Its quite obvious: if you specialize in a certain field or profession, you learn things others do not know and so you need a terminology to describe them. For some reasons some professions tend to rename even common stuff, just to create a sort of secret language. You probably know some marine terminology like backboard for left and starboard for right. Miners have their own secret language. An elevator is a cage, an adit is a tunnel used to drain the mine. Our website is intended for tourists, so we use such terms but always explain them. However, if you are interested in more of those terms, or try to understand a mining related text we linked, here are numerous quite helpful glossaries for "Minerish".