Tungsten is in every rocket engine, every missile guidance system, every aerospace turbine, and every armor-piercing round in the U.S. arsenal. SpaceX, Lockheed, Raytheon — the entire U.S. space and defense industrial base depends on it. Beijing controls 80% of global supply. The United States hasn't mined a kilogram commercially since 2015. Tungsten prices are up 557% since China's February 2025 export controls. Now a U.S.-backed company on the NASDAQ has secured the largest known undeveloped tungsten resource on Earth — nearly four times the size of the only Western tungsten producer in operation today.
Every Falcon 9 that lifts off from Cape Canaveral, every Starship that fires its Raptors over Boca Chica, every U.S. military satellite that gets carried into orbit — runs on a supply chain that depends on a single scarce metal. Tungsten. The densest commercially used metal on Earth. The element with the highest melting point of any in nature. The material the U.S. space and defense industrial base cannot replace — and the material that, today, China overwhelmingly controls.
In February 2025, the Chinese Ministry of Commerce announced that any company wishing to export tungsten would now need a license from Beijing. The notice ran a few paragraphs in length. The market reaction did not. Within twelve months, the global price of ammonium paratungstate had risen by more than 557 percent. By April 2026, Rotterdam was paying north of $3,000 per metric ton unit and getting in line behind the next buyer. The price chart looks like a heart-rate monitor going into cardiac arrest. And the cause is not scarcity. The cause is that one country owns the supply chain — and that country has decided to use it.
This is not an essay about whether China's grip on critical minerals matters. It plainly does. Every recent administration of both parties has said so. The Department of Defense classifies tungsten as a strategic material. The REEShore Act of 2022 prohibits Chinese-sourced tungsten in U.S. military equipment after 2026. The Pentagon has poured hundreds of millions into allied projects. The answer to whether the United States needs an alternative supply was settled years ago.
What was not settled is where that alternative would come from. Until now, the answer was a list of unfunded pilot projects, half-built mines, and partner countries with their own export complications. The world's largest known undeveloped tungsten resource, sitting beneath the steppes of central Kazakhstan, was not on the list — because it was held by a Kazakh state mining company with no U.S. partner. That changed in April 2026.
A small NASDAQ-listed company called Skyline Builders Group (SKBL) — itself a recent vehicle, taken over in late 2025 by a U.S. investor consortium with the explicit intent of acquiring critical-minerals assets — announced a merger with Cove Kaz Capital, a U.S.-backed mining company that had just closed on a 70 percent controlling stake in the Severniy Katpar tungsten venture. The combined entity, set to trade on the NASDAQ as Kaz Resources Inc. (KAZR), now controls a project containing roughly 1.4 million tonnes of tungsten trioxide — about 70 percent of all the tungsten in Kazakhstan, and the single largest undeveloped tungsten resource ever delineated outside of China.
The U.S. Export-Import Bank has already issued a Letter of Interest for up to $900 million in project financing. The U.S. International Development Finance Corporation has issued another for up to $700 million. Total project capex is estimated at $1.1 billion. The math, for the U.S. government, has clearly already been done.
There is a tendency to evaluate critical-minerals stories in the abstract. The honest test is to look at what just happened to the comparable company — and at the demand side that is paying record prices to keep the industries it serves in business.
Start with the comparable. The only U.S.-listed tungsten producer of meaningful scale operating today is Almonty Industries (NASDAQ: ALM). Almonty's flagship asset is the Sangdong Tungsten Mine in South Korea — historically one of the largest tungsten mines in the world, restarted in March 2026 after thirty years of dormancy. Sangdong's commissioning generated the kind of investor attention that critical-minerals projects rarely see in advance of production. Tungsten APT prices were already moving. Sangdong was the only Western mine in line to actually answer the supply gap.
The market noticed.
That is what the market did to a Western tungsten name with one producing mine, in a tungsten market that was up roughly five-fold from January 2025 lows. KAZR's Severniy Katpar deposit sits on the same supply-chain thesis as Sangdong, with one critical structural difference: it is materially larger.
Now look at the demand side. The single most visible part of the U.S. industrial base that depends on tungsten is the space and defense sector — and the most visible name in that sector is SpaceX.
Tungsten has the highest melting point of any pure metal at 3,410°C — higher than any other element in commercial use. It is the densest commercially used metal, at 19.3 grams per cubic centimeter, roughly 70 percent denser than lead. These two physical properties together make it irreplaceable in the highest-temperature, highest-stress applications in modern aerospace and defense — and there is no realistic substitute material for any of them.
That includes the U.S. space industrial base. SpaceX, the dominant U.S. launch provider, operates inside an industrial supply chain — propulsion, satellites, defense payloads, NASA contracts — in which tungsten is structurally embedded as a critical input. The company is also a primary contractor to the U.S. military's space programs. The same supply chain that puts SpaceX rockets in orbit is the supply chain currently dependent on Chinese tungsten — a dependency the U.S. government has spent the last three years working to end.
