Raw Materials
Rocks, gases, water. The cyclical commodity exposure at the bottom of the stack.
What this layer does
Every layer above eventually decomposes into commodities: copper in the transformer windings and DC busbars, aluminum and steel in the building, rare earths in motors and magnets, silica sand in the wafer, gold in chip bonding, helium for fab cryo, and ungodly amounts of water for cooling. Most of these markets are dominated by old, cyclical resource companies whose stocks rarely correlate with semis on a daily basis — but on a multi-year basis, the AI capex cycle is a real demand driver, especially for copper, electrical-grade aluminum, and uranium (already covered in Layer 16).
This is the layer for the patient investor. The signal-to-noise is low on a quarterly basis. The dollar opportunity is large on a decade basis.
Sub-categories
The single most important AI metal. Each new GW of data-center capacity consumes thousands of tonnes of copper in wire, busbars, transformers, motors. Goldman/BloombergNEF model multi-million-tonne incremental demand by 2030.
Lighter conductor, used heavily in transmission and DC structural elements. Energy-intensive to smelt — double-exposed to electricity prices.
DC construction, rebar, structural — plus transformer-grade electrical steel (GOES) which has its own tight supply story.
Magnets for motors and generators; some used in semiconductor processing.
High-purity quartz is the starting material for polysilicon and ultimately wafers. Surprisingly concentrated supply (Spruce Pine, NC).
Required for MRI-class fab cryogenics and inert handling. Supply concentrated in a few US, Qatari, and Russian sources.
Bonding wires, sputtering targets, plating. Small per-chip; large in aggregate.
Compound semiconductor inputs — GaN, SiC, RF, optoelectronics. Mostly Chinese supply; subject to export controls.
A hyperscale data center evaporates millions of gallons per day in evap-cooled designs. Mostly a utility-level issue, but a few public proxies.