Summary

Mine Type	Underground
Status	Care and Maintenance
Commodities	Gold Silver
Mining Method	Cut & Fill Longhole stoping Longitudinal stoping Sub-level stoping
Backfill type	...
Production Start	...
Snapshot	The Midas Mine, part of Nevada Operations, is the largest known gold-silver epithermal deposit along the Northern Nevada Rift. It includes an underground mine, a Merrill Crowe processing facility, and support infrastructure. Midas mine was acquired by Hecla Mining in July 2018. Mine's production and financial results have been included into the Nevada Operations Segment since then. Production at the Midas mine was suspended in late 2019. As of December 2025, the mine remains on care and maintenance. At the Midas Project, a 2025 drilling program confirmed mineralized structures in five of six targets tested, including a gold discovery at the previously untested Pogo trend and at the Sinter Offset target. The project is supported by existing infrastructure that Hecla Mining plans to evaluate for refurbishment in connection with a potential restart of operations, subject to the results of ongoing technical and economic assessments.
Related Asset	Nevada Operation

Deposit type

• Vein / narrow vein
• Epithermal

Summary:

On a general scale, the hydrothermal system and subsequent mineralization developed at Midas is interpreted as a low sulfidation, epithermal precious-metal vein system, as part of a larger magmatic system at depth.

The Midas Mine is the largest known Au-Ag epithermal deposit along the Northern Nevada Rift (“NNR”) and is located, located in the mining district of Midas, also known as the Gold Circle district.

The Midas deposit consists of a series of complex steeply dipping, quartz-calcite-adularia precious metal veins hosted by volcanic and volcanoclastic rocks and locally contains mineral grades greater than (>) ten ounces per ton (opt) of gold. Gold mineralization occurs as electrum and is intimately associated with selenide and sulfide minerals. It belongs to a suite of middle Miocene low-sulfidation epithermal gold and silver mineralizing systems associated with magmatism and faulting along the NNR (Leavitt et al., 2004). The mineralization model at Midas is a shallow, low-sulfidation, vertically- and laterally-zoned, epithermal gold-silver system. Rocks in the Midas district are primarily ash flow, air-fall and lithic tuffs, felsic plugs, volcanoclastic sediments and gabbroic sills and dikes.

Gold and silver mineralization at Midas is hosted in several north-west striking veins. The veins are divided into four principle groups based on their location and orientation. The two groups hosting mineral resources are the Main Veins which dip easterly and are predominantly gold mineralization, while the East Veins dip to the west and have a much higher silver content then the main veins.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Water usage

Commodity Production

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Feb 21, 2026
.......................	.......................		Feb 21, 2026

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