 Kucherwa kwegoridhe kubva kune alluvium ores kwaimbove kwakaitwa nemaitiro anoenderana nekuchera kweplacer senge nyore goridhe panning uye sluicing, zvichikonzera kudzoreredzwa kwakananga kwegoridhe diki uye maflakes. Nzira dzokuchera dzokuchera dzokuchera. Kuchera mvura kwakashandiswa zvikuru mukuchera ndarama kweCalifornia, uye yaibatanidza kuputsika kwemadhamu emvura nemhepo dzakakwirira dzemvura. Zvicherwa zvematombo akaoma zvakaumba hwaro hwehuwandu hwezviitiko zvekutengeserana zvegoridhe kubva pakati pezana ramakore rechi20 apo gomba rakavhurika uye kana sub-surface yekuchera matekinoroji anoshandiswa. 