Hot Chili has a cult following on the influential HotCopper forum. But how real is the hype?
For junior mining companies, the ASX is a double-edged sword. The exchange hosts a deep retail investor base with strong appetite for mining stories, but Australian analysts are famous for asking tough questions.
That matters for Hot Chili, the copper junior and HotCopper cult stock, because it has surged 238% and been added to the All Ordinaries over the past year in a copper-hungry market.
Hot Chili in hot Chile
Hot Chili began life as an IOCGU (iron oxide, copper-gold-uranium) explorer before pivoting into copper-gold in Chile. Over more than a decade it consolidated four deposits within a 30-kilometre radius into what it now calls Costa Fuego, containing 2.91 million tonnes of contained copper and 2.64 million ounces of gold. In 2021, Glencore acquired 9.9% of the company, secured a board seat, and signed an eight-year offtake agreement covering 60% of future concentrate production.
The March 2025 pre-feasibility study (PFS) is central to the bull case. It outlined a 20-year mine life producing 90,000–116,000 tonnes of copper equivalent annually, with a post-tax NPV of US$1.2 billion and a 19% post-tax IRR at an 8% discount rate.
Costa Fuego’s coastal location has advantages compared with copper mines in the mountains. Just 60 kilometres from port and only 740 metres above sea level, the project can use seawater directly rather than relying on costly high-altitude pumping systems common in the Andes, where most of the worlds large copper-gold porphyry projects are located. The study estimated life-of-mine C1 cash costs at US$1.38 per pound and an all-in sustaining cost of US$1.85 per pound after gold and molybdenum by-product credits. That places the project in the second quartile of the global cost curve - competitive, though not elite.
Head grades and torque
The grade question deserves attention because 0.44% copper equivalent is not high grade. These are large-scale, low-grade porphyry deposits not uncommon in the copper industry. But it means Costa Fuego’s economics depend entirely on low strip ratios, and the ability to process huge volumes cheaply, much like 68% of global copper supply. Costa Fuego appears to clear that hurdle, with a 502-million-tonne probable reserve underpinning the development case. But there is no geological magic here: this is a volume business, heavily exposed to copper prices.
That copper leverage is both the attraction and the risk. The PFS used a long-term copper price of US$4.30 per pound and a long-term gold price of US$2,280 per ounce and generated a US$1.2 billion post-tax NPV. At current spot copper prices near US$6.30, management estimates the post-tax NPV rises to roughly US$3.2 billion and the post-tax IRR approaches 33%. Every 10-cent move in copper materially changes project economics.
A sustained retreat to US$3.50 copper would likely compress the valuation significantly and make financing more difficult. Costa Fuego is fundamentally a bull-market copper asset.
La Verde and excitement
The other major catalyst is La Verde, a shallow porphyry copper-gold discovery secured in late 2024 around 30 kilometres south of the Costa Fuego hub. Early drilling has outlined a sizeable system. Importantly, numerous shallow higher-grade drill intercepts, have confirmed potential for a high-grade starter pit at La Verde
The company plans to incorporate La Verde into a revised PFS by the end of 2026. The strategic logic: if La Verde can provide higher-grade starter ore early in the mine schedule, it could improve cash flow, shorten payback periods, and materially enhance project economics. But again, it’s still early days.
Another asset is Huasco Water. Hot Chili holds the only granted maritime concession in the Huasco Valley, giving it the right to extract and supply seawater in a region facing water shortages. Several other undeveloped copper projects in the district will also require water infrastructure.
That concession could become strategically valuable. Chilean permitting timelines for new maritime concessions are lengthy, and the government has signalled support for centralised infrastructure rather than duplicate systems. If the water business were monetised separately, it could potentially offset a meaningful portion of Costa Fuego’s development capital.
The risks and excitement are both real
Still, the financing challenge remains substantial. Hot Chili needs about US$1.27 billion, on its own estimates to start production at Costa Fuego – and overruns are the norm not the exception.
Execution risks are real. The Cortadera block cave component is technically demanding. La Verde, while promising, is still early-stage exploration and being asked to support a meaningful portion of the valuation before any formal resource estimate exists.
The copper story is starting to lift off. Copper prices have been rising for decades as supply fails to adequately respond to demand – and the market is only just starting to wake up. Costa Fuego is targeting production around 2030, a period when many analysts expect the copper market to be tight. Copper projects are becoming more valuable, and the valuations of publicly traded copper miners are rising. Adding to this, only five +100ktpa CuEq copper developers remain outside of the control of the majors.
So Hot Chili is not just HotCopper hype. Costa Fuego is a credible copper project with a genuine infrastructure advantage and backing from Glencore. After a 238% re-rating in a year, much of that optimism may already be reflected in the share price. But when compared with North American peer projects (chart above) Hot Chili still looks cheaper on the valuation metrics preferred by the mining industry.
The next leg higher likely requires either a transformative strategic transaction or drilling results at La Verde that materially improve the mine plan. Neither outcome is guaranteed. But at the current copper price, the numbers work.
For investors bullish on copper and comfortable with pre-construction development risk, Hot Chili remains one of the more interesting ASX-listed junior copper stories. But as always, know the risks.
Hot Chili is in the ETFS Global Pure Play Copper Miners ETF (CPPR)
At ETF Shares, we are tracking copper with great interest, and Hot Chili is included in our ETFS Global Pure Play Copper Miners ETF.
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