The methods of starting Aircore Drilling that are used are mechanical methods and with perforation and blasting. The selection of the starting method depends on the physico-mechanical characteristics of the rocks.
In the quarry the open-pit mode is used and the starting method used is drilling and blasting. During the use of this method, the drilling process, the value of the explosive substances and the means of explosion exert the greatest influence on the increase in costs. In order to minimize the costs associated with this starting method, the passport and blasting passport parameters must be controlled very well in order to reduce the oversized rocks output to allowable levels and at the same time to minimize the start-up cost.
In the case of the deposit, the volume of oversized rocks obtained during the start-up with blasting exceeds 10%, a value considered high in the current working conditions.