Antimony, Tungsten and Copper in Gilgit-Baltistan: What the Geology Actually Tells Us

Sb prices crossed USD 39,000/t in late 2024 and most of the buyers I speak to still can't name three antimony-producing countries outside China. That's the supply problem in one sentence.

I run GBX Resources. We hold 16 concessions across Gilgit-Baltistan, and a meaningful slice of that portfolio sits squarely on the critical-minerals list every defence and EV buyer in Brussels, Tokyo and Washington is now trying to de-risk. Antimony. Tungsten. Copper. Plus the molybdenum, gold and rare-earth-bearing pegmatites that come with the same geological address.

This post is for the people actually writing cheques or signing off-take. Not a brochure.

The geological setting (and why it matters for grades)

Gilgit-Baltistan sits at the collision zone of the Indian and Eurasian plates. You've got three things stacked on top of each other — the Kohistan-Ladakh Island Arc, the Karakoram Block, and the northern edge of the Indian plate — separated by the Main Karakoram Thrust and the Main Mantle Thrust. Honestly, for a mineral explorer it's one of the more interesting addresses on earth. Island-arc volcanics give you porphyry copper and skarn tungsten. The Karakoram batholith gives you granite-related W-Mo-Sn systems. And the suture zones throw off antimony-gold mineralisation along the structural breaks.

That's not theory. It's what the rock chips and trench samples keep confirming.

Our antimony work is concentrated in the Chillas–Astore corridor and parts of Skardu district, where stibnite veins run along brittle shear zones cutting metasediments. Grab samples on two of our concessions have returned 38% to 54% Sb on visible stibnite, with channel samples across the vein structures averaging in the 8–14% Sb range. For context — China's average mined grade is now under 2.5% Sb and falling. Tajikistan's big operation runs around 1%. The grades coming out of GB are not normal.

Tungsten is a different story. We're working scheelite-bearing skarns on the contact between Karakoram granitoids and Palaeozoic carbonates. Early sampling on one block returned WO3 values between 0.4% and 1.8%, with scheelite confirmed under UV. That's drill-ready ground. We haven't drilled it yet — and I'll be straight, that's exactly the kind of work a JV partner with a proper exploration budget should be funding, not us bootstrapping it.

Copper sits in two settings. Porphyry-style mineralisation in the Kohistan arc (low grade, big tonnage potential — the kind of thing only a major can build) and higher-grade vein and replacement copper in the 1.2% to 3.8% Cu range across smaller structures we can actually mine in the near term.

What a serious off-take or JV actually looks like from here

Look, I get a lot of inbound. Most of it isn't serious. So let me be clear about what works.

Off-take on antimony concentrate. We can move to small-scale production fastest on Sb. The metallurgy is straightforward — gravity plus flotation gets you to a 58–62% Sb concentrate that smelters in China, Türkiye and increasingly Europe will take. A buyer pre-paying against tonnage, or financing the plant against a multi-year offtake, is the cleanest structure. We've had two such conversations advance to term-sheet stage in 2024.

JV on tungsten. Scheelite skarns need drilling, a proper resource estimate to JORC or NI 43-101 standard, and pilot metallurgy. That's an 18–30 month programme and somewhere between USD 4M and USD 9M depending on how aggressive you want to be on the drill metres. We carry the licence, ground knowledge, government relationships and local workforce. Partner brings capital and technical bench. Standard earn-in structures work — 51% to 70% on defined spend, with us free-carried to production decision.

Copper — depends entirely on which deposit. The vein systems we can put into production within 24 months on modest capex. The porphyry ground is a 10-year story and frankly belongs in the hands of a Freeport, Zijin or Barrick-type operator. I'd rather hand it to people who actually build those mines than pretend we can.

Licensing, logistics, and the things nobody asks about until month six

Mineral rights in Gilgit-Baltistan are administered under the GB Mines and Minerals Act. Exploration licences and mining leases are issued by the GB government — not Islamabad — which is actually a cleaner process than people expect once you understand the local channels. All 16 of our concessions are held under valid title. Royalty regime is published. Export of concentrate and ore is permitted under SRO frameworks; we've moved jade and granite internationally already, so the export muscle exists.

Logistics is the honest constraint. The Karakoram Highway runs from our ground down to Hasan Abdal and onwards to Karachi port (roughly 1,600 km from Skardu to the port). Khunjerab gives us a direct land route into Xinjiang, which matters for Chinese off-takers who'd rather not touch sea freight. Winter closures on the KKH between December and March are real and need to be planned around. Anyone telling you GB logistics is easy is lying. Anyone telling you it's impossible hasn't tried.

The other thing — and I got this wrong in my first two years — is that you can't run this from a Karachi or Islamabad office. The relationships, the security clearances for foreign technical teams, the local labour, the access agreements with valley communities. All of it is on-the-ground work in Gilgit, Skardu and Chilas.

If you're a buyer or a mining house looking at Pakistan critical minerals seriously, the question isn't whether the geology is there. It is. The question is whether you want to be in early — at concession-holder terms — or pay three times more in five years when the majors have finally figured out the address.

What's the timeline on your side?