Chapter 15

Adverse environmental effects of mining include ___(1)___ of toxic metals from waste dumps, ___(2)___ causing sinkholes, and ___(3)___ that destroys the surrounding ecosystem.

(1) Leaching (2) Subsidence (3) Acid Mine Drainage

"Ore" is rock with a concentration of ore ___(1)___ that contain a high proportion of ___(2)___ in a form that can be ___(3)___

(1) Minerals (2) Metals (3) Extracted

Material holding bricks together is called ___(1)___ , whereas ___(2)___ is material that consists of limestone, sand, and clay

(1) Mortar (2) Concrete

An economic deposit contains both ___(1)___ minerals and ___(2)___ minerals, the latter are separated from the former as they are non-economic.

(1) Ore (2) Gangue

How is a placer deposit formed?

Accumulation of heavy minerals by water currents

If you're prospecting for a metallic ore, each of the following will help you locate a possible ore deposit EXCEPT:

Digital elevation models

Which of the following best describes deposits of bauxite?

Residual mineral deposits in soil that has everything leached out except aluminum

Crushed ore is melted at high temperatures to separate gangue minerals from molten metal during

Smelting

The process by which land sinks with little or no horizontal movement is known as

Subsidence

Stream placers often occur

at bends in rivers

Which of the following is NOT one of the ways that ore minerals may form?

flooding of empty stream beds and river

Gangue minerals

have no commercial value

Reclamation is the process of

returning land back to its original condition after mining

What is meant in terms of mineral reserves?

the known quantity waiting to be mined