Abstract: Disclosed is a method of sealing salt mine headings. Salting out substances, adapted in quantity and quality for properties of effluent from the rift, are introduced into a rift in a rock mass, thus causing crystallization of salts identical or isostructural in relation to the salt forming the rock mass. The substances may be aqueous solutions of inorganic salts or they may be organic solvents. To avoid difficulty in mixing solutions, crevices are liquefied by introducing to their zone effluent and/or saline previously prepared and modified with salting out solutions. As inorganic salts, calcium chloride, magnesium chloride or mixtures thereof are used. As organic solvents, methanol or acetone is used.