instrumentationinsulatorintact rockintakeintegral drill steelintegral multiple reductioninter coolerinteractionintercept timeinterferometerintermediate haulageintermediate zoneintrinsic magnetic inductionintrinsic permeability coefficientintrinsically safeinvaded zoneion complexion exchangeionosphereiron hatirrotational deformationisocandle curvesisochemical metamorphismisochoric processisocline foldisoclinic contourisogas curveisogonic contourisolineisoline methodisomagnetic contourisothermal process