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