Járn er annað algengasta frumefnið á jörðinni og samanstendur næstum af 5% af jarðskorpunni. Iron ores are rocks and minerals that contain metallic iron that’s extracted by

Most rocks contain some form of metals or minerals. Not all of them have a concentration significant enough to justify mining. Those that do contain commercially valuable materials are the

“If it can’t be grown it must be mined” is a common adage in the mining industry, and that’s not much of an exaggeration. It’s hard to think of any