Sida laga soo xigtay war-saxaafadeed taariikhdiisu ahayd Noofambar 8, 2021, Sahaminta Juqraafiga ee Mareykanka (USGS) ayaa dib u eegis ku samaysay noocyada macdanta sida waafaqsan Xeerka Tamarta ee 2020, kuwaas oo loo aqoonsaday macdan muhiim ah sannadkii 2018. Liiska cusub ee la daabacay, 50 nooc oo macdan ah ayaa la soo jeediyay (sida xarfaha loo kala horraysiiyo).
Aluminium, antimony, arsenic, barite, beryllium, bismuth, cerium, cesium, chromium, cobalt, chromium, erbium, europium, fluorite, gadolinium, gallium, germanium, graphite, hafnium, holmium, indium, iridium, lanthanum, nickium, magnesium, neckium, lithium. niobium, palladium, platinum, praseodymium, rhodium, rubidium, lutetium, samarium, scandium, tantalum, tellurium, terbium, thulium, tiin, titanium, tungsten, vanadium, ytterbium, yttrium, zinc, thulium.
Xeerka Tamarta, macdanta muhiimka ah waxaa lagu qeexaa macdan aan shidaal ahayn ama walxo macdan ah oo lagama maarmaan u ah dhaqaalaha Mareykanka ama amniga. Waxaa loo arkaa silsilad sahay oo jilicsan, Waaxda Arrimaha Gudaha waa inay cusboonaysiisaa xaaladda ugu yaraan saddexdii sanaba mar iyadoo ku saleynaysa habka cusub ee Xeerka Tamarta. USGS waxay codsanaysaa faallooyin dadweyne inta u dhaxaysa Noofambar 9-Diseembar 9, 2021.