Endeavour Silver's Costly Boom: Riding High Silver Prices While Ramping Terronera

Endeavour Silver's second quarter was a study in the double-edged sword of a bull market in silver. On one hand, the company delivered record metal sales and a 150% revenue jump, with mine operating cash flow tripling year-over-year. On the other, the very price that is fueling this growth is also inflating costs across the board. The company's all-in sustaining cost rose 47% to $37 per ounce, as higher royalties, purchased material, profit sharing, and mining taxes all became more expensive with silver's rally. CEO Dan Dickson framed it plainly: “Profitability has significantly increased our operating costs with increased royalties, purchased material, profit sharing and mining taxes.” — Dan Dickson, CEO · 2026-07-30 The appreciating Mexican peso added further pressure, pushing direct operating costs per tonne up 14%.

Nowhere is this cost dynamic more pronounced than at Guanacevi, where purchased ore has become a bigger piece of the mix. Higher high prices have allowed the company to mine lower-grade zones, extending mine life but raising unit costs. In the quarter, purchased ore accounted for roughly 21% of throughput, and management expects this to continue as long as prices stay elevated. The trade-off is intentional: the margin on purchased ore is healthy, and it keeps the aging plant fed. But it does distort the unit-cost picture, as Dickson noted in the Q&A: “The higher metal prices also drove higher royalties, special mining duty payable for the period.” — Dan Dickson, CEO · 2026-07-30

We haven't changed our guidance on that all-in sustaining cost. And clearly, where we are sitting is much higher than our guidance, and that's going to continue because of the higher prices.

Operations: Ramping Terronera, Expanding Kolpa

At Terronera, the focus remains on the ramp-up. Silver grades were in line with plan and are set to increase in the second half as mining accesses higher grade areas. Dickson reiterated the timeline: “Ultimately, that high-grade gold isn't in our plan for 2026. It's in our plan for 2027.” — Dan Dickson, CEO · 2026-07-30 The company is intentionally drawing on lower-grade material early in the ramp to optimize recoveries and avoid sending metal to the tailings dam. The beneficial step-up in silver grade is expected to be incremental through Q3 and Q4, with the real punch coming in 2027.

Kolpa has been a pleasant surprise on the throughput front, with the new crusher and ball mill pushing capacity to 2,500 tonnes per day. However, the expansion has also brought a slew of capital improvements, including a new water treatment plant, power substations, and a conversion to dry stack tailings. Management added $18 million to the 2026 budget to bring these projects forward, a move Dickson says is essential for the long-term viability of the asset: “We're going to be there 15, 20, 25 years, and we're going to make these investments now.” — Dan Dickson, CEO · 2026-07-30 These expenditures—while not entirely unexpected—are a sink for cash in the short term, but they position Kolpa as a sustainable, longer-life operation.

Capital Allocation: Cash Hoard and Pitarrilla

Endeavour's balance sheet is in its strongest position in years, with $236 million in cash and working capital of $214 million. Management is accumulating these reserves for a clear purpose: the construction of Pitarrilla, projected to cost $500–600 million. The feasibility study is due at the end of Q3, and management is sticking to that timeline despite a slower spend: “We are still targeting Q3 of 2026. Maybe it ends up being more of the back half of Q3 rather than the front half of Q3.” — Dan Dickson, CEO · 2026-05-07 This echoes the sentiment from the Q1 call, where Dickson said: “We don't expect Q1 to be as elevated as it was in Q4... we do expect that cost to decrease over the year.” — Dan Dickson, President and CEO · 2026-02-27 The cash will be earmarked for Pitarrilla, delaying any shareholder returns until the project is up and running, as Dickson has repeatedly stated. The company's belief in its own stock is evident, but management remains disciplined on capital allocation, preferring to fund growth rather than return cash prematurely.

In summary, Endeavour Silver is executing well operationally, but the cost inflation driven by higher metals prices is a persistent headwind that will likely keep AISC elevated in the near term. The company's strategic focus on Pitarrilla suggests that investors should expect a multiyear investment phase before meaningful shareholder returns. For now, the story is one of growth through cost pressure—a trade-off management seems willing to make.