The estimated quantity needed will be of around 5000 to 6000 tons per year (maybe more).

It weighs around 30 tons and rest upon two stones.

The total weight of the telescope is around 90 tons.

This would suggest that the total for the year was around 200,000 tons.

Until the early 1990s, the mine produced around 100 tons of coal per day.

Production in 1998 was around 305 tons, a decline of 1.61% since 1996, and 2% on farms.

The total weight of the batteries was around 30 tons.

If a liquid, like fuel, around ten to fifteen tons.

In 1990 the production of coal was around 500,000 tons per year.

In 2005 hard coal extraction was around 25 million tons.