hammer crusher system and then through the roller flight conveyor system to put into the sieving system to make good with required size - (3-4) MM