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.
Health risks associated with Coal mining. 1  There are a great many risks to your health which can be linked to coal mining operations. Though there are obvious workplace hazards associated with working in a coal mine, these are not the only risks associated with mining activities. 2  Occupational Hazards of Miners.