Our Core Processing Facility is used to receive, log, photograph, sample and store our rock samples. It serves as a geological library, allowing our team of geologists to analyze rock characteristics, determine mineralogy, and plan future operations.

• On average, we process 682.5 feet of rock daily
• Since November 2020 we have logged 852,356.8 feet of samples
• Since November 2020 we analyzed 794,822.1 feet of samples

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Centro is our remote operations center in Nogales, designed to support safer, more sustainable mining in the local community. Key features include:

• Modern, office-style facility, designed to blend with Santa Cruz County’s landscape and architecture
• 24/7 operating facility, supporting ~200 full-time jobs across multiple shifts
• Advanced automation for safety and productivity
• Supports lower-emission, battery-electric equipment

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Our fully electric vehicle fleet will reduce emissions, lower noise and improve safety by:

• Operating on clean energy
• Using two on-site charging stations with six bays each, designed in a one-way “wishbone” layout to maximize safety and efficiency
• Allowing trucks and equipment to quickly swap battery packs and return to work
• Integrating advanced technology into operations from the start

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Ore is processed at an underground crushing facility:

• Large rocks are broken down before entering the primary crusher
• Dust is controlled using water sprays and collection systems
• Crushed ore is hoisted to the surface through the shaft, then transported on covered conveyor belts to the zinc processing plant for further treatment

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We are still exploring to better understand the full extent of Hermosa’s copper deposit. Recent exploration has shown:

• Existence of high-grade copper including: [ 143m @ 2.17% CuEq(a) (HDS-694) ] [ 162m @ 1.42% CuEq (HDS-689-A) ]
• Potential to access copper from the zinc mine shafts

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Hermosa’s zinc deposit has been the only major zinc discovery made in the past decade in the world. In fact, the equivalent of three Hermosa zinc-sized projects would need to be developed each year until 2034 to meet projected global demand. The deposit is projected to:

• Be home to one of the world’s largest undeveloped zinc deposits
• Also contain lead and silver
• Be located ~1,000-4,600 feet below the surface
• Have an initial mine life of 28 years

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Hermosa’s manganese deposit is:

• Located ~2,000 feet below the surface
• Zone A is similar in size to the White House
• Accessed from our private land
• Could produce enough battery-grade manganese [HPMSM] to supply domestic demand
• Based on a third-party assessment, is projected to be the lowest carbon impact project in manganese chemicals in North America

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WTP2 has operated since 2023 to support operations and:

• Treat underground water from depths of 4,000 ft
• Discharge treated water into Harshaw Creek, meeting or exceeding stringent state and federal health and safety standards
• Support actively recharge regional groundwater in key areas to reduce drawdown impacts
• Blend in with the natural environment by painting it the color of local flora and fauna we studied

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WTP1 has operated since 2018 to treat historic mine drainage and dry-stack tailings and stormwater. It was designed to:

• Meet or exceed stringent state and federal health and safety standards
• Capture and remove naturally-occurring groundwater elements that pre-date Hermosa, including selenium, lead and arsenic, to protect the environment and downstream users
• Discharge to Alum Gulch, which in part naturally recharges regional groundwater

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Our tailings filtration and paste plant manages waste efficiently while reducing surface storage:

• Five storage silos provide temporary tailings storage during monsoon season
• Tailings are filtered to ~12% moisture and recovered water is recycled back into operations
• ~45–50% of tailings are made into cement paste backfill and returned underground

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We've built one of the first new dry-stack tailings facilities in the U.S. to clean up legacy mine waste. To reduce our footprint and minimize storage risk, tailings are:

• Filtered to remove ~90% water, which is recycled into operations
• Compacted into into a dense, brick-like shapes
• Placed in our double-lined facility with integrated sensors that provide advanced monitoring long after mine closure

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The 3,000 feet deep and 25-feet wide Main Shaft:

• Provides fresh air
• Safely transports people, equipment, ore and waste rock
• Houses underground fuel, power and water lines

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The 2,700 feet deep and 25 feet wide Ventilation Shaft will:

• Allow for safe passage of people and vehicles underground
• Circulate used air to the surface
• Provide a secondary exit, hoist development rock

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The Administration building acts as the ‘brains’ of Hermosa, hosting all of our servers. The administration pad also hosts the Emergency Response Building.

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Our facility uses less energy, water, and chemicals. It features:

• Sealed transport: Ore in silos, covered conveyors, sealed containers
• Energy efficient: Flotation cells use ~30% less power, 40% less space
• Monitoring: Samplers and analyzers provide real-time metrics
• Responsible water management: ~90% of processed water is recovered and reused
• Tailings management: Dry-stacked or backfilled with ~90% water removed recycled in the processing plant

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We are constructing an 5,000-foot long decline underground to:

• Access the manganese deposit
• Enable further underground exploration
• Access bulk samples for better analysis and inform the planned demonstration plant

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