The company started its international oil shale activities in 2006.

It has been involved in the development of oil shale since 2005.

This is considered the start of the modern oil shale industry.

The history of the oil shale industry started in ancient times.

The global oil shale industry has grown again from the mid-1990s.

The town was an important centre for the oil shale economy in the 19th and 20th Centuries.

The price of oil shale itself, however, has not risen.

However, as of 2011, there are no commercial oil shale operations in Israel.

Several companies in Australia have oil shale development plans and activities.

The Moroccan oil shale industry began with research during the 1930s.

In addition, it produced other chemical products from oil shale.

Of all the power plants fired by oil shale, the largest was in this country.

There are more than 30 known occurrences of oil shale.

The country is considering to apply nuclear power for its oil shale production.

The year 1916 is considered the beginning of the Estonian oil shale industry.

It was evident that Stone's oil shale plant did not work.

In other areas, water must be pumped out of oil shale mines.

The Canadians are going to develop their oil shale resources whether we buy it or not.

This mineral is embedded with oil shale in many areas.

History of the oil shale industry (from the mid-19th century)

A new strategy and legal framework for oil shale activities was adopted in 2005.

Against this backdrop, uncertainty continues on the future of oil shale.

Oil shale in Estonia is an important resource for the national economy.

Estonia accounts for about 70% of the world's oil shale production.

Some commentators have expressed concerns over the oil shale industry's use of water.

Oil shale, also known as kerogen shale, is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic chemical compounds) from which liquid hydrocarbons called shale oil (not to be confused with tight oil-crude oil occurring naturally in shales) can be produced.