Copper to Indium: Driving innovation and sustainability
Canada’s critical minerals are the backbone of modern technology, sustainable energy, and industrial innovation. With the 2024 addition of High-Purity Iron, Phosphorus, and Silicon Metal to its critical minerals list, Canada continues to solidify its role as a global leader in supplying materials that drive progress.
In this second installment of our alphabetical series for the Critical Minerals Review, we explore the next six critical minerals after cobalt—copper, fluorspar, gallium, germanium, graphite, and indium. These minerals power everything from electric vehicles to touchscreens, showcasing their vital contributions to Canada’s economy and the world’s technological advancements.
Copper: The backbone of connectivity
Copper’s exceptional electrical and thermal conductivity makes it indispensable across industries. In electrical systems, copper is the go-to material for wiring, cables, and circuit boards, enabling efficient power transmission in homes, industries, and renewable energy systems like wind and solar farms. Its reliability ensures minimal energy loss, critical for Canada’s push toward greener energy solutions.
In construction, copper’s durability and corrosion resistance shine in plumbing, roofing, and architectural cladding. Its antimicrobial properties also make it ideal for high-touch surfaces in health care settings, reducing the spread of infections.
The transportation sector increasingly relies on copper for electric vehicles (EVs), where it is used in motors, batteries, and charging infrastructure. A single EV can contain up to 80 kilograms of copper, highlighting its role in the transition to low-carbon mobility.
Copper alloys, such as brass and bronze, are valued for their strength and aesthetic appeal in applications like marine hardware, musical instruments, and decorative fittings. Additionally, copper’s recyclability—nearly 80 per cent of all copper ever mined is still in use—supports Canada’s circular economy goals.
Fluorspar: The enabler of industrial processes
Fluorspar, or fluorite, is a key source of fluorine, critical for a range of industrial applications. Its primary use is in the production of hydrofluoric acid, a precursor for fluorochemicals used in refrigerants, pharmaceuticals, and agrochemicals. These compounds are vital for cooling systems and medical advancements.
In metallurgy, fluorspar serves as a flux, lowering the melting point of ores and improving efficiency in steel and aluminum production. Canada’s fluorspar deposits, particularly in Newfoundland and Labrador, support these industries while fostering economic growth in mining communities.
Fluorspar is also used in optical lenses and ceramics due to its clarity and low refractive index. In the energy sector, fluorine-based electrolytes in lithium-ion batteries enhance performance, making fluorspar a quiet but essential player in the clean energy revolution.
Gallium: Powering advanced electronics
Gallium’s low melting point and unique semiconductor properties make it a cornerstone of modern electronics. Gallium arsenide and gallium nitride are critical in high-efficiency solar cells, LEDs, and power electronics. These materials enable faster, more efficient devices, from smartphones to 5G infrastructure.
In aerospace and defense, gallium-based semiconductors are used in radar systems and satellite communications due to their ability to operate at high frequencies and temperatures. Canada’s gallium production supports these high-tech industries, positioning the country as a key supplier in global markets.
Gallium is also used in medical imaging, particularly in gallium-based radiopharmaceuticals for cancer diagnostics. Its versatility underscores its growing importance in both technology and health care.
Germanium: Enhancing optics and connectivity
Germanium’s optical properties make it invaluable in infrared optics, fiber optics, and solar cells. In telecommunications, germanium is used in optical fibers to transmit data at high speeds, supporting Canada’s expanding digital infrastructure.
Infrared lenses made from germanium are critical in night vision systems, thermal imaging cameras, and military applications. These lenses enable precise detection in low-light or high-heat environments, serving defense, search-and-rescue, and industrial monitoring.
Germanium also enhances the efficiency of multi-junction solar cells used in satellites and concentrated solar power systems. Canada’s germanium resources contribute to these high-tech applications, driving innovation in renewable energy and connectivity.
Graphite: The foundation of energy storage
Graphite is a linchpin in the energy storage revolution, particularly in lithium-ion batteries, where it serves as the anode material. With the global demand for EVs and grid storage soaring, Canada’s graphite deposits, especially in Quebec and Ontario, are critical for meeting supply needs.
Beyond batteries, graphite’s high thermal resistance and lubricity make it essential in industrial applications. It is used in refractories for steelmaking, lubricants for high-temperature environments, and as a moderator in nuclear reactors.
Graphite’s conductivity also supports its use in fuel cells and graphene production, an emerging field with applications in flexible electronics and medical devices. Canada’s investment in graphite mining positions it as a leader in sustainable energy solutions.
Indium: Enabling touchscreens and solar power
Indium’s primary use is in indium tin oxide (ITO), a transparent conductor critical for touchscreens, flat-panel displays, and solar panels. Nearly every smartphone, tablet, and modern display relies on ITO for its clarity and conductivity.
In solar energy, indium is used in copper indium gallium selenide (CIGS) thin-film solar cells, which offer flexibility and high efficiency. These cells are increasingly adopted in building-integrated photovoltaics, supporting Canada’s renewable energy goals.
Indium’s low melting point also makes it valuable in low-temperature solders and alloys for electronics and aerospace components. Canada’s indium production, though modest, supports these high-value applications, reinforcing its role in global supply chains.
From copper’s role in electrifying the future to indium’s touch in modern displays, these six critical minerals highlight Canada’s strategic importance in global supply chains. As industries evolve and demand for sustainable technologies grows, copper, fluorspar, gallium, germanium, graphite, and indium will remain at the forefront of innovation.
In the next installment, we’ll explore the next set of critical minerals, uncovering their contributions to Canada’s economy and the world’s technological advancements.
