On Sat, Dec 6, 2014 at 1:43 PM, Friedrich Volkmann <b...@volki.at> wrote:
> > > Wikipedia says: "An adit (from Latin aditus, entrance)[1] is an entrance to > an underground mine..." > > An adit_entrance would be an entrance to an entrance. > > An adit is the entrance to a mine in the way a lobby is an entrance to a building; you could still have a lobby entrance without committing a solecism. In the parlance I'm familiar with (generally hard-rock mining in the northeastern US), an "adit" is a more or less horizontal tunnel that's driven from the outside of the mine to bring miners to the vein of the desired mineral, and often to provide drainage. That is, the material excavated to create the adit is generally country rock rather than the ore being sought; a horizontal tunnel following the ore is a "drift". The problem with all this is that identifying adits, drifts, stopes, etc. may require knowledge about the working of the mine and the ore body which has long since been lost. While I was composing this, Mateusz hit what I think is the key point for mapping: for a given entrance, the main thing we'd like to know is whether it's an entrance to a roughly horizontal tunnel, a roughly vertical shaft, or some intergrade between the two. (e.g., past a certain gradient, the entrance should probably be marked as a shaft rather than a vertical entrance). There's nothing wrong with tagging the adit itself, but that should be applied to the underground passage rather than the portal to the passage. -- Chris Hoess
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