How do we Mine Minerals?: Crash Course Geology #22

Summary

Minerals are essential to modern life. They are used in buildings, packaging, toothpaste, renewable-energy systems, electric vehicles, and electronics. A smartphone alone may contain about 42 different minerals. Human societies have relied on minerals for thousands of years, but today they use a wider variety—and larger quantities—than ever before.

How mining works

Mining is the extraction of minerals from the Earth. The video describes four main methods:

• Underground mining: Tunnels and shafts are dug deep into the Earth.
• Surface mining: Open pits or strips are cut into the land.
• In-situ mining: A chemical solution is injected underground to dissolve selected minerals, which are then pumped to the surface.
• Placer mining: Minerals are collected from stream-bed sediments; this method is commonly used for gold.

Mining is only the first step. The extracted material must also be processed and refined. This can require moving vast amounts of rock: the video estimates that producing one ton of copper may require processing up to 200 tons of ore, while producing one ton of cobalt may require roughly 1,500 tons.

Costs and challenges

Mining and mineral processing can damage landscapes, disturb ecosystems, increase erosion, and contaminate air, soil, and water. In-situ mining generally disturbs less surface land, but can still threaten groundwater. These impacts can harm nearby communities and workers; the video says about 15,000 miners are killed on the job each year.

Demand is also growing, especially for minerals used in renewable-energy technologies, including copper, nickel, chromium, zinc, cobalt, and lithium. “Critical minerals” are resources that are highly needed but difficult to obtain. They may be scarce, difficult to extract, or concentrated in countries that create supply-chain or political risks.

For example, lithium mined in Australia may be refined in China and used in a battery manufactured in California. The video notes that if the world reached net-zero carbon emissions by 2040, lithium demand would be 40 times its 2020 level.

Approaches to more responsible mineral use

The video outlines several possible solutions:

• Use fewer minerals in products. Designing more mineral-efficient technologies can reduce demand. Examples include an 80% reduction in the silver used in solar-cell materials over a decade and lower cobalt use in electric-vehicle batteries.
• Design products to last and be recyclable. “Green design” means planning for repair and recycling rather than building products with short lifespans through planned obsolescence. Governments could also set mineral-efficiency standards.
• Improve e-waste recycling. Discarded electronics totaled 62 million metric tons globally in 2022, and less than a quarter was properly recycled. Recycling must be safe and ethical: e-waste has often been sent from wealthier countries to poorer ones, where workers—including children—may dismantle devices by hand and face exposure to harmful substances. A 2024 United Nations report cited in the video found that e-waste recycling supplies only 1% of rare-earth-element demand.
• Build better recycling systems and hold producers responsible. Examples include programs in Croatia, South Korea, and India that require electronics companies to manage the e-waste they generate, as well as the European Union’s Waste Electrical and Electronic Equipment Directive, which requires member states to provide free e-waste recycling.
• Take individual and civic action. Recycle old electronics at appropriate centers, keep devices in use as long as possible, repair them when practical, and encourage companies and governments to take greater responsibility for environmental impacts.
• Develop circular-economy systems. In a circular economy, discarded materials are recovered and used to make new products. The video gives an example from the Critical Materials Institute at Ames National Laboratory: an environmentally friendly method for recovering rare-earth metals from old hard drives for use in new ones.

The video’s central message is that society will continue to need minerals, but meeting that need more responsibly will require coordinated work by geologists, companies, governments, and the public. Geologists can help by studying deposits, identifying mineral sources, and developing safer extraction methods.

Speakers and sources mentioned

• Sage: The video’s presenter and narrator.
• Dwayne: A Magic 8 Ball addressed briefly for an answer; it replies, “Reply hazy, try again.”
• United Nations: A 2024 report on e-waste recycling is cited.
• Critical Materials Institute at Ames National Laboratory: Credited with developing a method to recover rare-earth metals from old hard drives.
• European Union Waste Electrical and Electronic Equipment Directive (WEEE Directive): Cited as an example of a required e-waste recycling system.