ES Chapter 16
smelting
Crushed ore is melted at high temperatures to separate impurities from molten metal during
state and federal agencies
From whom must mining companies obtain permits before mining a site?
have no commercial value
Gangue minerals
atoms
Minerals are arranged in a regular, repeating geometric pattern of
returning land to its original, or better, conditions after mining iperations have been completed
Reclamation is the process of
at bends in rivers
Stream placers often occur
subsidence
The process by which land sinks with little or no horizontal movemtn is known as
open-pit mining
Which of the following is not a method of subsurface mining?
flooding of empty stream beds and rivers
Which of the following is not one of the ways that ore minerals may form?
sea glass
Which of the following would not be considered an aggregate?
open-pit mining
a mining method used for large ore deposits near the surface that are mined downward
hydraulic mining
a mining method used to recover gold from ancient riverbeds
mineral exploration
a process used by mining companies to identify areas where there may be valuable mineral resources
sulfuric acid
a water contaminant that can cause acid mine drainage
flux
material that bonds with impurities and separates them from molten metal during smelting
underground mine fires
one of the most serious consquences of coal mining
evaporites
salts left behind after evaporation
surface mining
the mining method used when shallow ore deposits are located close to Earth's surface
alloy
two or more metals combined
dissolved minerals
what hot, subsurface waters must contain in order to be considered hydrothermal solutions
