On the Arctic Coastal Plain of northern Alaska, we investigated an unusual ice-cored mound rising 3 meters above surrounding ice wedge polygonal tundra. Unlike typical pingos in this region, this feature lacks an associated drained lake basin and contains saline ground ice and brine, suggesting a different origin and formation history. Drilling revealed a sequence of solid ice, slushy ice, hypersaline unfrozen brine (cryopeg), and ice-rich silty clay. Geochemical analyses showed strikingly high salinities for ground ice and stable water isotope values that deviate from typical meteoric signatures. The isotopic trends and d-excess values indicate strong non-equilibrium freezing processes, such as rapid ice formation and cryogenic distillation. Carbon isotope signatures of dissolved inorganic carbon further suggest sub-zero microbial activity, possibly linked to methanogenesis. These findings provide the first evidence of a saline, gas-charged ice-cored mound in Arctic Alaska, with characteristics resembling the precursors to explosive gas emission craters recently observed in Siberia. Ongoing geophysical surveys and lab analyses—including measurements of ice-entrapped gases, ions, heavy metals, and microbial communities—will help clarify the mound’s formation mechanisms and gas sources, and improve understanding of the geologic and climatic processes shaping saline permafrost landscapes in a warming Arctic.