Gill, K.R.; Johnston, M.R. 1967 Nickel and copper sulphide mineralisation in the Riwaka Basin Complex, Graham Valley, north-west Nelson. Wellington: New Zealand Geological Survey. Report NZGS 26 19 p.
Abstract: In the Graham Valley, north-west Nelson, basic and ultrabasic rocks intruding Lower Paleozoic sediments, are reterred to the Riwaka Basic Complex. The complex consists of two major rock types; the most extensive being pyroxenite with minor gabbro. The other type is a peridotite outcropping as small discrete masses within the pyroxenite. Sulphides associated with the pyroxenite include pentlandite, pyrrohotite, and chalcopyrite; and chrome-spinel is associated with the peridotites. (auth)