<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Skip Navigation

12.19: Extracting Ores

Difficulty Level: Basic Created by: CK-12
Atoms Practice
Estimated1 minsto complete
Practice Extracting Ores
This indicates how strong in your memory this concept is
Estimated1 minsto complete
Estimated1 minsto complete
Practice Now
This indicates how strong in your memory this concept is
Turn In

How can you save energy and materials?

Getting ore from rock takes a lot of energy. Getting ore from preexisting materials uses a lot less. It turns out that if you recycle just 40 aluminum cans, you will save the energy in one gallon of gasoline. You will save aluminum too!

Ore Extraction

When the ore leaves the mine it is not yet a useful material (Figure below). Most ores are a combination of metal and other elements. The rocks are full of valuable minerals. They also contain rock that isn't valuable, which is called waste rock. The valuable minerals must be separated from the waste rock.

Enormous trucks haul rock containing ore from a mine site to where the rock is processed.

To separate the ore from the waste rock, first the rocks are crushed. Then the minerals are separated out of the ore. There are a few methods for doing this:

  • heap leaching: the addition of chemicals, such as cyanide or acid, to remove ore. This is often done at very high temperatures
  • flotation: the addition of a compound that attaches to the valuable mineral and floats.
  • smelting: roasting rock at a temperature greater than 900oC. This causes it to segregate into layers. The valuable minerals are then extracted. This requires a lot of energy.

Extracting metal from rock is so energy-intensive that it's much better to recycle. We use over 80 billion aluminum cans each year. If all of these cans were recycled, we would save the energy in 2 billion gallons of gasoline!


  • To extract ore from rock, the rock is first crushed.
  • Ore is extracted from rock by heap leaching, flotation or smelting.
  • Extracting ore from rock can take a lot of energy.


Use this resource to answer the questions that follow.

Discovery Atlas: Gold Mines at http://videos.howstuffworks.com/discovery/7243-discovery-atlas-gold-mines-video.htm (2:55)

  1. What is the Superpit?
  2. How large is the Superpit?
  3. How is gold extracted from this mine?
  4. What is Australia's rank in gold mining?
  5. What minerals is Australia the leading country for?


  1. Why does ore need to be extracted from rock?
  2. Why is does extracting ore from rock take a lot of energy?
  3. How is ore extracted from rock?

Notes/Highlights Having trouble? Report an issue.

Color Highlighted Text Notes
Please to create your own Highlights / Notes
Show More


flotation Adding a compound that attach to an ore mineral and floats.
heap leaching Adding chemicals that remove ore from rock.
smelting Roasting rock so that valuable minerals separate out.

Image Attributions

Show Hide Details
Difficulty Level:
6 , 7
Date Created:
Jan 04, 2013
Last Modified:
Sep 05, 2016
Files can only be attached to the latest version of Modality
Please wait...
Please wait...
Image Detail
Sizes: Medium | Original