ATERRA Metals Inc. (CSE: ATC; OTCQB: CSSCF) reported 159.8 million tonnes at Totora on September 24. On November 10 it reported 150.1 million. The block model underneath both numbers is the same one.
What changed was the filter. Alongside the filing of its NI 43-101 technical report, the Canadian disclosure standard that governs how mining companies report mineral resources, ATERRA disclosed that independent consultant SRK had tightened the constraints used to decide which blocks of rock have a reasonable prospect of ever being mined. Some deep, isolated material fell out. Average grade edged up.
ATERRA Files Totora NI 43-101 Report Backing a 150.1 Mt Resource
The updated estimate carries an effective date of October 27, 2026, and the technical report is dated November 6. It puts the project in Chile’s Region III at 150.1 million tonnes grading 0.305% copper and 0.159 grams per tonne gold, or 0.517% copper equivalent, at a 0.20% copper cut-off grade. Contained metal comes to 1,009.0 million pounds of copper and 768.7 thousand ounces of gold. Copper equivalent (CuEq) folds the gold into a single copper-denominated grade at assumed prices; the cut-off is the minimum grade a block must carry to be counted.
Every tonne sits in the Inferred category, the lowest of the three confidence levels under Canadian rules. ATERRA’s own releases state that Inferred resources carry a high degree of uncertainty and that there is no assurance any part will be upgraded to a higher category or to a reserve.
Frontera carries most of the weight. It holds 79.9 million tonnes at 0.591% CuEq, about 61% of the contained copper equivalent. Totora-Algarrobilla adds 54.3 million tonnes at a lower 0.406% CuEq, and Clinton contributes 15.8 million tonnes at 0.525% CuEq.
Open-pit shells, the outer limits of a theoretical pit, hold 124.3 million tonnes at 0.52% CuEq. The remaining 25.8 million tonnes fall inside underground shapes modeled on bulk caving, at 0.49% CuEq.
Why the Totora Resource Shrank 6.1% While Grade Rose
Measured against the September 24 maiden estimate, tonnage is down 6.1% from 159.8 million tonnes. Contained copper equivalent fell 4.5%, to 1,710.5 million pounds from 1,790.8 million. Copper alone dropped 5.5%, gold 3.0%.
Grade went the other way, from 0.508% CuEq to 0.517%.
According to the release, the block model, the three-dimensional grid of grade estimates the resource is built from, did not change. SRK refined its conceptual extraction constraints instead, meaning the notional pit and underground shapes used to test whether material could plausibly be mined. Most of the lost tonnage came out of Totora-Algarrobilla, where isolated deep blocks no longer fit once those shapes were applied.
The 159.8 million tonne figure did not stay on paper. ATERRA cited it in its October 5 release upsizing the financing that closed ten days later.
Totora Pit Shells Assume US$6.00 Copper; No Metallurgical Testing Yet
The pits were optimized in Whittle software at US$6.00 per pound copper and US$3,650 per ounce gold, with 85% recovery for both metals (75% for copper in oxide leach material), a 45-degree slope and processing costs of US$11.30 per tonne. The CuEq grade is calculated on a lower US$4.00 copper price, with molybdenum and silver excluded. The estimate runs on two copper prices at once.
Metallurgy is the bigger gap. The release states that no metallurgical testing has been completed on the mineral resources; historical work covered two composite samples that SRK has not verified. That makes the 85% recovery figure an assumption rather than a test result.
The choice of cut-off moves the picture a long way. At 0.15% copper the same model reports 250.0 million tonnes at 0.432% CuEq, and at 0.30% it reports 69.5 million tonnes at 0.644%. ATERRA presents those only as sensitivity cases, with the 0.20% base case the only figure reported as a mineral resource.
SRK geologists Joled Nur and Sophia Bascuñán are the independent qualified persons for the estimate and the data verification. The remaining technical content was approved by Chief Geologist Francisco Bravo, who, the release notes, is not independent of the company.
ATERRA Funded Totora Phase II With a C$8.355M Raise at C$0.06
The money for the next round is already in. ATERRA closed a C$8,355,000 offering on October 15 at C$0.06 per common share, using the listed issuer financing exemption (LIFE), a Canadian route that lets listed companies sell shares that are free-trading on issue.
It grew along the way. As first announced on September 29, the offering targeted C$4 million to C$6 million. The closing release does not give a share count; at C$0.06, the gross proceeds imply roughly 139.25 million new shares. Agents led by Research Capital Corporation received C$410,167.90 in cash fees and 6,669,465 broker warrants, each exercisable at C$0.06 for two years.
Neither the November 10 release nor the closing release states a cash balance or a runway estimate.
ATERRA Holds Totora Under Option Agreements, Not Outright
ATERRA does not own Totora yet. It holds the properties under option agreements that require future payments and, in some cases, exploration spending, and the November 10 release warns that missing a requirement could cost the company some or all of its interest.
The current release does not restate the terms. The company’s February 3, 2026 announcement of the signed agreements points readers to a November 20, 2025 release, issued when the company was still Cascada Silver Corp. and the deals were non-binding memorandums of understanding (MOUs). That release described US$10,000,000 in Frontera option payments over seven years, heavily back-end loaded: US$5,450,000 falls due on the seventh anniversary, with no royalty. The Clinton MOU called for US$4,000,000 over four years and a 1.5% net smelter return (NSR) royalty, a share of revenue after smelting and refining costs, retained by the vendor. Taruca, which hosts the Totora porphyry, sits under its own agreement.
