Reading an article on your phone or computer is made possible by quartz. This ancient mineral, present on Earth for millions of years, is now highly coveted for its exceptional purity by leading semiconductor and microchip manufacturers. Quartz has become an indispensable and strategically vital resource for major global powers.
While quartz is one of the most abundant minerals in the Earth’s crust—forming a significant component of sand, for instance—a remote location nestled at 800 meters above sea level has emerged as a crucial cog in the world’s economic engine. Here, quartz commands prices exceeding 20,000 euros per ton. This pivotal site is the Spruce Pine mine, tucked away in the Appalachian Mountains of North Carolina, United States.
Today, quartz is fundamentally essential for countless companies that rely on it to develop microchips and semiconductors. These tiny electronic brains are the core components within computers and smartphones, processing information and enabling the seamless operation of our daily applications.
“We are in the midst of developing the components industry, which necessitates materials of extremely high purity,” explains Laurent Carroué, a geographer and research director at the French Institute of Geopolitics at Paris VIII.
This is where the Spruce Pine mine in the Appalachians, seemingly isolated from the rest of the world, plays its critical role. The Spruce Pine mine is unique because it yields some of the purest quartz found globally. This exceptional purity is attributed to “a specific geological phenomenon, which, in its particular technical and geological configurations, is indeed a rare occurrence.”
Approximately 380 million years ago, significant tectonic shifts occurred in the region without water infiltration, crucially preventing the introduction of metallic impurities. As a result, Spruce Pine quartz is considered to be 99.999% pure.
This extraordinary purity makes it highly sought after, as “it is integral to the refining of molten polysilicon for wafer production.” Simply put, high-purity quartz is indispensable because of its ability to withstand extremely high temperatures. During the final phase of chip design, polysilicon is heated to approximately 1,400°C within large quartz crucibles. Without these specialized vessels, it would be impossible to create the small silicon wafers, which serve as the foundation for incorporating and interconnecting electronic components.
Geopolitical leverage and industrial sovereignty
Despite its strategic significance for the United States, there are no plans for nationalizing the Spruce Pine mine. Currently, two foreign entities compete for the exploitation of its deposits: Sibelco, a Belgian group, and The Quartz Corp, a Franco-Norwegian enterprise. As Laurent Carroué emphasizes, these geological formations are inherently “non-transferable and non-relocatable,” much like the uranium mines in Niger, which have attracted significant interest from major powers in recent years.
The Spruce Pine mine thus holds a near-monopoly on ultra-high-purity quartz. However, other sites across the globe exist that “circumvent local, national, and global scale logics.” Russia, China, and Brazil also possess production capabilities, though these often come with exorbitant costs, they are nonetheless real.
In June 2026, several Chinese media outlets, including the South China Morning Post, reported that researchers had made significant discoveries in Tibet and Xinjiang, revealing quartz mines with purity levels nearly equivalent to Spruce Pine. China, currently reliant on the Appalachian region for pure quartz, aims to invest heavily to reduce its imports.
The global market for rare minerals, a sector previously “90% controlled by China, has become a point of contention with Washington, prompting the United States to embark on the rehabilitation of previously abandoned mines in the American West,” notes Laurent Carroué. The geographical factors attest to a certain “plasticity leading in the long term to a mobility of strategic functions across territories,” so long as a resource is not depleted, the geographer reminds us.
Navigating risks and vulnerabilities
In the face of increasingly severe and frequent climatic events, rapid response is paramount. In October 2024, Hurricane Helene made a direct hit on the American East Coast. While inland damage was more moderate, the Appalachian region did not escape unscathed.
Key roadways became impassable due to fallen trees and had to be closed, leading to a several-week halt in production at Spruce Pine. During this period, Bloomberg famously described Spruce Pine as the “four most critical square kilometers for the global supply chain.” Although markets did not collapse, a prolonged blockage would have undeniably triggered a significant surge in prices.
Such a scenario would likely stimulate the search for substitutes or alternative solutions. While the advancement of artificial intelligence faces a shortage of ultra-high-performance chips, Sibelco responded to demand by investing over 200 million dollars in Spruce Pine in 2025, as reported by Exponential Industry magazine. Conversely, with solar panels falling out of favor, reduced demand compelled The Quartz Corp to close one of its Appalachian facilities.
The European continent possesses exploitable resources, particularly through deposits located in Norway. However, for Laurent Carroué, breaking free from American dependence “would require accepting initially less pure minerals and financing substantial infrastructure” for their refining. In the long term, an alternative could emerge beyond geographical constraints: the development of synthetic quartz in laboratories offers a viable technical option within a five-to-ten-year horizon. The transition to this substitute would then no longer hinge on the richness of underground resources, but rather on a major political and financial decision.
