core orientercore recoverycorona glowcorrelationcorrelation coefficientcorrosioncoulter countercountercurrentcountry rockcouplingcoupling factorcovariancecovariogramcratercratoncrawler trackcreepcreep rupturecrenulation cleavagecrest linecribbingcritical anglecritical diametercritical speedcross armcross beddingcross belt magnetic separatorcross cutcross sectional methodcross type bitcrown pillarcrushabilitycrushed rockcrushercrushingcrushing zonecrustculvertcumulative probabilitycurie pointcushion blastingcutcut and covercut and fill stopingcut off gradecut pointcutter headcutter loadercutter pickscutting rate