about 100k people. used to be double that.
Flints-noun1.a hard stone, a form of silica resembling chalcedony but more opaque, less pure, and less lustrous.2.a piece of this, especially as used for striking fire.3.a chunk of this used as a...
they already have been there
Flint-silica: 1390 kg/cu.m
Flint is used to produce sparks to ignite powder.