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Hydrogen Cyanide and Cyanides: Human Health Aspects ,

This report contains the collective views of an international group of experts and does not necessarily represent the decisions or the stated policy of the United Nations Environment Programme, the International Labour Organization, or the World Health Organization...

Gold mining - Wikipedia

Placer mining is the technique by which gold that has accumulated in a placer deposit is extracted Placer deposits are composed of relatively loose material that makes tunneling difficult, and so most means of extracting it involve the use of water or dredging...

Corporate | Gekko

Gekko Systems is a company dedicated to driving change in the global minerals processing industry We have established a recognised leadership for developing cost-effective and beneficial equipment for a range of mineral sectors, including gold, diamonds, tin and tantalum...

Technological and industrial history of 20th-century ,

The technological and industrial history of Canada encompasses the country's development in the areas of transportation, communication, energy, materials, public works, public services (health care), domestic/consumer and defence technologi...

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