A feeding apparatus consisting of a supply hopper (100) and a weighing hopper (150). Feeding of material from the supply hopper (100) to the weighing hopper (150) varies between a bulk feed rate and a fine feed rate by varying the size of the opening of the supply hopper aperture by independently controlling the two closing flaps (410,420). There may be more than two flaps, and the flaps may vary in size relative to one another.