Assuming Almería province is 8,774km2, that’s 877,400 ha2 meaning…
That’s 10% of the province out to tender? Crikey.
Of course, the concessions just let you go out there with a JCB and dig about until you hit whatever you have to the right to look for. Yeso, marble, ornamental rocks (gravel I suppose, not just the fishtank ones) and barites mainly. You then have to go back and purchase the land, etc.
You can see the whole list and if the concession is near your home in the countryside here. Scroll down the first few pages of bumf to get to the good stuff.