Ore Mineral Security (AQA A Level Geography)
Revision Note
Sources, distribution and trade of copper
A mineral is a naturally occurring inorganic solid with a crystalline structure
Ores are concentrations of minerals in rock high enough to be economically extracted for use
Deposits of copper are found in the Earth’s crust
Copper was first extracted and used in around 8000 BCE
One of the few metals that can occur naturally in a usable form
Copper deposits are found in many regions worldwide, but significant concentrations are focused in a few areas
The largest copper-producing countries are Chile, Peru, China, the United States, and Australia
Chile is the world's leading copper producer, with vast reserves and numerous mining operations
USA and Canada have significant copper deposits, with notable mines in Arizona, Utah, and British Columbia
Asia is a significant copper producer
Within Asia, China is the biggest producer and consumer of copper.
The distribution of copper deposits is influenced by geological processes, tectonic activity, and the presence of specific mineralised zones
Copper has various characteristics which gives it many uses in industrial and domestic settings
Conducts heat and electricity
Malleable and ductile
Durable
Copper oxidises by developing a green protective layer on its surface, called patina
This can preserve the inside of copper for thousands of years.
Anti-Bacterial
Recyclable
Over 80 percent copper ever mined and manufactured is still in use today
Uses of Copper
Category | Examples of uses |
---|---|
Electrical | Wiring for circuits, circuit boards, micro-cips, semiconductors, internet cable, electromagnets, solar panels |
Building construction | Piping for water and heating, heat exchangers in thermal power stations, irrigation systems, light fittings, door handles |
Transport | Vehicle radiators, oil coolers, heating systems, electric vehicle, aircraft control systems, shipping hulls |
The components of demand for copper include:
Technological advancements
Population change
Global economic conditions
Copper is traded around the world but two-thirds of copper concentrates are processed in their region of origin
Cheaper and easier
Copper content of ore is often low, with large percentage of waste rock
Refined in situ to save transport costs
Copper concentrate and processed copper products are traded as they are required by most countries
Supply of copper is often not in the same location as the major demand
Of the concentrate that is traded, the biggest flows are from South America to Asia
Recent trends in the global copper trade include:
Over 60% of global copper consumption is in Asia
In 1990 USA was the largest consumer of copper
By 2015 China had overtaken USA as the world's largest consumer of copper, accounting for nearly 40% of global demand
The biggest source of China’s copper imports is Chile
Almost 9 million tons from Chile in 2021
Driven by China’s economic growth and policies:
Rapid industrialisation
Infrastructure development
Urbanisation
China’s own copper reserves are plentiful but confined to small and medium sized mines
Increasing demand for electric vehicles (EVs)
Due to use in electrical wiring and components
Sustainable and responsible mining practices
Increasing focus on sustainable and responsible mining practices in the copper industry
Physical Geography of Ore
Physical geography of copper ore
Sources of Copper Ore and Key Aspects of Physical Geography
Ore mineral source | Description | Geological formation | Location |
---|---|---|---|
Porphyry ore deposits | Most common type of copper ore (60% of all supply) Low-grade - 1-2% copper content Often found alongside other minerals e.g. zinc and gold, so economically viable despite low content Extracted in open-cast pits | Formed in tectonic subduction zones Hydrothermal fluids escape from magma chambers into rock layers above to form mineral deposits | Along destructive plate margins E.g. Andes and Rockies mountain ranges |
Massive sulphide deposits | Higher grade - 2-5% copper content Less widespread than porphyry | Hydrothermal release of magma on seafloor as two plates pull apart Deposits merge with sediment and become embedded Over millions of years tectonic uplift of seabed above the sea level exposes deposits as land | Constructive plate margins along mid-ocean ridges Former ocean ridges now uplifted into land E.g. Otavi sediments of northern Namibia |
Strata bound copper deposits | Least widely distributed Richest in copper content - up to 6% | Copper-rich sea water interacts with sedimentary rocks, leading to chemical reactions and the deposition of copper in specific layers in ocean basins Over millions of years tectonic uplift of seabed above the sea level exposes deposits as land | The Copper Belt of the southern Katanga Province of the Democratic Republic of the Congo |
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