Spruce Pine is home to the world's purest quartz mine, and Sibelco is the leading quartz refiner for the semiconductor industry.
Appalachian and Spruce Pine – this region is not a wealthy area; the town center consists of only a train station, a few rows of two-story brick buildings, and a long-closed movie theater. However, the surrounding mountains are rich in desirable minerals, some valuable for industrial use, particularly quartz.
However, unlike any other type of quartz on Earth, Spruce Pine contains the purest natural quartz. This exceptionally superior deposition of silicon dioxide particles plays a crucial role in the production of silicon used to manufacture semiconductor chips.
Glover, a retired geologist who spent decades hunting for valuable minerals in the hillsides and depressions of the Appalachian and Spruce Pine ranges, assessed: "It's a multi-billion dollar industry here," Glover told Wired with a hearty laugh. "You wouldn't know it while driving through here, and you probably never will."
Sibelco's plant complex in Spruce Pine. Photo: Sibelco
In the 21st century, sand has become more important than ever, especially in the semiconductor industry. Most of the world's sand is composed of quartz, a form of silicon dioxide, also known as silica. High-purity silicon dioxide particles are essential raw materials for manufacturing computer chips, fiber optic cables, and other high-tech hardware. The amount of quartz used for these products is small compared to the mountains of quartz used to improve concrete or soil. But its impact is immeasurable in the digital age.
Refining pure quartz is extremely difficult, but Spruce Pine is blessed with an enormous deposit of what is considered the purest quartz in the world. It is the result of a unique geological history; approximately 380 million years ago, geological movements between the African and American continents created friction with temperatures exceeding 2,000 degrees Celsius, melting layers of rock known as pegmatite. One hundred years later, this molten rock, buried deep underground, cooled and recrystallized. Through geological activity, it began to rise to the surface.
For years, locals mined pegmatite, crushing it with hand tools or rudimentary machinery, separating the feldspar and mica for use, while quartz was considered "junk," only suitable for construction sand or discarded. However, in the mid-1950s, thousands of miles from North Carolina, a group of engineers in California began researching pure quartz for semiconductors.
At that time, the transistor market was rapidly heating up. Texas Instruments, Motorola, and other companies began a race to create smaller and more efficient transistors for use in computers. Some of the materials found in transistors were germanium and silicon.
Sibelco mines quartz ore in Spruce Pine. Photo: Sibelco
The breakthrough came in 1959, when Robert Noyce and his colleagues at Fairchild Semiconductor found a way to cram multiple transistors into a piece of high-purity silicon the size of a fingernail. NASA selected Fairchild's microchips for use in its space exploration programs, and the company's chip sales have skyrocketed ever since.
Creating those chips is an incredibly complex process. Essentially, they require pure silicon, because even the slightest impurity will ruin everything. Finding silicon is easy because it's one of the most abundant elements on Earth. However, it requires many extraction steps. Using pure quartz would significantly reduce both time and cost.
Typically, sand is heated in an electric furnace at high temperatures to induce a chemical reaction that removes most of the oxygen, retaining 99% pure silicon. However, that's not enough. Silicon for solar panels must be 99.999999% pure, and for computer chips, the requirements are even stricter, 99.99999999999%. But with quartz from Spruce Pine, purity can reach 99.998%, or even 99.9992% – a factor that significantly reduces the cost of removing impurities.
Quartz after being refined. Photo: Sibelco
But even with pure quartz, not everyone can refine pure silicon. "The modern economy sits on a single road in Spruce Pine, which leads to the facilities of Sibelco North America, a company that mines and refines ultra-high-purity quartz," Professor Ethan Mollick, an AI and semiconductor research expert at the University of Pennsylvania's Wharton School of Business, told Tom's Hardware .
On its website, Sibelco also claims to be "the sole supplier of quartz for refining silicon wafers in chip manufacturing." However, the company's existence is not as well-known as TSMC, Intel, ASML, or Samsung in the semiconductor industry.
Some experts believe that Sibelco's dominance is demonstrated by the fact that the fused quartz it produces offers "excellent" optical, mechanical, and thermal properties for the production of semiconductors, photovoltaic cells in solar panels, and optical fibers in telecommunications cables.
According to Mollick, the importance of Sibelco in particular and Spruce Pine in general is immense. Quoting from Conway's book *The Material World* and published on X on March 24th, he argues that there would be "the end of computer chip production" if something bad were to happen at Spruce Pine or in the skies above it.
"Regardless of the reason, any sudden shutdown or disruption to quartz mining operations at Spruce Pine could cause a 'pretty catastrophic' incident, potentially slowing down the chip manufacturing sector for years," Mollick added.
Bao Lam
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