Sida laga soo xigtay warar la sii daayay Noofambar 8, 2021, sahanka juqraafi ahaan ee Mareykanka (USGS) ayaa dib u eegay noocyada macdanta iyadoo loo eegayo macdanta tamarta ee 2020, kuwaas oo ah 50-tayada ugu dhawaanshaha ah ee la daabacay, oo ah qaab alifbeere ah).
Aluminium, antium, arsenic, beberlium, cuur-dilthium, guntium, lattium, furaha, magnesium, magnesium, manenese, neastrium, neastrium, neodenenium, neastrium, neastrium, neastrium, neodenenium, neastrium, neastrium, neodenenium, neodenenium, neodarnia. Nickel, Niobium, Paltadium, Platinum, Praseymium, Runium, Thebium, Thebium, Thebium, Thebium, Ytterrium, ytrium, ytrium, zinc, zulium, zulium, zulium.
Sharciga tamarta, macdanta muhiimka ah waxaa lagu qeexaa inay tahay macdanta aan danini ahayn ama waxyaabaha macdanta ah ee muhiimka u ah dhaqaalaha Mareykanka ama amniga Mareykanka. Waxaa loo arkaayay silsilad sahay oo jilicsan, Waaxda Arimaha Gudaha waa in ay cusboonaysiisaa xaalada ugu yaraan saddexdii sano ee saldhigga ah ee ku saabsan habka cusub ee Sharciga Tamarta. USGS waxay codsanaysaa faallooyinka dadweynaha inta lagu gudajiro Noofambar 9-dii Diseembar 9-keeda, 2021.