Assertion: pit pony | /r/HasProperty | commemorated by 660 ftartwork
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text: Pit ponies are commemorated by a 200 metres (660 ft) artwork, Sultan, created between 1996 and 1999 by Mike Petts, using 60,000 tons of coal shale waste, covered with living grass, in a country park on the site of the former Penallta Colliery, north of Caerphilly, Wales.