The Biomes O Plenty alps, showing the transition from limestone, to sandstone, to gneiss peaks.Typical continental sedimentary strata: limestone, claystone, mudstone, conglomerate.Large beds of coal, suitable for pit mining.Chalcopyrite (and gold) veins, one of the types of vein deposits.Layered evaporite deposits, consisting of salt ores like rock salt and gypsum.Clay limonite (iron ore) deposits in tropical biomes and swamps.Placer deposits of mineral-rich sands on river banks and beaches.Banded iron ore being extracted from a hillside.A layered igneous intrusion, diorite into gabbro, with molybdenite veins.An ore-rich pegmatite vein intersecting a mineshaft.