2010/11/5 Richard Welty <[email protected]>: > 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 _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
