Summary

Mine Type	Underground
Status	Active
Commodities	Silver Zinc Lead
Mining Method	Hydraulic mining Longhole open stoping Sub-level open stoping (SLOS) Cut & Fill
Backfill type	...
Production Start	...
Mine Life	...
Snapshot	The Endeavor mine had operated continuously for 38 years before being placed on care and maintenance in 2020. On June 16, 2025, Polymetals Resources advised that commercial production has been achieved at its Endeavor silver zinc mine. Optimisation of the grinding and flotation circuits is continuing to ensure consistent production of high-grade zinc and silver-lead concentrates.
Latest News	Polymetals Resources Ltd: Operations resuming at the Endeavor Mine     November 6, 2025

Deposit type

• Tailings
• Vein / narrow vein

Summary:

Underground Resource
Mineralisation at the Endeavor deposit (initially known as the Elura) is hosted by fine grained turbidite sequence of the Cobar Basin and comprises multiple sub-vertical elliptical shaped pipe-like pods that occur within the axial plane of an anticline and are surrounded by an envelope of sulphide stringer mineralisation, in turn surrounded by an envelope of siderite alteration extending for tens of metres away from the sulphide mineralisation.

Around 150m below the base of the main mineralised pods/lodes, mineralisation is hosted within the western limb of a folded limestone unit, occurring in veins and fractures.

Recent reviews favour a syngenetic formation model of an original stratiform deposit that was later emplaced by tectonic force into a favourable structural site during deformation.

The zonation of mineralisation types has been categorised with abbreviations as follows:
o PO – massive pyrrhotite-pyrite-galena-sphalerite ore, with pyrrhotite predominant, forming the central core of all zones, typically averaging about 9% Zn and 6% Pb
o PY – massive pyrite-pyrrhotite-galena-sphalerite ore, with pyrite predominant, commonly surrounding the pyrrhotitic core or at the outer margin of massive mineralisation, again typically averaging about 9% Zn and 6% Pb.
o SIPO – siliceous pyrrhotite-pyrite-galena-sphalerite ore, with inclusions of silicified country rock and some quartz veining; pyrrhotite is the predominant sulphide; occurs at the margin of PO and PT mineralisation; typical ore grade averages around 12% combined Pb+Zn.
o SIPY – siliceous pyrite-pyrrhotite-galena-sphalerite ore, with inclusions of silicified country rock and some quartz veining; similar to SIPO but pyrite is the predominant sulphide.
o VEIN – lower grade mineralisation comprising a stockwork of quartz and sulphide veins within silicified siltstone, around the edges of mineralised pods.
o MINA – mineralised altered siltstone.
o SG – Supergene enriched zone at the top of the Main Lode.

Tailings Resource
Mineralised material in the tailings storage facility consists of clay to fine sand sized particles deposited in sub-horizontal layers from centrally located outflow sites. The particles contain remnant sulphides that were not captured during processing of the Endeavor Mine silver-zinc-lead ore.

The primary lead and zinc bearing minerals from all orebodies processed are galena (~13%wt) and sphalerite (~14%wt). Pyrite and pyrrhotite (~60 to 70%wt in total) are the main floatable gangue in the ore. Tetrahedrite is the major host of silver, apart from galena and chalcopyrite.

Dimensions
Underground Resource
The sub vertical high-grade pods occur in the axial plane of an anticline and progressively decrease in size towards the northwest. The Main Lode occurs at the southern end of mineralisation, extending from near-surface to approximately 1,000m depth, with lateral extents of between 50m and 120m. The Northern Lodes extend northwest from the Main Lode, generally occur only below a depth of 400 – 500m and have lateral extents typically between 30 – 50m.

The top of the limestone-hosted mineralisation occurs approximately 1,050m below the surface. The mineralised zone is broadly tabular in form and currently measures 300m long by 250m high with widths ranging between 10m and 30m, dipping around 70° towards the southwest.

Tailings Resource
The Resource estimate entails the bulk of Sector 1 of the CTD TSF, which measures approximately 550m by 850m and an average depth of 7m.

Mining Methods

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Comminution

Crushers and Mills

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Processing

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Commodity Production

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Nov 15, 2025
.......................	.......................		Nov 15, 2025
.......................	.......................		Nov 15, 2025

Employees	Total Workforce	Year
......		2024
......		2021
......		2020
......		2019
	......	2018