Another World Postcard Day card! What a great card. Oskaloosa in a town of just under 11 000 people. in the lates 1800s and early 1900s is was a national centre of bituminous coal mining. Bituminous coal contains a tar-like substance called bitumen or asphalt. It is the most abundant rank of coal, often in rocks from the Carboniferous Age.
Bituminous coal is used primarily for electrical power generation and in the steel industry. It is suitable for smelting iron.
Bituminous coal is used primarily for electrical power generation and in the steel industry. It is suitable for smelting iron.
Bituminous coal also releases large amounts of firedamp, which is a dangerous mixture of gases that can cause underground explosions. Modern mining techniques includes attentive gas monitoring, good ventilation, and vigilant site management to prevent an explosion.

Comments
Post a Comment