Bulk Testing Procedure – Description of Pilot Plant88 Кб. Material was fed into a 6m3 hopper protected by a 150mm grizzlyof the results of the bulk testing of tailings from the Toson Mine on the Toson Terrace is presented in the following chart: TAILINGS Toson Mine on Toson Terrace Gravel/sand & minimal silt Variable thickness Total Gold Recovered Loose.