This result made Hill 50 Australia's most profitable mine between 1955 and 1961.

It is also the world's most profitable mine.

Coal was nationalised in 1946, and the companies regrouped modernized the more profitable mines.

He also acquired profitable mines, the Belmont amusement park in Montreal and the Royals, the city's minor-league baseball team.

"This is one of the company's most profitable mines," David told Kate.

It was KGHM International's most profitable mine, pulling in a net revenue of $532.9 million in 2012.

You can have profitable mines if you want more fatalities, more accidents and more bad news like Bilsthorpe.

It was established by the Ryan family, the later developers of the Lost Horse Mine, which became the most profitable mine in the area.

The UVX became a profitable mine.

Those two mines were eventually the most profitable mines in Tombstone.