Summary

Mine Type	Open Pit
Study Completed	Feasibility
	Archived Information
Commodities	Silver Zinc Lead
Mining Method	Truck & Shovel / Loader
Mine Life	...
Snapshot	Pitarrilla, one of the largest undeveloped silver projects in the world. On January 17, 2022, Endeavour Silver Corp. acquired the Pitarrilla Project, located d in Durango State, Mexico, from SSR Mining Inc. Currently, Endeavour Silver Corp classifies the Pitarrilla Project as an exploration project. In Q4 2024, management announced that SGS Canada Inc., SGS Bateman, JDS Energy & Mining, T Engineering, Stantec and SRK Consulting have been retained to begin preliminary work on the project. The work will build on SSR Mining’s extensive previous work and will be used to advance the project to the development stage, forming the basis for an economic study in Q1 2026. Please note that all data, besides Geology and Mineral Resources, presented below is sourced from 2012 technical report and should not be regarded as up-to-date.

Deposit type

• Vein / narrow vein
• Epithermal

Summary:

The Property is located on the eastern flank of the Sierra Madre Occidental mountain range. This mountain range is the erosional remnant of one of the Earth’s most voluminous accumulations of intermediate to felsic volcanic rocks, which formed a calc-alkaline magmatic arc that was built during Eocene to early Miocene time, roughly 52 to 25 million years ago, in response to subduction of the Farallón tectonic plate beneath North America, this mountain building event is known as the Laramide Orogeny. A large number of medium to high-level hydrothermal systems variably enriched in Ag, Au, Pb, and Zn were intermittently generated during this extended period of volcanism, including the epithermal mineral systems that formed the great Mexican silver mining districts at Guanajuato, Real de Angeles in Zacatecas, Fresnillo, and Santa Barbara-San Francisco del Oro. The silver-lead-zinc mineralization found on the Pitarrilla property is situated in Central Mexican Silver Belt, a metallogenic province defined by the four previously noted silver mining districts along with the mining districts of Parral, Santa Maria del Oro, and SombrereteChalchihuites.

The Pitarrilla Project Ag-Zn-Pb deposit is hosted by deformed Cretaceous marine sediments and unconformably overlying Eocene (52 to 40 Ma) and Oligocene (32 to 28 Ma) volcanics volcaniclastics and intrusives. Eocene volcanics and volcaniclastics were derived from arc volcanism and from the erosion of subaerial arc volcanoes and deposited into a back-arc basin. Uplift of the basin was accompanied by extension and voluminous bi-modal volcanism with the emplacement of andesitic and felsic sills and dykes during the early Oligocene. The culmination of the volcanism was the development of a rhyolitic dome which crops out on Cerro La Pitarrilla.

Ag-Zn-Pb mineralization at the Pitarrilla Project occurs as a vertically stacked mineralised system centered on rhyolitic dykes and sills that constitute the feeder system for an early Oligocene volcanic center manifest by the rhyolitic dome. Sulphide-associated mineralization is rooted in the basement Cretaceous sedimentary strata and is represented by an aerially restricted but vertically extensive zone of disseminated and veinlet Ag-Zn-Pb (-Cu-As-Sb) sulphide mineralization and strata-bound massive replacement mineralization within a polymictic conglomerate that occur at the Cretaceous-Eocene unconformity.

The sulphide mineralization extends into the overlying Eocene and Oligocene volcaniclastic rocks and felsic sills, where it grades into mixed sulphide–oxide or transitional mineralization and a more laterally extensive zone of disseminated iron oxide-associated mineralization. The Ag-Zn-Pb mineralization is interpreted to have occurred during or after emplacement of the early Oligocene rhyolitic dome.

The Pitarrilla deposit is centrally located within the Central Mexican Silver Belt, which is defined by numerous Ag-Pb-Zn (±Au ±Cu) deposits and is classified as an intermediate sulphidation epithermal deposit.

Mining Methods

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Comminution

Crushers and Mills

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Processing

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Commodity Production

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Apr 24, 2025

Total Workforce	Year
......	2012