CMG Cleantech S.A., a mining company, engages in the extraction of granite in Uruguay. It provides gray granite for various applications, such as tombstones, paving and facades, furniture, and public roads; and violet blue granite. CMG Cleantech S.A. was formerly known as Compagnie Mercosur Grecemar S.A. The company was incorporated in 2015 and is based in Paris, France.