Oil shale waste rock aggregate properties which are depending on content of oil shale

The commercial bed of Estonian oil shale kukersite consists in addition to oil shale also limestone layers and concretions which decrease the quality of oil shale. In order to get the required calorific value 8.4 – 11.4 MJ/kg the oil shale is extracted selectively, high-selectively or the oil shale is separated from run of mine in separation plant.