$68M for a Broken Mine. Now It’s a Copper Giant | Firefly Metals Green Bay PEA
Summary
Firefly's Green Bay PEA values the A$68M mine at A$2.2B — a 32x paper markup built on hydro power, brownfield infrastructure, and top-decile copper grades.
Base case: 50,000 tonnes copper-equivalent yearly for 14 years; C1 cash costs (a mine's site-level operating cost) hit US$2.05/lb thanks to hydropower.
The 32-year mine plan frontloads 77% measured-and-indicated ore, but 20% still sits in inferred — a real long-life mining risk if drilling disappoints.
Sustaining capital adds A$876M to Firefly's A$513M initial capex, lifting life-of-mine capital to A$1.4B — almost double the headline figure.
Compared to peers, Firefly screens mid-pack: cheaper than New Found Gold on EV/NAV (enterprise value to project net asset value), pricier than Falco Resources.
Key points on Falco Resources
- Used as the cautionary comparable: Horne 5 at Rouyn-Miranda has a June feasibility with a $3.4B after-tax NPV, but an EV of just $210M (0.06x NAV) while it waits on a Quebec ministerial decree.
- Needs ~$1.8B of construction capital against a C$180M market cap — the host argues a large NPV is worthless without a credible funding path.
Key points on New Found Gold
- Neighbouring comparable: EV near $840M against ~$940M of NAV from Queensway and Hammerdown — about 0.9x NAV — initially screens cheaper than Firefly on a like-for-like multiple.
- Caveat: the PEA was run at $2,500/oz gold (46% below spot); flexing to the company's own $3,300/oz sensitivity drops the multiple to 0.5x, making it cheaper than Firefly.
Steve Hyland's takeaways
- Top takeaway Calls the Firefly PEA a good study 'on balance' specifically because the reasons are boring — ~$250M of brownfield infrastructure already in place, cheap hydropower, a port 6km away, conventional long-hole stoping and flotation, top-decile copper grade, a price deck 25–30% below spot, and the company funded through feasibility without needing anyone's permission.
- Frames Firefly as 'mid-pack' on EV/NAV at ~0.6x base case (0.4x alternative) — more compelling than New Found Gold once New Found's PEA is flexed to its own $3,300/oz gold sensitivity, and much further along than Osisko Metals' unstudied Gaspé Copper — but not as optically cheap as Falco Resources, the cautionary tale whose funding path he judges non-credible.
- Flags the real PEA-stage risks the market should not overlook: 20% of the resource is still inferred, a maiden reserve won't exist until next quarter at the earliest, sustaining capex of A$876M is nearly double the A$513M upfront bill, and construction money still has to be raised despite the A$190M raise and indicated US$350M+ of debt capacity.
- Argues the base-case vs alternative-case framing is a trade-off, not a free option — a higher NPV via 4.6Mt/y throughput requires sinking a ~1,400m, 7.6m-diameter shaft and stretches payback to 3.7 years, whereas the base case keeps costs down upfront by trucking up a bypass decline and running a generational 32-year asset.