Most hiring managers have been there: you have a highly qualified candidate that you've been actively pursuing for an open position. They've been in for an interview or two and passed several levels of screening. Then, when the time comes to fill that open position, you offer them the job--only to discover that their interest has disappeared.
It can be discouraging looking for a new job in the mining industry as an older worker. Throughout the mining industry, many companies are seeking to hire younger employees in the hopes they can groom them into employees who will stay with the company for 20 years or more.