Exam 13: Mineral and Rock Resources

A rock or mineral from which a useful or metal can be extracted is referred to as a(an)

Underground mines do not cause disturbance of the land surface except at the mine entrance,either during or after mining.

We have probably already found most of the "easy ores" in accessible parts of the world.

If demand forces metal prices up,all of the following can be expected except

Sediment sorting and selective concentration of minerals via currents in a coastal environment that are mechanically concentrated by water are called

Producing new minerals by refining new ores and mining is more energy efficient than recycling.

The United States imports some minerals of which it has ample supplies and production exceeding current demands.

Whether a given ore deposit is economic depends on the metal concentration,not on the mineral in which that metal occurs.

Sulfide ore deposits are rare because they formed early in the earth's history,before there was very much oxygen in the atmosphere.

Gold is not now being extracted from seawater.What is the primary reason for it not being extracted?

Of which of the following does the United States have the best supply of reserves,relative to demand?

Limestone is the source for Portland cement,the principal binder for concrete on which the construction industry depends.

The minimum concentration factor necessary for profitable mining of an ore deposit depends on each of the following except

Geochemical prospecting involves analyzing all of the following except

Abandoned quarries

In a lifetime,an average American citizen will consume __________ pounds of mineral and fuel resources.

Dense minerals,like magnetite and native gold,may be concentrated in a crystallizing magma chamber by

The consumption of resources in the United States matchest their production.

Underground mining is the most hazardous occupation in the United States.

All of the following are mined from evaporite deposits except