Gusaba: Flat ring high gradient magnetic itandukanya ikoreshwa cyane muri hematite itose, limonite, siderite, chromite, ilmenite, wolframite, tantalum na niobium ubutare hamwe nandi mabuye y'agaciro ya magnetiki adakomeye, hamwe namabuye y'agaciro atari metallic, nka quartz, feldspar mugukuraho ibyuma byanduye no kwezwa. .