There is nevertheless an obstacle involved. Let's take the example of someone who has undergone professional training and wants to go through technical training at a college. If that person was employed by a mining company, they would have access to the company's grants and special programs used for fostering its employees' professional development. However, as they are employed by a subcontractor, they don't have access to that.
People often work for some 10 years for one subcontractor or another before they finally get hired by the mining company itself. After 10 years, they no longer want to go back to school for training. Who would want to spend three years in college, running around and studying like crazy, with children waiting at home? People—