Sida lagu sheegay war-saxaafadeed ku taariikhaysan Noofambar 8, 2021, Sahanka Jiyoolajiga ee Maraykanka (USGS) ayaa dib u eegay noocyada macdanta sida waafaqsan Xeerka Tamarta ee 2020, kuwaas oo loo qoondeeyey inay yihiin macdan muhiim ah 2018. Liiska cusub ee la daabacay, 50 soo socda noocyada macdanta ayaa la soo jeediyay (sida alifbeetada u kala horreeyaan).
Aluminium, antimony, arsenic, barite, beryllium, bismuth, cerium, cesium, chromium, cobalt, chromium, erbium, europium, fluorite, gadolinium, gallium, germanium, graphite, hafnium, holmium, indium, iridium, lanthanum, lithium, magnesium, manganese, neodymium, nikkel, 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 inay yihiin macdan aan shidaal ahayn ama walxo macdan ah oo muhiim u ah dhaqaalaha ama amniga Maraykanka. Waxaa loo arkaa silsilad sahayda jilicsan, Wasaaradda Arrimaha Gudaha waa in ay cusboonaysiisaa xaaladda ugu yaraan saddexdii sanaba mar iyada oo ku saleysan habka cusub ee Sharciga Tamarta. USGS waxay codsanaysaa faallooyin dadweyne inta lagu jiro Noofambar 9-keeda Disembar 9-keeda, 2021.