Abstract: An apparatus for automatically preparing a multi-ingredient mixture in batches in a mixing tank and providing a continuous supply of the mixture to a run tank in response to down stream demand. Gravimetric means provide monitoring signals indicative of the actual weight of the contents of each tank. Deviations from target ingredient ratios are automatically registered and compensated for in preparing each batch by logic control means which compare the actual weight of each ingredient added with a precalculated target weight, calculate target weights for the second and subsequently added ingredients on the basis of the actual amounts of ingredients added earlier and automatically activate the mixing tank outlet valve and the ingredient supply valves.