How?

Terminology (how we refer to things) is important. THEN uses the following terms.

Term	What it means
adit	horizontal, or mostly horizontal, passage in a mine that opens to the outside
drift	horizontal, or mostly horizontal, passage in mine; may open into a shaft
drifting	creating a drift
main	main line of a railway
portal	the mouth of an adit, i.e., that area surrounding the location where an adit opens to the outside
shaft	vertical, or mostly vertical, passage in a mine
sinking	excavating a shaft
spur	section of railway track connected to the main at one end; unlike a siding, which is connected to the main at both ends
tailings	material left over after mined material has passed through a mill; usually stored in tailing piles or ponds
waste rock	rock from a mine that is cast aside before milling because it contains little or no useful ore. In many early Yukon copper mines that were dug by hand, bits of rock were sorted manually. Waste rock was piled adjacent to the mine entrance. In later mines, which were excavated by machinery, much larger quantities of waste rock were trucked some distance from the mine and spread around in big flat piles by bulldozers.
wye	fixed Y-shaped configuration of tracks that allows a locomotive or railway cars to be turned around or to permit access to a spur by a train travelling in either direction on the main

TimmiT History Exploration Notebook