 There are three ultramafic horizons recognised within the LJGB stratigraphy; the Eastern, Central, and Western ultramafic.The entirety of the belt's nickel endowment is hosted within the Central Ultramafic Unit, known as the "CUU".However, disseminated and low tenor nickel mineralisation is known from the other ultramafic units, especially the Western Ultramafic Unit ("WUU").