Coal is one of the world's primary energy sources and fourth in the world for exports is Colombia. Over 80 million tons were exported in 2019, primarily to produce electricity [1]. New commercial applications that take advantage of the exceptional characteristics of graphene materials are emerging quickly. However, current techniques for producing graphene are ineffective, expensive, and do not offer a viable supply to satisfy anticipated future demand. In this way, the production of graphene oxide (GO) by means of the Liquid Phase Exfoliation (LPE) method using high-rank coal from Boavita (Colombia) as the raw material was developed. In order to establish a suitable protocol, the grinding procedure and a selection of particle sizes (i. more than 0.15 mm, ii. 0.15 mm to 0.05 mm, and iii. less than 0.05 mm) were defined. To compare the yield, the mineral matter removal procedure was carried out with a basic leaching bath. Coal oxidation was performed using the modified Hummers process, and GO was then obtained using LPE. This method was feasible to produce GO from high-rank coal with acceptable quality and particulate size smaller than 0.15 mm, yields that are close to 5%, and flakes with fewer than 15 layers. This approach also could eliminate dependence on graphite as the carbon feedstock for graphene production.