America finally found its tungsten. NASA closed a third of the claims.

3 Proton Lithium reported 1.78 million tons of inferred tungsten in Nevada on August 3, five times the next largest US deposit. A 2023 land order reserved 22,684 acres for satellite calibration.

The largest tungsten resource ever reported in the United States sits in Nye County, Nevada, and the agency standing between it and a drill rig is not the EPA. It is NASA. On August 3, privately held 3 Proton Lithium released an updated resource report for its Railroad Valley Minerals Project claiming an inferred tungsten resource of approximately 1.78 million tons, more than five times the largest tungsten resource currently listed in the country [3 Proton Lithium via PR Newswire, August 3, 2026]. The Financial Times reported the constraint the same week. NASA opposes mining on about one third of 3PL’s claims, and the Bureau of Land Management has the ground locked [MINING.com citing Financial Times, August 4, 2026].

The lock is precise and public. Public Land Order No. 7921, effective April 27, 2023, withdrew 22,684.07 acres of public land in Railroad Valley from mineral entry, location, leasing and mineral material disposal for a period of 20 years, and reserved it for NASA satellite calibration [Federal Register, PLO 7921, April 27, 2023]. That is roughly 35 square miles, closed until 2043. Several secondary accounts of this story have put the figure near 17 square miles. The land order is the controlling document and it says 22,684.07 acres.

This is the fourth chapter in a story this desk has tracked since June. Tantalum covered tungsten as scrap being bid out of American recycling yards at prices up roughly 350 percent in twelve months (June 9), as Kazakh ore drawing up to $1.6 billion of prospective US government financing while Brazil sent no delegation to Astana (June 13), and as tungsten hexafluoride, the gas that plates the wiring inside memory and logic chips, at $149.79 per kilogram in April (July 29). Each chapter ended in the same place. The United States consumes the metal that wires AI accelerators and produces effectively none of it.

What’s happening

3PL reports 1.78 million tons of inferred tungsten, alongside measured resources of 31 million tons of lithium carbonate equivalent within a 118.9 million ton deposit, 533 million tons of potash, and 87 million tons of borate minerals, across 39,000 acres of leases [3PL via PR Newswire, August 3, 2026].
The company puts gross in-ground value for the four minerals at roughly $3.5 trillion, and MINING.com cites an in-situ tungsten value near $152 billion [MINING.com, August 4, 2026]. Treat both as promotional arithmetic. In-ground value is not a reserve and not a cash flow.
The tungsten is classified inferred, the lowest confidence category. The lithium, potash and boron are reported as measured. The headline number belongs to the least certain of the four.
The withdrawn ground is not included in the resource estimate [MINING.com, August 4, 2026]. The 1.78 million ton figure describes what 3PL can currently reach, not the deposit.
The United States has not mined tungsten commercially since 2015 [3PL via PR Newswire, August 3, 2026]. Prices are up nearly 600 percent since early 2025, and China controls about 80 percent of global production [MINING.com, August 4, 2026].
Railroad Valley holds a FAST-41 designation. 3PL is lobbying to reverse the withdrawal, arguing it was imposed without complete geological information. NASA says its position is unchanged [MINING.com, August 4, 2026].

US angle

Washington has spent eighteen months buying tungsten exposure nearly everywhere except at home. The Kazakh project under consideration for up to $1.6 billion of federal support sits in the Karaganda Region, backed by an Export-Import Bank commitment of up to $900 million and a DFC commitment of up to $700 million [MINING.com, August 4, 2026; Tantalum Strategy, June 13, 2026]. Railroad Valley is in Nevada. The same administration that placed the project into FAST-41 presides over the land agency holding PLO 7921 in force.

NASA’s reason is specific and not frivolous. The flat playa is used to calibrate satellite instruments and to receive and verify satellite signals, and the agency describes the site as unique [MINING.com, August 4, 2026]. This is not a permitting story with a villain. It is two defensible federal priorities pointed at the same 35 square miles, with no process that ranks them.

