Nickel ni ibikoresho by'ibanze by'ibyuma bidafite ingese kandi bingana na 50% by'igiciro cyose.ikigezweho…
Ibyuma bya karubone ni uruvange rwa karubone nicyuma hamwe na karubone igera kuri 2,1% kuburemere.Kwiyongera mubirimo bya karubone byongera ubukana nimbaraga zicyuma, ariko bikagabanya guhindagurika.Icyuma cya karubone gifite ibintu byiza mubijyanye nubukomezi nimbaraga kandi bihenze kuruta ibindi byuma.
Imiyoboro ya karubone idafite imiyoboro ikoreshwa cyane mu gushyiramo ingufu za kirimbuzi, kohereza gaze, peteroli, inganda, kubaka ubwato, amashyiga n’izindi nganda, hamwe no kurwanya ruswa nyinshi hamwe n’imashini nziza.