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The paper discusses the mechanical properties of waste-derived briquettes, their ignition and combustion behavior, and emissions. The briquettes based on coal slime blended with straw/peat/sawdust/waste compressor oil were used. 100% Coal slime and 100% biomass briquettes were reference cases. The proportion of coal slime in the multi-component briquettes was at least 85%. The samples were tested on a laboratory scale. Briquettes based on coal slime and used oil were characterized by moisture resistance and high energy performance indicator, yet they were brittle. Starch improved their impact resistance considerably. However, when added to mixtures of coal slime and straw, starch led to greater destruction of initially rather strong briquettes. The addition of starch slightly increased the water absorption characteristics of all the samples during storage. The ignition temperatures of briquettes of different compositions ranged from 350 to 610 °C. The briquette ignition characteristics tended to worsen when starch was added. A multi-criteria evaluation of fuels, considering cost, ignition, combustion behavior and emissions, as well as mechanical properties, showed that the highest efficiency is typical of 100% sawdust briquettes. For the fossil fuel briquettes, the best synergistic effect resulted from the combination of 90% coal slime and 10% straw. The “coal slime-peat-starch” is an undesirable combination, because it reduces the efficiency indicators for all the categories considered and makes the fuel more expensive.