Quizz 1: Rocks and minerals and their exploitation

What is a greenfield site?

• Areas that have never been mined before

• Rock and soil overlying an economically viable mineral deposit

• Type of mining

• Areas that have already been mined

The strike rate suggests the frequency with which attempts to find a desired mineral are successful. Which of the following strike rates represent a mineral that is difficult to find?

• 1:50

• 1:100

• 1:1000

What is a brownfield site?

• Areas that have already been mined

• Areas not viable for mining

• Rocks formed from heat and pressure

• Sites with a higher strike rate

The working life of a mine can be estimated. Which factors have to be considered?

• Climate

• Size of the mineral deposit

• Rate of extraction

• All

Mining projects are strongly connected with demand and supply. What do these two terms mean?

• Supply: amount of the resource that is known to exist.

  Demand: amount that people need.

• Supply: amount that people need.

  Demand: amount of the resource that is known to exist.

• Supply: money needed.

  Demand: money available.

What are the three steps that have to be taken when mining rocks and minerals?

Which method of extraction is more dangerous?

• Open cast

• Shaft mining

• Open cut

• Open pit

Open-cast mining is used when a valuable deposit is located deep below the surface

• TRUE

• FALSE

Which of the following stages does deep mining or shaft mining involve?

• Clear the vegetation and top soil

• Digging a vertical shaft

• Making a horizontal tunnel following the mineral layer

• Break up rock by the use of explosives.

When the Earth´s crust first formed, what was the only type of rock present?

• Metamorphic

• Igneous

• Sedimentary