Mining

2. Sometimes big vehicles. Long hair should be tied up to not get stuck in it
4. The production of salt by pumping water into subterranean salt deposits
7. The action of exploring an unfamiliar area. Indiana Jones did it when exploring the 'Temple of the Forbidden Eye'
10. Used to be used for functioning trains
12. Rock or soil overlying a mineral deposit, archaeological site, or other underground feature
14. A building equipped with machinery for grinding things. The one with the beginning word 'wind' makes bread
16. A precious or semi-precious stone, especially when cut and polished or engraved. An outstanding person can be considered one
17. Taking out/removing, especially using effort or force
18. Used for rowing. A naturally occurring solid material from which a metal or valuable mineral can be extracted profitably
19. The title of this crossword. It is the process or industry of obtaining coal or other minerals from a mine

1. It is a job where people are an expert geology
3. Popular in jewellery and usually considered treasure in movies
5. A silvery-white metal, the chemical element of atomic number 28. Featured in some versions of Eeny, meeny, miny, moe
6. The outside part or uppermost layer of something. There is a song in the Disney movie 'Encanto' which is about this word and its pressure
7. Enthusiasts of this subject are trying to protect it. It is what's surrounding us
8. A series of actions/steps in order to do something. Word is mentioned in other clues
9. A type of mining. It means to cut excessively
11. A surface mining technique that extracts minerals from the ground
13. Beneath the surface of the ground. It is also a type of mining
15. The process of wearing or being worn by long exposure to the atmosphere. First part of the word is regularly in the news