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Location: 157 km N from Durango, Durango, Mexico
Calle Cerro Gordo del Campestre No. 201, interior #208 Colonia Las QuintasLeonGuanajuato, Mexico37125
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On July 6, 2022, announced the successful completion of its acquisition of the Pitarrilla Project (“Pitarrilla”) from SSR Mining Inc. Endeavour purchased Pitarrilla by acquiring all the issued and outstanding shares of SSR Durango, S.A. de C.V. from SSR Mining and Silver Standard Ventures Inc. for total consideration of approximately $70 million.
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.
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