Awkwardly for oil companies, bitumen is not ordinary oil.

They remove bitumen from the dirt in two ways.

Moreover, the newer bitumen technology does without strip mines.

Awkwardly for environmentalists, Nature put corrosive bitumen in the dirt.

Environmentalists make several arguments for leaving the bitumen in the dirt.

The companies want the bitumen that Nature put in the oily dirt.

This heats the bitumen, making it runny enough to be pumped out.

The companies want the bitumen that Nature put in the oily dirt.

Laying kilometer upon kilometer of bitumen is the favored solution for many politicians.

Then what you do is you heat up the steel, you melt the bitumen, and the bitumen will flow into these micro cracks, and the stones are again fixed to the surface.

US President Barack Obama has a limited opportunity to preserve the bitumen companies integrity.

The tar sands are hundreds of square kilometers of bitumen, a viscous and corrosive tarlike deposit.

Many bitumen companies claim that they already abide by such safeguards but environmentalists skepticism is justified.

Bitumen permeates the dirt at the surface or, where thin layers of compost and sediment intervene, somewhat below basement levels.

Trapped underneath the boreal forest and wetlands of northern Alberta are these vast reserves of this sticky, tar like bitumen.

Mandatory sequestration could make net CO2 emissions from bitumen extraction no worse than those from conventional oil wells, and perhaps even better.

An older technology features vast strip mines, huge diggers, and trucks carting oily dirt to industrial scale pressure cookers that drain off the bitumen.

As German states ceased to be a military crossroads, however, the roads improved the length of hard surfaced roads in Prussia increased from in 1816 to in 1852, helped in part by the invention of macadam.

67. There are 110 kilometres of roads in the Territory outside Stanley, of which approximately 20 per cent are surfaced in bitumen, asphalt or concrete.

66. The total length of roads outside Stanley amounts to 175 kilometres of which approximately 20 per cent are surfaced in bitumen, asphalt or concrete.

Had BP spilled hundreds of billions of barrels of bitumen across hundreds of square kilometers, environmentalists would rightly demand that no expense be spared to rid the dirt of every trace of oil.

So what we can do is use steel wool just to clean pans, and the steel wool we can cut in very small pieces, and these very small pieces we can mix to the bitumen.

Due to weathering, due to U.V. light, due to oxidation, this binder, this bitumen, the glue between the aggregates is going to shrink, and if it shrinks, it gets micro cracks, and it delaminates from the aggregates.

Besides the largest conventional oil reserves and the second largest natural gas reserves in the Western Hemisphere, Venezuela has non conventional oil deposits (extra heavy crude oil, bitumen and tar sands) approximately equal to the world's reserves of conventional oil.