Last week, we looked at why copper discovery costs have exploded. The conclusion was quite straightforward: the industry is spending more money to discover less copper.
But discovery is only one piece of the puzzle.
Sure, the piece that, as investors we chase for outsized returns, yet still a piece.
A separate question has been nagging at me during this research series:
If large discoveries are becoming rarer, where does that stress eventually show up?
One answer may be sitting in plain sight.
Warehouse inventories.
Think about it this way:
A market can live with lower inventories.
A market can live with declining discovery rates.
A market can live with lower grades.
A market can live with longer permitting timelines.
What becomes much harder is living with all four at the same time.
The issue isn’t any single source of stress. It’s the gradual erosion of the system’s safety margin.
A system with abundant inventories can absorb disruptions with ease. That is not the world we’re in, and opportunities are bound to be created here.
In this note, I explore how shrinking inventories may be one of the clearest signs for long-term copper investors. This is part 4 of my Supply stress series.
PS: All research notes are available immediately on Substack and a day or so later on the Mining Investing Toolkit.
Copper prices vs. LME stocks. 1994-2026.
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