The coal reserves of the country were and still are extensive.
Colombia has some of the world's most significant coal reserves.
No.2 drift was closed on 19 May 1961 after working out all economic coal reserves.
The total coal reserves in Russia amount to 173 billion tons.
At current production levels, proven coal reserves are estimated to last 147 years.
In building a modern economy, for instance, China hopes to draw on its huge coal reserves.
The state has a large amount of coal reserves.
Sonora also has one of the largest coal reserves in the country.
It is extremely rich in natural resources, having one sixth of national coal reserves.
And in addition to all this Kosovo has 17 billion tons of coal reserves.
