Summary

Mine Type	Underground
Study Completed	Preliminary Economic Assessment
Status	Inactive / Suspended
Commodities	Zinc Lead Copper Silver Gold
Mining Method	Mechanized Cut & Fill Avoca Longitudinal retreat Sub-level open stoping (SLOS) Sub-level Retreat Post Pillar Cut & Fill Transverse open stoping
Backfill type	...
Mine Life	...
Snapshot	The Halfmile-Stratmat integrated project is comprised of the Halfmile mine and the advanced exploration stage Stratmat project. On Aug. 19, 2022, Trevali Mining Corporation announced that the Company had received an Initial Order for creditor protection from the British Columbia Supreme Court under the Companies' Creditors Arrangement Act (the "CCAA"). On June 30, 2023, Trevali Mining Corporation announced that the Supreme Court granted an order in the Company's ongoing CCAA proceedings pursuant to which FTI Consulting Canada Inc., the Court appointed "Monitor", has been granted enhanced powers in the CCAA Proceedings with respect to the Company's business and affairs. The Monitor's powers to manage the Company, the Company's remaining employees have ceased their employment with the Company. Please note that all data presented below is sourced from 2017 technical report prepared by SRK Consulting (Canada) Inc.

Deposit type

• VMS

Summary:

The Halfmile and Stratmat projectss are volcanic massive sulphide (VMS) deposits typical of the Bathurst Mining Camp (BMC). The BMC hosts 45 volcanic-sediment hosted massive sulphide deposits and 95 occurrences, including the world-class Brunswick 12 Mine. BMC deposits formed in a sediment-covered back-arc continental rift during periods when the basin was stratified with a lower anoxic water column. The basin was subsequently intensely deformed and metamorphosed during multiple collisional events related to east-dipping subduction of the basin.

The VMS deposits typically form lenses of polymetallic massive sulphide. Most deposits are zoned vertically and laterally from a high temperature, vent-proximal, copper-polonium bismuth-rich veined and brecciated core to vent-distal zinc-lead-silver-rich hydrothermal sediments. The vent complex is commonly underlain by a highly deformed sulphide stringer zone that extends hundreds of metres beneath deposits and consists of veins and impregnations of sulphides, silicates, and carbonates that cut chloritized and sericitized volcanic and sedimentary rocks.

The Halfmile project is underlain predominantly felsic volcanic rocks and lesser sedimentary rocks which are host to all massive sulphide deposits on the property. Provincial Government regional mapping projects have classified the rocks as belonging to the Flat Landing Brook formation of the Middle Ordovician Tetagouche group and Nepisiguit Falls formation.

At Halfmile, the Flat Landing Brook formation consist mainly of rhyolite flows, quartz-feldspar porphyry and mafic volcanic rocks. The Nepisiguit Falls formation includes the massive sulphide mineralization, quartz-feldspar porphyry and clastic sedimentary rocks.

The stratigraphy for Halfmile is overturned. A stockwork of pyrrhotite-chalcopyrite mineralization occurs on top of the massive sulphides. Well-developed S1 foliation/cleavage is easily observed in most drill core samples. In general, the enveloping surface for this cleavage is oriented northeast with a dip of 40 to 60° to the northwest. An S2 crenulation cleavage accompanied by small parasitic kink folds is oriented at a high angle to the S1 foliation in the nose of folds.

Detailed interpretations are difficult to assess due to poor documentation in old holes and difficulty in assessing structure from drill data. Faulting is poorly documented in pre-1970 drilling. However, later interpretation suggests the influence that faults have on the sulphide horizon. A single thrust fault is readily observed immediately above or within the sulphide horizon. This fault occurs in about the same stratigraphic position on all of the Halfmile project. Local small-scale sheath folds may increase the thickness and grade within the hinge of the Lower Zone.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Commodity Production

Operational metrics

Personnel

Job Title	Name	Phone	Email	Profile	Ref. Date
.......................	.......................	...........	...........		May 26, 2025