Here is the structural picture. The largest U.S. company in the segment of the economy most dependent on tungsten — SpaceX — operates inside a supply chain that has been told by the U.S. government, by law, that it cannot use Chinese tungsten in defense applications after this year. The only Western tungsten producer of meaningful scale today, ALM, has returned more than 1,400 percent in five years and trades at a multi-billion dollar market cap with one mine in production. The next mine in line — and the largest known undeveloped tungsten asset on Earth — is the resource KAZR has just secured. That is the setup. The rest of this piece walks through how it actually works.
Before the company, the problem. The problem is older than most investors realize, larger than the headlines admit, and now in active escalation.
Tungsten is the densest commercially used metal on the periodic table. It has the highest melting point of any pure element, at 3,410°C. It is the material of choice for armor-piercing kinetic-energy penetrators — the projectile you fire when you absolutely have to defeat the armor on the other side. It is in turbine blades, semiconductor manufacturing tools, cemented carbide drilling tools, radiation shielding, and increasingly EV components. Of all the elements the U.S. military depends on, tungsten is one of the few for which there is no realistic substitute. It is also one of the few of which the United States produces precisely zero.
The last commercial U.S. tungsten mine ceased production in 2015. The U.S. National Defense Stockpile of tungsten has been below 50 metric tons for the past decade — a fraction of one year of consumption. Approximately 50 percent of U.S. tungsten consumption is imported, and historically a significant share came from China, which produces around 80 percent of the global supply.
Then, on February 4, 2025, the Chinese Ministry of Commerce announced export controls on tungsten and several other critical minerals. The mechanism was elegant. Rather than cutting off exports outright, China required a license for each shipment. Approval rates fell. Volumes contracted by approximately 40 percent year-on-year. In December 2025, Beijing went further: only 15 designated companies would be permitted to export tungsten in 2026 and 2027. In February 2026, China prohibited tungsten exports to twenty Japanese entities deemed to support Japan's military. Selective enforcement. Strategic targeting. The textbook version of weaponized supply chain dominance.
It is the operating logic of Great Powers Era 2.0. Supply chains are no longer passive networks — they are strategic instruments of state power. Control of processing, not mining, defines dominance.
— Multi-institutional analysis on China's 2026 export controlsThe result, in market terms, has been the most violent re-pricing of any industrial metal in 2026. Tungsten APT prices in Rotterdam rose from roughly $900–$940 per metric ton unit in January 2025 to over $3,000 per mtu by late April 2026 — a move of more than 200 percent in 2026 alone, and 557 percent since the original February 2025 export controls were imposed.
*Feb 2025 marks China's initial tungsten export-control announcement. Prices rose sharply in the weeks immediately following, then again on each subsequent escalation through 2025–2026. The trend has been one-way. Inventories outside China are at record lows.
Multi-institutional analyses estimate the West would need 20 to 30 years to rebuild fully independent critical-mineral supply chains. The current geopolitical window is shorter than that. Much shorter.
In a market where supply is the constraint, the binding question becomes simple: where is the next significant non-Chinese tungsten mine going to come from? The honest answer, as of April 2026, is Kazakhstan.
Kazakhstan holds roughly 2 million tonnes of tungsten resources — about 13 percent of global resources, the second-largest national endowment in the world after China. Most of that resource has been undeveloped for decades, partly because Kazakhstan's mining sector was historically organized around uranium, copper, and oil. Tungsten was a secondary asset, held by the state mining company Tau-Ken Samruk, awaiting a partner with the capital and the markets-access to develop it.
That partner became Cove Kaz Capital Group — a U.S.-backed exploration and mining company structured specifically as a vehicle to bring Kazakh critical-minerals assets into the U.S. supply chain. In November 2025, Kazakhstan signed a memorandum of understanding with the United States on critical minerals. Inside the same window, Cove Kaz secured the right to acquire a 70 percent controlling interest in Severniy Katpar LLP — the joint venture holding the Northern Katpar and Upper Kairakty tungsten deposits, two adjacent deposits in the Karaganda mining district less than 20 miles apart.
The deal closed on April 29, 2026. The day after, Skyline Builders Group (NASDAQ: SKBL) and Cove Kaz announced their merger to create Kaz Resources Inc. (NASDAQ: KAZR), with Tau-Ken Samruk retaining 30 percent of the venture as a strategic Kazakh state partner.
The scale matters. A 1.4-million-tonne WO₃ resource is not a marginal mine. It is, on a global resource basis, multi-generational. By comparison, China's annual tungsten production sits around 67,000–69,000 tonnes. A meaningful fraction of multi-decade Western tungsten demand could in principle be supplied from this single project.
And it is not just tungsten. Cove Kaz also holds a 75 percent interest in the Akbulak rare-earth project, in joint venture with Qazgeology (a subsidiary of Tau-Ken Samruk). And through its wholly owned subsidiary Kaz Critical Minerals, the combined company holds 15 mineral exploration licenses in Kazakhstan covering rare earth elements, lithium, tantalum, beryllium, niobium, cesium, and tin — the entire shopping list of strategic minerals a U.S. defense-and-industrial supply chain has been told it needs. Kaz Critical Minerals is, per company materials, the first U.S.-linked entity to receive critical-minerals and rare-earth land concessions in Kazakhstan.
