Where compensation is payable for an occupational disease the only employer liable shall be the employer in whose employment the employee was last injuriously exposed to the hazards of employment resulting in such disease, provided that in the case of silicosis or asbestosis the only employer liable shall be the employer in whose employment the employee was last exposed to harmful quantities of silicon dioxide (SiO2) dust or asbestos dust during a period of sixty days or more.
NMS § 52-3-11