Quarrying means exploitation of big rectangular blocks of rocks like marble , sandstone. And there benches are almost 90 degree because of very hard competent rock and good slope stability. read more
In the UK a 'mine' is defined legally as an underground working and a 'quarry' as a site of mineral extraction without a roof. In other parts of the world, the world, ‘mining’ is used interchangeably with ‘quarrying’. read more