Moles, brown spots and growths on the skin are usually harmless â but not always. Anyone who has more than 100 moles is at greater risk for melanoma. The first signs can appear in one or more atypical moles. That's why it's so important to get to know your skin very well and to recognize any changes in the moles on your body.
The North Antelope Rochelle coal mine in the Powder River Basin of Wyoming, US, is currently the world's largest coal mine by reserve. The mine was estimated to contain more than 2.3 billion tonnes of recoverable coal as of December 2012. The mine is owned and operated by Peabody Energy.
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.