Seawater⁃based gold extraction has attracted widespread attention due to its environmentally friendlycharacteristics. This method leverages the ability of the rich chloride ions in seawater to form stable complexes withgold ions, enabling selective leaching of gold. Given its unique geographical location and resource conditions, theShaling Gold Mine adopted seawater⁃based gold extraction, which significantly reduces dependence on freshwaterresources, lowers operational costs, and meets the specific demands of deep underground mining. Experimental resultsindicate that seawater⁃based gold extraction has minimal impact on the flotation metrics in the Shaling Gold Mine, witha gold recovery rate reaching 95.85 %. The cyanidation tests yielded favorable technical results: under the conditions ofgrinding fineness of −0.045 mm accounting for 95 %, CaO dosage of 6 000 g/t, alkaline pretreatment time of 3 h, NaCNdosage of 7 000 g/t, pulp concentration of 40 %, and leaching time of 48 h, good separation performance including aleach residue grade of 1.19 g/t and a gold leaching rate of 97.96 % was achieved. The application of seawater⁃basedgold extraction at the Shaling Gold Mine reflects the combined influence of resource conditions, technical feasibility,and environmental policies, representing a sustainable development trend in modern mining.