oil shales

Also 19 deposits of oil shales have been identified in Canada.

Instead domestic oil shales were heated to produce the needed petrol.

His main focus was an investigation of plant remains in coals and oil shales.

Some oil shales can also be used for uranium and other rare chemical element production.

Although oil shales are found in many countries, the United States has the world's largest deposits.

The Greens have made a proposal to remove oil shales from the definition of coal completely.

It was suitable for processing of wide variety of oil shales.

A tarry stuff you find in oil shales.

These macerals are usually found in relatively small amounts in most oil shales.

It has tested its technology for extraction on Colorado and Kentucky oil shales.

The cuesta region contains coal, black shale and some oil shales.

Siliceous oil shales are usually dark brown or black shales.

Though similar in their formation process, oil shales differ from coals in several distinct ways.

Reactive fluid technologies are suitable for processing oil shales with a low hydrogen content.

Marble quarries, semiprecious stones, and oil shales were all exploited.

They want what I want, which is proper, fair labelling of tar sands and oil shales.

As a source for hydrocarbon production, particular interest is oil shales in Dead Sea graben area.

The model includes non-conventional oil resources such as oil shales and tar sands.

Some oil shales contain uranium as a byproduct.

For instance, with tar sands and oil shales, surface mining is the most economical method of recovery.

They contain strata of hydrocarbons (oil shales), which have been burning continuously for centuries.

Israeli oil shales belong to the group of Upper Cretaceous marinites.

Known oil shales are predominantly aquatic (marine, lacustrine) origin.

Oil shales are found near Vranje and Aleksinac.

The process is suitable for processing of mineral-rich oil shales, such as in the Piceance Basin.