The goal of the study was to reduce the ash content of high ash non-coking coal from Talcher coalfield in Odisha, India. The researchers used a combination of gravity separation and flotation techniques to clean the coal. The key findings were that they were able to produce clean coal with 23.3% ash at 49.7% yield, an intermediate clean product with 30.9% ash at 12.1% yield, and a reject with 49.8% ash at 38.2% yield.