The February release also noted that Frontera’s exploitation concessions cover 11 hectares and that the mineralized porphyry extends onto ground held by Compañía Minera del Pacífico, a subsidiary of CAP S.A. (Santiago Stock Exchange: CAP). The November 10 release does not say how much, if any, of the Frontera resource lies on that adjacent ground.
ATERRA’s 13,000-Meter Totora Phase II Drilling Is Slated for November 2026
CEO Carl Hansen told investors the company intends to start the 13,000-meter Phase II program this month. “Our next step is Phase II,” he wrote. Planned holes target extensions of Frontera, including its higher-grade copper-gold core, and extensions of the Totora system. Infill drilling at all deposits is meant to raise confidence in the Inferred classification, and the program will also collect the first samples for metallurgical testing.
A magnetotelluric survey, which maps electrical conductivity deep underground to help outline possible extensions of known deposits, is under contract with completion targeted for November 2026. The company cautions that the survey may be inconclusive. No date has been given for a further resource update.
Sources
- Newsfile: ATERRA Updates Totora Inferred Mineral Resource and Files NI 43-101 Technical Report, November 10, 2026
- Newsfile: ATERRA Metals Announces Closing of $8,355,000 Brokered LIFE Offering, October 15, 2026
- Newsfile: ATERRA Metals Announces Upsize of Brokered Life Offering to $8,355,000, October 5, 2026
- Newsfile: ATERRA Metals Announces Brokered Life Offering for up to $6 Million, September 29, 2026
- Newsfile: ATERRA Metals Reports Maiden Totora Cu-Au Project Inferred Mineral Resource of 159.8 Mt Grading 0.51% CuEq, September 24, 2026
- Newsfile: ATERRA Finalizes Option Agreements for the Totora Copper-Gold Porphyry Properties, Region III, Chile, February 3, 2026
- Newsfile: Cascada Silver Corp. release announcing non-binding MOUs for the Frontera, Clinton and Taruca properties, November 20, 2025
Editorial Disclosure
This article is based entirely on publicly available information. Company data was verified against ATERRA’s original releases distributed by Newsfile and dated November 10, October 15, October 5, September 29, September 24 and February 3, 2026, and November 20, 2025. The only security covered is ATERRA Metals Inc. (CSE: ATC; OTCQB: CSSCF), formerly Cascada Silver Corp. CAP S.A. (Santiago Stock Exchange: CAP) is named only as the parent of an adjacent concession holder and is not covered. SRK, Research Capital Corporation and Compañía Minera del Pacífico are referenced as named in the releases; SRK and Research Capital Corporation are private firms with no security for readers to act on. ATERRA trades on the CSE with a U.S. line on the OTCQB, which is DTC eligible; U.S. investors should confirm availability with their broker. aktiego.com has not received any compensation from ATERRA, its management, investor relations representatives, or any third party. No staff member or principal of aktiego.com holds a position in any security named here at the time of publication.
The Totora estimate is reported as NI 43-101 compliant per the November 10, 2026 release: 150.1 million tonnes grading 0.305% Cu, 0.159 g/t Au and 0.517% CuEq at a 0.20% Cu cut-off, classified entirely as Inferred, with a resource effective date of October 27, 2026 and a technical report dated November 6, 2026. Inferred resources carry a high degree of uncertainty, are not mineral reserves and have no demonstrated economic viability. No economic study has been published on this estimate. No metallurgical testing has been completed on the resource, so the 85% recovery assumption is untested. Pit shells use US$6.00/lb copper while CuEq grades use US$4.00/lb copper; CuEq figures are company calculations and are not directly comparable to equivalents calculated on other price decks.
The November 10 estimate supersedes the September 24, 2026 maiden estimate of 159.8 million tonnes, which the company cited in its October 5, 2026 financing release. Of the three qualified persons named, Joled Nur and Sophia Bascuñán of SRK are stated to be independent; Francisco Bravo, ATERRA’s Chief Geologist, is stated not to be independent of the company.
ATERRA closed a C$8,355,000 LIFE offering on October 15, 2026 at C$0.06 per share, which implies about 139.25 million new shares (the closing release does not state the count), plus 6,669,465 broker warrants exercisable at C$0.06 for two years and C$410,167.90 in cash fees. Further dilution is possible from warrant exercise and future raises. No specific cash balance or cash runway was identified in the sources reviewed, and no going-concern statement appeared in them; readers should consult the company’s financial statements on SEDAR+.
ATERRA holds its Totora interests under option agreements and does not own the properties outright. Failure to make required payments or meet exploration commitments could result in loss of some or all of its interest. The payment terms cited here come from the November 20, 2025 announcement of non-binding MOUs; the November 10, 2026 release does not restate the terms of the executed agreements. The mineralized Frontera porphyry extends onto adjacent concessions held by a third party, and the releases reviewed do not state how much, if any, of the resource lies there.
Statements about the Phase II drill program, its November 2026 start and the magnetotelluric survey are based on the company’s own forward-looking disclosures. Timing and results are not guaranteed, and the company states the survey may be inconclusive.
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