Silver and Lead in GB Polymetallic Systems: The Byproduct Math Nobody's Doing Yet

A galena sample from one of our Astore concessions came back at 312 g/t Ag last quarter. Not the headline number. The byproduct number.

That's the part most people miss when they look at Gilgit-Baltistan. Everyone wants to talk about the copper porphyries, the tungsten skarns, the lithium pegmatites. Fair enough — those are the strategic stories. But if you've spent any real time in the field up here, you know the polymetallic systems are quietly stacking silver and lead credits that can flip a marginal project into a bankable one.

Let me explain what we're actually seeing.

The geology, briefly

Gilgit-Baltistan sits on the collision zone between the Indian and Eurasian plates. The Kohistan-Ladakh island arc, the Karakoram batholith, the Main Mantle Thrust — all of it stacked into a few hundred kilometres. That collision cooked and remobilised metals in ways that produced classic polymetallic signatures. Cu-Pb-Zn-Ag with variable Au. Sometimes Sb and W in the same corridor.

The vein systems around Chilas, the skarn contacts near Skardu, the sulphide showings we've mapped in the Astore and Shigar valleys — these aren't clean single-metal deposits. They're messy. Which is exactly why the byproduct case matters.

Honestly, I used to think of silver and lead as nuisance metals — things to account for at the smelter, deductions on the assay sheet. That was a mistake. On several of our concessions, the Ag credit alone would carry the operating cost if we treated Cu or Zn as the primary.

What the numbers actually look like

I'll give you real ranges from our own sampling programmes, not marketing figures. Chip and channel samples across three concessions in the Astore-Skardu belt:

• Silver: 40 to 480 g/t in galena-rich zones. A handful of grab samples above 600 g/t but I don't count those until we've drilled them.
• Lead: 2.1% to 14.7% Pb in the sulphide-dominant sections. Galena is coarse and clean in most hand specimens — good news for flotation recovery.
• Zinc: 1.8% to 9.3% Zn where sphalerite is present. Not always co-located with the galena at high grade, which matters for circuit design.
• Copper: 0.4% to 3.2% Cu, mostly chalcopyrite, occasionally tetrahedrite (which is where a chunk of the silver actually lives).

The tetrahedrite point is important. When silver reports to tetrahedrite rather than argentiferous galena, your metallurgy gets more complicated and your smelter terms shift. We've seen both mineralogies within a single concession, sometimes within a single 200m strike length. So representative sampling isn't optional — it's the whole game.

For context, LME lead is sitting around $1,980/t as I write this, and silver's hovering near $31/oz. Run the math on 8% Pb and 200 g/t Ag over a reasonable mining width and you'll see why I keep pushing our team to close out the resource work on these before we chase the next copper anomaly.

Why byproduct credits change the JV conversation

Here's the thing. When an overseas buyer or JV partner looks at a Pakistani polymetallic project, the first questions are usually about primary metal grade and tonnage. Fine. But the second-order economics — the ones that actually determine whether a mine gets built — are almost always about byproducts.

A copper concentrate carrying 300 g/t Ag pays differently than one carrying 40 g/t. A lead concentrate with clean galena and low deleterious elements (we're seeing low As, low Sb in most of our Astore samples, which is unusual and useful) commands better smelter terms out of the Gulf and East Asia.

For anyone looking at silver Pakistan supply or lead zinc Pakistan concentrate off-take, GB is one of the few regions where you can realistically build a polymetallic story that isn't dependent on a single metal's price cycle. That's what makes these deposits interesting to Chinese smelters we've spoken to, and increasingly to a couple of Japanese trading houses doing quiet diligence on Pakistan concentrate flows.

What we still need to prove

I'm not going to pretend the resource work is finished. It isn't. What we have:

• Systematic surface sampling across 4 of our 16 concessions with polymetallic potential
• Trenching on two priority targets with continuous chip sampling
• Preliminary metallurgical testwork on a bulk sample from one Astore vein — recoveries of 89% Pb and 76% Ag in a lead concentrate at reasonable grind size

What we don't have yet:

• Drill-defined resources to JORC or NI 43-101 standard. That's the next 18 months if a JV partner comes in with drilling capital.
• Full variability testwork across the tetrahedrite-galena mineralogy
• Detailed hydrogeology on the higher-elevation targets (some of these sit above 3,800m and the winter window is short)

I mention all this because credibility with serious investors comes from being honest about what's proven and what's inferred. Anyone telling you they've got a fully-defined polymetallic resource in GB right now is either working on a very small deposit or telling you a story.

Where this goes

The concentrates from a properly developed GB polymetallic operation would move overland to Karachi — that logistics piece I've written about separately — and from there to smelters in China, Korea or the Gulf depending on term sheets. Lead concentrate off-takers we've been in early talks with are focused on the Ag payability terms and the arsenic/antimony penalties. Ours look clean on that front, which is a real commercial advantage and not something I would have predicted before we ran the assays.

If you're a smelter, trader or mining company evaluating polymetallic deposits with meaningful silver and lead credits, and you want to see the actual assay certificates rather than a pitch deck, get in touch. I'd rather have a technical conversation than a marketing one.

What are you actually paying for 250 g/t Ag in a clean lead concentrate this quarter?