The region is underlain by an assemblage of sedimentary rocks consisting mainly of continental margin and shelf facies rocks. This assemblage was deposited on and to the west of the ancestral North American craton. These sedimentary rocks, for the most part typical miogeoclinal facies, range in age from Hadrynian to Upper Cretaceous. Structurally these rocks are part of the Foreland Thrust and Fold Belt of the North American Cordillera.
Phosphatic units occur mainly within the Whistler Member of the Triassic Sulphur Mountain Formation, Spray River Group. The Whistler Member is dominated by cycles of algal laminated silty limestones grading into massive calcareous siltstone. Silty shales, pelletal phosphorite and phosphatic pebble conglomerates form important but minor interbeds. The basal three metres of the Whistler Member contains a concentration of pelletal phosphatic material culminating in a phosphatic conglomerate. The basic structural style in the area consists of northwest to southeast trending tight anticlines with relatively broad box-like synclines. Minor structures are responsible for both removal and repetition of the phosphatic section and there- fore influence the distribution of the phosphatic units. The average of 16 hand trenches and surface sections in 1988 was 16.66 per cent phosphate over 1.41 metres (Assessment Report 8407).
In 1998, the area was staked as the Farm claims.