Congenital anomalies are also known as birth defects, congenital disorders or congenital malformations. Congenital anomalies can be defined as structural or functional anomalies (e.g. metabolic disorders) that occur during intrauterine life and can be identified prenatally, at birth or later in life.
But unlike in 2012 when Wyoming was home to nine of the US' ten biggest coal mines, the Cowboy State had a bit more competition last year. North Dakota's Freedom mine has taken the spot of the US' tenth biggest coal producer, as Wyoming's Caballo slid off the top-ten chart. All production figures are in metric tonnes.
Coal mining employed 4,000 workers at 30 locations in 2013, extracting 13 million tonnes of coal. The three deep-pit mines were Hatfield and Kellingley Collieries in Yorkshire and Thoresby in Nottinghamshire. There were 26 opencast sites in 2014, mainly in Scotland.