A 16-kilometre long northwestward trending mass of thickly bedded coarse grained grey limestone up to 900 metres wide outcrops between Marmor Peak and the headwaters of the Mussel River, 110 kilometres south-southeast of Kitimat. The deposit is enclosed in hornblende and epidote rich gneissic skarn flanked by garnet bearing schists, gneisses and hornblende plagioclase amphibolites. The limestone is intercalated with quartz zones commonly containing chlorite, epidote and muscovite. An extensive stockwork of pegmatite cuts the limestone.