Halemba represents one of the largest coal reserves in Poland, having estimated reserves of 120 million tonnes of coal.

As a result of these studies have estimated reserves of copper-molybdenum ores in the amount of 612 million tons on C2 category.

The American Gas Association, a trade group in Washington, estimates probable reserves of coalbed methane at 90 trillion cubic feet.

The trade group estimates total probable reserves of all forms of natural gas in the United States at 796 trillion cubic feet.

Botswana has significant reserves of coal, estimated at over 200 billion tons.

Dobropilska represents one of the largest coal reserves in Ukraine, having estimated reserves of 58.6 million tonnes of coal.

Insurance companies have always had latitude to estimate required reserves, and top management seems to have used it with a bit more abandon than was proper.

Exact figures are debatable, because methods of estimating reserves vary and it is often difficult to forecast future discoveries.

Bloomberg estimated remaining reserves of 55 billion barrels as of 2005.

In 2013, the Russian oil company Rosneft estimated recoverable reserves of 22 billion barrels for the formation.