Mining projects of this scale do not advance on geology alone. They advance on capital and on government alignment. KAZR has both — and the political dimension is one of the most underappreciated parts of the setup.
Start with the U.S. agencies. Two separate Letters of Interest have already been issued: up to $900 million from the Export-Import Bank of the United States, and up to $700 million from the U.S. International Development Finance Corporation. Together: $1.6 billion of indicative U.S. government project finance support targeting a project with $1.1 billion of estimated total capex. Letters of Interest are not commitments — they are signals of readiness to engage on financing once the project advances through feasibility. But they are the kind of signal a project either receives or does not, and KAZR has received both.
Layer in the broader U.S.–Kazakhstan diplomatic picture. In November 2025, the two countries signed a memorandum of understanding on critical minerals, framed inside the Trump administration's stated priority of reducing U.S. dependence on Chinese supply. The Severniy Katpar deal sits squarely inside that policy track. Kaz Critical Minerals is the first U.S.-linked entity to receive critical-minerals concessions from Kazakhstan, and that did not happen by accident.
And then, separately, a piece of color reported by the Financial Times: a shell company associated with Donald Trump Jr. and Eric Trump has acquired a stake in the Skyline Builders side of the deal. According to securities filings cited in the FT report, the Trump-linked vehicle paid roughly $20 million for a 20 percent stake in the company that became KAZR. The investment is private and reasonable people will read its significance differently. What it concretely indicates is that capital aligned with the current administration's stated critical-minerals strategy is in the deal — at the equity level, not just the financing level.
Taken together, the political picture is unusually coherent for a mining-stage company. A Kazakh state JV partner. A U.S.–Kazakhstan critical-minerals MOU. EXIM Bank. DFC. Trump-family-linked capital at the founding share-class level. The capital stack and the political stack point in the same direction.
Strip the geopolitics and ask the simple investor question: what is being offered, what does it cost, what could it become.
What is being offered, today, is a NASDAQ vehicle (currently SKBL, transitioning to KAZR upon merger close in Q4 2026 or Q1 2027) that controls — pending regulatory and shareholder approvals — a 70 percent stake in the largest known undeveloped tungsten resource on Earth, plus a 75 percent stake in a rare-earth project, plus 15 additional critical-minerals concessions in Kazakhstan. The asset base is real, the JORC resource is independently confirmed, the U.S. government financing channels are open, and the underlying commodity is at all-time highs in a structural supply deficit.
What it costs depends on when you look. SKBL is a small-capitalization stock. The pre-merger market is pricing a development-stage critical-minerals vehicle, not a producing miner. The transition takes years: a Definitive Feasibility Study commencing in the second half of 2026, project financing close, construction, commissioning, ramp. Investors buying KAZR today are buying a multi-year option on the asset reaching production at or near current commodity prices, with U.S. agency financing assumed to convert from Letters of Interest to actual debt facilities along the way.
What it could become is the asset that anchors a non-Chinese tungsten supply chain for the next quarter-century, with a producing-miner valuation tied to a 1.4-million-tonne WO₃ resource at materially higher commodity prices than any post-1980 tungsten producer has ever sold into. That is not a guarantee. It is the optionality investors are being offered.
No critical-minerals development project is without risk. KAZR has more than its share — and an investor who has not priced these in is not actually evaluating the opportunity.
None of these are dismissive. Each is real, documented, and would be flagged by a competent due-diligence process. The point is to make sure anyone reading further has weighed them.
The defensible version of the KAZR thesis: tungsten is in a structural supply crunch driven by Chinese policy that is unlikely to fully reverse; KAZR controls the single largest undeveloped non-Chinese tungsten asset in the world; U.S. government financing channels are aligned; the equity is a multi-year option on that asset reaching production. Investors comfortable with development-stage mining risk and a multi-year horizon can rationally take a position in that framework. Investors who require near-term cash flows or low jurisdictional risk should not.
Review the official transaction documents, SEC filings, JORC resource statement, and the latest investor presentations directly from the company.
>View Investor Profile → Sponsored content · Not investment advice · NASDAQ: SKBL → KAZRAll statistics in this brief are drawn from public filings, company press releases, government agencies, and recognized industry data providers as of late April 2026. URLs are provided for direct verification.
Notes on methodology: Mineral resources are JORC-compliant resource estimates from feasibility-stage work; resources are not the same as reserves and a project of this stage has no producing economics. The KAZR ticker and combined entity are pending merger close in Q4 2026 or Q1 2027 and subject to shareholder, regulatory, and SEC registration approvals. Tungsten APT price benchmarks reflect Rotterdam and European duty-free assessments and may differ materially from Chinese domestic pricing or contract pricing actually paid by individual buyers. All Letters of Interest from U.S. agencies are non-binding indications of engagement, not financing commitments. Market data is point-in-time and subject to continuous change.