One technical detail cuts against the conflict framing. 3PL proposes solution mining, recovering soluble salts from depths of 1,200 to 2,800 feet through 80-acre surface footprints, avoiding the open pits, waste rock and acid plants hard-rock extraction requires [3PL via PR Newswire, August 3, 2026]. Whether a calibration playa can coexist with wellheads is a question neither party has answered publicly with data.

China angle

Beijing put tungsten on the dual-use export control list on February 4, 2025, through Ministry of Commerce and General Administration of Customs Decision No. 10 of 2025. The controlled tungsten items are named explicitly and include ammonium paratungstate, tungsten oxide, non-controlled tungsten carbide, tungsten-nickel-iron and tungsten-nickel-copper alloys, and the production technologies for all of them [IEA Policies Database, entry 26795].

The control was written at the intermediate level, not the ore level. That is the design that matters. APT is the intermediate that feeds both defense-grade tungsten metal and the WF6 gas fabs use, so controlling it binds tighter than controlling concentrate. Tantalum’s SOV50 carries tungsten at an HHI of 0.65 with China at roughly 80 percent of production, in the high concentration bucket. Nothing in Nevada changes that. Market experts cited in the reporting put production at least five years away [MINING.com, August 4, 2026], so China’s leverage over the tungsten input to AI chip interconnects runs through 2031 on this project’s own timeline.

Brazil angle

Brazil is the Latin American name in tungsten and it is still an exploration story rather than a supply answer. The Seridó Mineral Province, spanning Rio Grande do Norte, Paraíba and eastern Ceará, is the region’s most productive scheelite district [Tantalum Strategy, June 9, 2026]. In April, Perpetual Resources (ASX:PEC) mobilised a maiden field exploration programme across an 8,714 hectare landholding at its Paraíba Tungsten Project, targeting skarn and structurally controlled scheelite [Grafa, April 16, 2026]. The company’s shares were reported at $0.012 at the time.

That is the scale of capital pointed at Brazilian tungsten. A micro-cap doing first-pass surface work, while Washington weighs $1.6 billion for Kazakhstan. The gap is not only upstream. The Cove Kaz feasibility scope in Kazakhstan is being written to include APT refining inside the country [Tantalum Strategy, June 13, 2026]. The desk is not aware of a comparable Brazilian downstream tungsten commitment. Brazil’s R$15 billion Sovereign Brazil Plan credit line, presented by BNDES to IBRAM in May 2026, was built to finance exactly this kind of mine and processing capital [Tantalum Strategy, June 13, 2026]. On the desk’s reading it has not reached tungsten.

What it means

This desk has written American tungsten as a resource-absence problem: no domestic mine since 2015, so buy scrap, buy Kazakh ore, buy Japanese gas. Railroad Valley suggests the absence was not geological. It was a decade of not looking, plus a land order that has not been reopened even as the price rose 600 percent.

It also sets a precedent. Federal withdrawals for scientific, military and conservation purposes are common across the American West, and PLO 7921 runs to 2043. If critical minerals policy begins overriding them, the tungsten case is the template. If it does not, a FAST-41 designation is branding.

For the index read, none of this moves TAI-M. Tungsten is not a TAI-M constituent and Railroad Valley produces nothing for five years. The SOV50 read is unchanged.

What to watch

Whether 3PL publishes a resource statement under SK-1300 or NI 43-101 with a qualified person sign-off. The August 3 release is a company report from a private issuer with no disclosed technical standard. Until that changes, 1.78 million tons is a claim, not a resource.
Any move to revoke or modify PLO 7921 ahead of its 2043 expiry, whether through appropriations language or a NASA statement identifying an alternative calibration site.
Whether the Kazakhstan financing closes and the Cove Kaz definitive feasibility study, expected to begin in the second half of 2026, confirms in-country APT refining. A US commitment abroad while a domestic deposit sits withdrawn is the clearest signal on how Washington ranks its own agencies.