1.Rock Drilling Eccentric Overburden Casing System ke mokhoa oa kajeno o ratoang oa ho cheka maemong a thata a fatše, mohlala, moo ho nang le majoe kapa libopeho tse hlephileng.Eccentric casing drilling system ke tharollo ea moruo ka ho fetesisa hobane lepheo la eona le bohlale la ho tsosolosa lepheo le ka khutlisoa le ka sebelisoa lesobeng le latelang.Sena se etselitsoe likoti tse sa tebang, joalo ka ha ho etsoa hangata ha ho cheka liliba tsa metsi, liliba tsa mocheso oa mocheso le mosebetsi o sa tebang oa ho bokellana.EDS e loketse masoba a makhutšoane a boima bo kopaneng.