The Rapid Creek Formation, exposed at Big Fish River and Rapid Creek, in the Richardson Mountains of Yukon is well known for its rare phosphate minerals. Mapping, geochemical sampling, and collection of phosphate minerals and nodules from this formation occurred over a three week field program in the summer of 2012. The Rapid Creek Formation is a phosphorite-rich ironstone facies composed of alternating beds of phosphate and siderite-rich mudstones and shale. Secondary minerals collected from crosscutting mineralized veins in this area include unusual apatite, augelite, arrojadite group minerals, dypingite, lazulite, and garyansellite-kryzhanovskite. Phosphate nodules with satterlyite, wolfeite, vivianite-baricite, wicksite, and arrojadite-group minerals have been identified and collected for study.
