The dynamics of the job market in the mining industry depend entirely on the state of the industry. In boom times, jobs are aplenty and there is work for all. The opposite holds true as well. Currently, the mining industry is in the downturn of a typical cycle, but this does not mean you should stop looking to promote yourself and your skills.
Even if you are not actively looking for a new job, having your resume active on a site like Careermine, means that you would be discoverable by companies looking for your skill set, or they would save your information for a later date, should a suitable position arise. Set up Job Alerts to keep yourself in the loop on what jobs are out there, who knows what opportunity might pop into your inbox.