Which professional is likely to have the most supervisory authority on mine sites?

The superintendent holds the highest level of supervisory authority on mine sites among the options provided. This position encompasses overall responsibility for the operation of the mine, including safety, production, and personnel management. Superintendents typically oversee multiple departments or functions within the mining operation, effectively coordinating resources, ensuring compliance with regulations, and implementing strategic goals for efficiency and productivity.

While a mine foreman is a critical role focused on day-to-day operations and supervises the work of miners, their authority does not typically extend to the broader operational responsibilities that a superintendent manages. The assistant mine foreman also supports operations but remains primarily under the direction of the mine foreman. Surface construction workers focus on specific tasks within construction and do not possess supervisory authority in the broader operational context of mining.

Thus, the superintendent is the key figure with comprehensive supervisory power, qualified to make high-level decisions and lead the overall operation of the mine effectively.