Fortitude Mining has expanded its credit facility with parent company Digital Currency Group from $26 million to $50 million, adding capital for proof-of-work mining machines, data-center acquisitions, greenfield construction and infrastructure expansion.

The September 23 amendment leaves Fortitude with approximately $31 million of remaining borrowing capacity. The company expects that capacity to be funded primarily in Zcash, or ZEC, which it intends to sell for U.S. dollars to finance mining expansion. Fortitude says approximately $7 million remaining under the original commitment is expected to help fund payments associated with its previously announced 9,000-machine Zcash mining order.

9,000 Z15 Pro ASICs Expand the Fleet

Fortitude announced in July that it had executed a definitive agreement with Bitmain for 9,000 Antminer Z15 Pro miners. The machines are purpose-built Equihash ASICs used for Zcash proof-of-work mining.

Fortitude said each Z15 Pro is expected to provide approximately 840 KSol/s. Across 9,000 machines, the order represents roughly 7.56 GSol/s of nameplate Equihash capacity. The delivery schedule calls for 3,000 units in October and another 6,000 in November 2026.

The deployment is notable for BitcoinVersus.Tech because it represents a large institutional ASIC expansion outside the dominant SHA-256 Bitcoin mining market. Specialized mining hardware remains dependent on many of the same data-center fundamentals: reliable electrical distribution, transformer and switchgear capacity, network availability, cooling, preventive maintenance and rapid machine repair.

Power Infrastructure Matters as Much as Nameplate Hashrate

Fortitude operates an owned-and-operated power portfolio exceeding 60 MW across U.S. facilities. During the summer it energized a 12 MW site in Grand Island, Nebraska, and completed the acquisition of a 12.5 MW facility in Prosser, Nebraska.

Installing thousands of ASICs is therefore not simply a procurement exercise. The electrical path from utility service through transformers, switchgear, protection and branch distribution has to support the fleet continuously. Operators must also control intake temperature and exhaust recirculation, monitor rejected shares and network stability, and distinguish machine nameplate performance from accepted pool hashrate.

The expanded credit facility gives Fortitude additional flexibility to acquire both machines and the physical infrastructure needed to operate them. DCG also has the option to provide future advances in ZEC rather than cash. Those loans remain denominated and repayable in U.S. dollars based on the value of ZEC when transferred, according to the company.

Fortitude is also pursuing a proposed business combination with Nasdaq-listed HeartSciences. If completed, the combined company is expected to operate as Fortitude Mining Group and trade under the proposed ticker TUDE. The transaction remains proposed rather than completed.

What to Watch

The important operational milestones will come when the Z15 Pro fleet arrives and is energized. Useful measurements will include deployed machine count, sustained accepted Equihash rate, total wall power, uptime, cooling performance and the amount of new electrical capacity required to support the fleet. Those figures will show how closely the real deployment approaches its approximately 7.56 GSol/s theoretical nameplate capacity.

Sources

• Fortitude Mining: September 23, 2026 credit facility announcement and July 30, 2026 Z15 Pro purchase announcement
• U.S. Securities and Exchange Commission: HeartSciences/Fortitude transaction filing

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