Sub-categories in Top > Concentrators [Help] There are no sub-categories in this category. Items in this Category [Switch to list view] [Help] Item Notes Qty Contact 13" x 24" General Engineering Lab New Item 1 Joe Uzelac Jr. - (602) 942-7375/ (801) 972-5201 30" Knelson Concentrator 0 Joe Uzelac Jr. - (602) 942-7375 36" Hy-G Gold 20 HP 0 Joe Uzelac Jr. - (602) 942-7375 4 Humphreys Spiral 5 Turn 0 Joe Uzelac Jr. - (602) 942-7375 Goldfield Portable Trommel W/ Hopper 22" x 5'8" Length, 3.5 HP 0 Joe Uzelac Jr. - (602) 942-7375 Riechert Portable Spiral Concentrator Test Plant 0 Joe Uzelac Jr. - (602) 942-7375