The terms "hypogene" and "supergene" refer to the depth at which they occur. Minerals formed in this way are called primary, or hypogene, minerals. "Pyrite is present everywhere" and chalcocite and covellite appear as both supergene and hypogene minerals. It has also been found in hypogene ores of Kazakhstan, Xinjiang and Tuva. The porphyry copper deposit and hypogene mineralization occurred in the Early Eocene. Below the water table, hypogene ores include uraninite (pitchblende), Co-Ni sulfides and selenides.