Assessment of copper slag (CS) as fine aggregates on the sulfate resistance of self compacting concrete (SCC) was examined. Three series were prepared and each series contains six mixes. Series 1, series 2 and series 3 were designated as CS mixes, CS mixes blended with silica fume and CS mixes blended with metakaolin respectively. Each series were tested for compressive strength, microstructural analysis and sulfate attack. Mass variation and loss in compressive strength after sulfate exposure were the parameters to assess the sulfate attack. The results reveal that maximum compressive strength exhibited for CS mixes blended with metakaolin followed by CS mixes blended with silica fume. The dense microstructure was observed for series 3 and 2. Among three series, highest change in mass was noticed for CS mixes and lowest for CS mixes blended with metakaolin. Beside rise in the percentage of CS substitution, endurance against sulfate attack enhanced in terms of loss in compressive strength except 100% CS substitution for series 3 and 2 whereas for series 1, resistance to sulfate attack declined beyond 40% CS substitution with reference to control concrete. This study encourages to utilize CS as an alternative to fine aggregates with mineral admixtures for better resistance against concrete structures susceptible to sulfate attack.