13 Skarn zonation in the Big Gossan Cu-Au skarn system (Meinert et al., 1997). (a) Schematic cross section based on known skarn mineralogy (top and right) above a hypothetical intrusion at depth. Lithologies: Kkel = Kembelangan sandstone, Kkeh = Kembelangan hornfels, Waripi Formation limestone. (b) Skarn (in drill core) from proximal 1) red-brown garnet-chalcopyrite, 2) brown garnet-green pyroxene-chalcopyrite, 3) green pyroxene-pyrite-chalcopyrite, and 4) distal dark green Fe-rich pyroxene and 5) fluid escape structures in limestone beyond the skarn front.