Chapter 16 Outline

lyricalwillingMechanics

Feb 22, 2014 (3 years and 5 months ago)

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Jeffrey

Chapter 16 Outline



The General Mining Law of 1872



established to encourage settlement in the western states.
Allowed individuals, foreign or citizens, to make claim to certain land areas and profit from
anything the land produced. US lost a lot of money due to this.



Minerals are elements or compounds o
f elements that occur naturally in the Earth’s crust.
Examples
-

Sulfides, Oxides, Rocks, High
-
grade and low
-
grade ores, metals and non
-
metallic
minerals.



As magma cools and solidifies, it separates into layers and various concentrations of minerals are
fo
und in each layer. Main deposits found= iron, copper, nickel, chromium and other metals. This is
called
magma concentration
.



Hydrothermal processes

involve water that was heated deep in the Earth’s crust; water seeps
through and dissolves certain minerals
. Responsible for gold, silver, copper, lead, and zinc.



Sedimentation
= when weathered particles are transported by water and deposited as sediment
on the sea floor, deltas and riverbanks. Certain minerals dissolve in the water on their passage of
life. Re
sponsible for iron, manganese, phosphorous, sulfur, copper, and other minerals.



Inland lakes produce many salts after
evaporation

occurs
. Might be turned into rock layers.
Responsible for table salt, borax, potassium salts and gypsum.



In order to make
mi
neral deposits available 1) Deposit must be located 2) Mining extracts mineral
3) The mineral is processed and refined 4) Mineral is used to make a product.



Surface

mining/Subsurface Mining/Overburden



Subsurface= below ground; surface= removing soil, subs
oil and overburden (overlying rock)
to mine



Open Pit surface Mining
;
Strip Mining
= trench is dug.
Shaft mine
= direct vertical shaft to ore



Smelting=
ore is melted at high temps to separate impurities; Smelting caused the disaster at
Copperbasin, Tennessee



The extraction and disposal

of minerals are harmful to the environment. Surface mining
particularly destroys large areas of land. Open pit mining uses a lot of water. Mining affects water
quality through
acid mine drainage
. Cost benefit analyses should be

made before mines are
developed.



Tailings
=

impurities that become waste after mining. Smelting plants emit a large amount of air
pollutants.



Copperbasin, Tenn.
Destroyed due to open air smelting pits, acid precipitation from this caused
wildlife to cease, soil erosion was a huge problem, entire aquatic community killed due to runoff
from soil erosion and acid precip. It was trying to be turned into a
derelict lan
d
(land restored
from mining degradation)



Surface Mining Control and Reclamation Act

1977 law that requires reclamation of areas that
were surface mined for coal. But there is no federal law to require restoration of land.



Wetlands are a good way to clean
up mining lands such as Butte, Montana. Bacteria consume the
contaminated water that seeps into the land clearing it of sulfur and making the water less acidic.
Not cost effective though because it is expensive and lime can be used in its place.



Jeffrey



Phytoreme
diation
= the use of specific plants to absorb and accumulate toxins from the soil.
Hyperaccumulators

are an example.



Mineral Reserves
= deposits identified and profitable to extract.



Mineral Resources
-

undiscovered deposits that are currently unprofitable
to extract



Reserves+Resources= Total Resources or World Reserve Base



Reasons shortages of minerals never occurred

1.

New discoveries have been discovered

2.

Plastics and other synthesizers have replaced metals

3.

Global economic slump resulted in lower consumption
of minerals



Antarctic Treaty
-

1961 stated that Antarctica can only be used for peaceful studies.



Madrid Protocol
-

1990 moratorium on exploration for minerals at a minimum of 50 years.



Manganese Nodules


small rocks that contain manganese and other minerals at the bottom of
the sea floor. Not commercially feasible to obtain them.



UNCLOS
-

protects the ocean from being exploited.



Biomining
-

microorganisms used to extract minerals from low grade ores. All
ows recovery of
certain minerals that could be scattered throughout the ocean blue.



Reuse/Recycling



Sustainable Manufacturing
-

manufacturing system based on industrial waste minimization.
Requires that companies provide info on their waste products.



Industrial economies/Industrial ecology
-

I. Ecology
= extension of s. manufacturing because
it
seeks to use resources efficiently and uses wastes as potential products.
I. Ecology

-
> I. Ecosystem.



Dematerialization
-

a way of conservation/reduction because
as time goes on they are made
lighter. Compare an iPod in 2003 to an iPod in 2011. MUCH lighter.