Open pit view of a quartzite rock quarry in Sioux Falls, South Dakota Stock Photo - Alamy(00)

Open pit view of a quartzite rock quarry in Sioux Falls, South Dakota Stock Photo - Alamy(00)

Image gallery: The Quarry Porn

Open pit view of a quartzite rock quarry in Sioux Falls, South Dakota Stock Photo - Alamy United Kingdom Quarries and Plants - Polycor Inc.