Somerset is a predominantly agricultural county with arable cropping and dairy farming; Cheddar cheese is a well-known product. The main field crops include wheat, barley, oats and root crops, and extensive orchards produce cider apples. Large numbers of cattle and sheep are kept, and Exmoor ponies and red deer roam on the open moorland in the west of the county. Coal was at one time mined in the county; the Somerset Coalfield stretched from Cromhall to the Mendips, and from Nailsea to Bath. The last two pits, at Kilmersdon and Writhlington, closed in 1973. Minerals mined here at one time included iron, lead, zinc, slate and fuller's earth.