Abstract: Background: Kaolin fireclay is a waste product of brick production. The estimated 150,000 t of fireclay produced annually represents nearly 30% of the total amount of bricks produced by weight. This study explored the reuse of fireclay in brick production at the Ain Nouissy Mostaganem brick factory in Algeria. The need to recycle the fireclay is an environmental as well as a financial concern because of the exhaustion of clayey natural resources and constraints related to its storage and future use. The physico-chemical and mechanical characteristics of bricks made from the reuse of fireclay can be affected by the particle size distribution and percentage added of this latter. Materials and Methods: In this study, several different amounts of fireclay that had different particle sizes were included in the brick manufacturing process. The effect of the fireclay on the quality of the resulting bricks was assessed in terms of liquidity limits, plasticity, bulk density and mechanical compressive strength and bending. Results: We found that fireclay particle size and amount for optimal brick production was 0.2 mm average diameter and 4% dry weight of the raw material, respectively. In this case the brick records an increase resilience of 20%. Conclusion: This study suggested that reinjection of fireclay in manufacturing process, not only improves the resilience quality of brick but also, contributes to reduce the financial and spatial constraints of handling and storage of fireclay.