whether Individual, association, or corporation shall be hable for the death or injury, caused by any accident due to a condition or. conditions of such occupation, of any employee in the service of such employer in such hazardous occupation, in all cases in which such death or injury of such employee shall not have been caused by the negligence of the employee killed or injured.
“Section 8. The .Legislature shall enact a Workmen’s Compulsory Compensation. law applicable to workmen engaged in manual or mechanical labor in such employments as the Legislature may determine to be especially dangerous, by which compulsory, compensation shall be required to be paid to any such workman by his employer, if in the course of such employment personal injury to any such workman from any accident arising out of, and in the course of, such employment is caused in whole, or in part, or is contributed'to, by a necessary, risk or danger of such employment, or a necessary risk or danger inherent in the nature thereof, or by failure of such employer, or any of his or its officers, agents, or employee, or, employees, to exercise due care, or to comply .with any [law] affecting such employment; Provided, that it shall be optional with said employee to settle for such compensation, or retain the right to sue said employer as provided by the Constitution.”
Obeying the constitutional mandate, the legislature enacted the “Employers’ Liability Law,”, approved Máy 24, 1912, (c. 89, Laws of Ariz., 1912, p. 491;.-Rev. Stats. Ariz., l9l3, pars. 3153-3162) which provides:
That to protect the safety of workmen at manual or mechanical labor in many occupations declared hazardous and enumerated in § 4 — among them all work in or about mines and in mills, shops, plants and factories where. steam or electricity is used to operate machinery — every employer; whether individual, association or corporation “shall be liable for the death or injury, baused by any