Just realized a lot of people jumping into junior mining stocks don't actually understand what companies are telling them about what's in the ground. The whole reserve vs resource thing? Yeah, that's actually crucial and people get it wrong all the time.

So here's the deal. When mining companies report what they've got, they're basically using two different frameworks. Mineral resources are what exists in the deposit, period. Mineral reserves are the part that actually makes economic sense to dig up. Big difference.

Let me break down the resource side first because that's where exploration starts. You've got three levels here based on how much work they've actually done.

Inferred resources are the earliest stage. Company did some surface sampling, maybe a few drill holes, and they think there's something there worth looking at. But that's it. The confidence level is low and honestly, this is where you need to be careful as an investor. Yeah the numbers might look good, but they haven't done the work yet. This is high risk territory. These can't even be used in feasibility studies under NI 43-101 rules.

Once they've drilled more and actually understand the deposit better, that becomes an indicated resource. Now they know the shape, the depth, how far it extends. They've got a better read on the grade and what minerals are actually there. This starts to matter more because it can go into prefeasibility studies. You can actually start thinking about whether this could turn into a real mine.

Measured resources are where the real data lives. This is the detailed stuff they use for late-stage reports and feasibility studies. When a company shows you measured resource numbers, that's their serious estimate of what's actually economically viable to extract.

Now here's where reserve vs resource gets interesting. A reserve is basically the part of a resource that makes financial sense. They exclude areas that are too far away, too expensive to reach, or too low grade to be profitable. It's the realistic number.

Probable reserves come from indicated resources and they factor in real-world stuff like extraction rates, processing tech, environmental costs. They're showing you what could realistically be mined and sold.

Proven reserves? That's the highest confidence level. It's based on measured resources with all the economic and engineering factors built in. This is what a company is actually planning to mine. When you see proven reserves, that's their final number.

The thing most investors miss is that these categories tell you different things about risk and timeline. Early stage exploration with inferred resources? Could be massive or could be nothing. Proven reserves? That's real. That's what's happening.

If you're evaluating junior mining plays, understanding this reserve vs resource breakdown is literally the foundation of your due diligence. Don't skip it.