alt Hacker NewsTIL there's a mine within San Francisco city limits! https://mines.fyi/mine/0405261
(I guess technically a "surface mine" for "Construction Sand and Gravel".)
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dboreham • today at 12:43 AM
The data set includes gravel pits. You can filter them out by selecting "Underground" for "Type".
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Once you learn how to spot these you'll see them everywhere on road trips and such.