Sometimes minerals thought of as gangue are later recovered and used.

The ore floats while the gangue sinks to the bottom.

The worthless gangue was then disposed of, often by draining.

In the 21st century, the use of gangue has been considered from an environmental point of view.

Gangue is the miners' term for rock in which valuable ores are embedded.

The non-magnetic gangue descends in a straight line to the other side of the partition.

Roecoelite is considered a gangue mineral of no value when found with gold.

Secondly, the mineral is separated from the gangue.

Gangue is the worthless substance that is left behind when minerals are processed.

The sulfide minerals float, while the gangue sinks to the bottom and is removed.

For example, in 2002, about 130 million tons of gangue were produced per year from coal mining in China.

The ore is washed (and gangue removed) and sorted by size.

The fundamental principle was that heavy particles of ore remained on the table and the gangue would be washed away by water.

Quartz occurs in hydrothermal veins as gangue along with ore minerals.

Their gills are black with gangue.

Lankwiler, you will immediately begin to chip gangue.

It is used to separate sulfide ores from the gangue, the impurities in the ore.

Mineral processing often relies on the formation of froth to separate rich minerals from gangue.

A residue containing gangue, barium, radium, and lead sulfates will be left over.

The lighter gangue material such as sand, mud and gravel are then washed over the side of the pan, leaving the gold behind.

Often, the nature of the gangue is important, as clay-rich native copper ores prove difficult to liberate.

This makes the "marked" gangue particles float off with the graphite, yielding impure concentrate.

Natural iron minerals are mixtures of iron and unwanted impurities, or gangue.

In some operations, components of the gangue may also be toxic, though it is rare for these materials to be present above trace levels.

Work on removing gangue started at Bjørnefjell the following year, and mining of the ore there was completed within two years.

The next night, his gang made good on its word.

Most of the time, they were started by gang members.

She has left the gang and found new friends at school.

Little was known about the lives of the gang members.

White gang members take up most of his time these days.

The body of a girl was found in the gang car.

Set light to a car with a gang of others.

He had to put himself in the position of the gang.

They had been given three months on the work gang instead of a few weeks.

But quite often the gang of us would do something together.

The people who took the young men were the the press gang.

A gang is a group of people who do things together.

I had to deal with a gang almost every day.

Here comes the little gang I asked to help us.

One of the gang tried to back away, but the others held him in place.

I heard some members of another gang talking about them.

Even at the time the gang of four was not a united team.

Not to be in the gang, but for other things.

She tried her best to be one of the gang.

I had a whole gang of friends in those days.

Just 14, he and his gang of friends will have to find a new place to live.

And, at least sometimes, some members act like a gang.

Eight of the 10 state programs have had gang problems.

Every time I go outside, gangs look at me hard.

No one in my gang had ever met anyone quite like him.