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An adit.

In North America, the horizontal or sloped entrance to a mine is called a "Portal".

Portal more specifically refers to the portion of the shaft visible from the outside of the mine.

In some areas, the Portal portion of a horizontal shaft is called the "Drift Mouth" or "Drift Portal" as this shaft leads into a "Drift Mine".

With a vertical shaft, that portion would be called a "Collar".

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9y ago
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11y ago

For an ordinary strato volcano (cone-shaped) the throatwould be the name.

But for some shield volcanoes, the caldera may be the name of the magma pool whilst it is close to the surface.

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14y ago

Its called a shaft, whether it is a horizontal or vertical opening. An adit.

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Q: What is the entrance or opening to a mine called?
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