Production had reached almost eight million tonnes and the number of employees was 23,633.
The total capacity of the ship locks is expected to reach 100 million tonnes.
Peak production is expected to reach 80 million tonnes per year.
In April 1993, total production reached 1.243 million tonnes.
Production at the Scottish quarry has now reached six million tonnes a year.
This reversed many of the problems, and by 1996 production reached 1.76 million tonnes.
Its annual capacity is expected to reach almost 15 million tonnes by 2015.
Total production of ferroalloys in 2007 reached 2 million tonnes.
The global chelating agents market is expected to reach more than 5 million tonnes in 2018.
It is estimated that such waste will reach 12.3 million tonnes by 2020.