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In the context of exploiting extensive recoverable coal reserves situated beneath buildings, water bodies, and railways, the application of paste backfill mining has gained prominence. This study addresses the unique requirements of mines characterized by substantial mining heights and the need for long-distance slurry transportation. It focuses on optimizing the composition of paste backfill materials suitable for such demanding conditions. Investigations indicate that increasing the slurry concentration to 79% optimally balances various factors: it reduces the slump degree and bleeding rate while enhancing the material's strength and reducing the setting time. Similarly, an optimal 7% incorporation of cementitious materials into the backfill composition is identified. This proportion not only augments the backfill body's strength and the slurry's slump degree but also minimizes the bleeding rate and shortens both the initial and final setting times. Such a composition ensures efficient transportation performance, effective control over the overlying rock strata and surface movement, and facilitates the extensive disposal of mine-related solid waste. This study underscores the criticality of precise backfill material formulation in ensuring structural stability and environmental sustainability in mining operations. [ABSTRACT FROM AUTHOR]