on 05/11/2010 Martin Koppenhoefer wrote > 2010/11/5 Richard Welty <rwelty at="" averillpark.net="">: >> On 11/5/10 11:05 AM, Richard Mann wrote: >>> >>> Gravel/sand/clay come from river beds, generally. Quarries are when >>> you blast half a hill away. >>> >>> But I'm not an engineer... >> >> gravel around here comes from excavating in the sides of hills >> that are actually piles of debris left by glaciers in a previous ice >> age. >> >> in the southeast US, clay comes from pretty much anywhere you >> use a shovel. > >thanks for all your comments so far. > >could a clay pit that is used only to excavate clay be put under >quarry, or would that be missleading? I know that these are all >open-cast mines, but the wikipedia entry for quarry seems somehow not >precise enough when it comes to delimiting the usage. > >cheers, >Martin
I am an engineer :-) (though not in the mining industry) My Penguin Dictionary of Civil Engineering has "quarry: An open pit from which building stone, sand, gravel, mineral, or fill is taken" This looks a wide enough definition to include clay. Richard _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
