Types of Mining Flashcards
1
Q
Surface Mining
A
shallow deposits are removed
2
Q
Subsurface Mining
A
deep deposits are removed
3
Q
Open Pit Mining
A
machines dig holes and remove ores
toxic groundwater accumulated at bottom
4
Q
Area Strip Mining
A
Earth movers strips away overburden
Leaves spoil banks
5
Q
Highly erodible hills of rubble
A
spoil banks
6
Q
Contour Strip Mining
A
Used on hilly or mountainous terrain
7
Q
wall of dirt left in front of a highly erodible bank
A
highwall
8
Q
Mountaintop Removal
A
machinery removed the tops of mountains to expose coal
9
Q
The environmentally worst type of mining
A
Mountaintop Removal
10
Q
Time it takes to use up to 80% of a resource at a given rate of use.
A
Depletion Time
11
Q
number of years that proven reserves will last at current annual production rates
A
Reserve-to-production ratio
