The San Marcial Area hosts complex geology and multi-phase mineralization, making it one of GR Silver Mining’s most prospective silver targets. Below is an overview of the regional geology, mineralization styles, and associated metals that underline the potential of the deposit.
Chargeability Map and Resource Update
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The San Marcial Area geology can be subdivided into two distinct rock types:
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Basement: undeformed late Jurassic volcaniclastic rocks.
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Overlying sequence: Early to Late Oligocene felsic ignimbrites, intermediate lavas, and basaltic layers, separated by an angular unconformity.
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Several diorite porphyry bodies of Oligocene age intrude the stratigraphy.
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Within the volcanic sequence, another angular unconformity separates two eruptive phases:
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30–28 Ma felsic ignimbrites.
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28–26 Ma volcanic phase.
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The silver exploration targets are hosted along a NW-trending crustal fault dipping 60° NE, extending 1.5 km in length and nearly 600 m down dip.
Mineralization Styles at San Marcial
The San Marcial resource hosts a series of high-grade silver hydrothermal breccias, indicating the system remains open at depth.
Three main phases of breccia mineralization:
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Tectonic breccia at the fault hanging wall, with hematite-rich matrix.
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Ore breccia filling stage, containing the highest silver grades at the center of the structure.
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Post-crackle hydrothermal breccia at the footwall.
Key features of the ore breccia stage:
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Telescoping of Zn-Pb-Ag-Au epithermal vein systems.
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Disseminated acanthite in calcite cement from a boiling event.
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Thin calcite veins running parallel to the breccia.
Alteration and Mineral Associations
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Upper system: barite, fluorite, magnetite.
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Lower system: epidote, chlorite, tremolite, actinolite, tourmaline, apatite, titanite, muscovite.
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Cross-cutting relationships suggest mineralization occurred within a short geologic window, bracketed between:
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Dioritic intrusions (~27.6 Ma).
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Younger rhyolitic dykes (~26.4 Ma).
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Multi-Commodity Potential
While San Marcial is primarily a silver deposit, mineralization is multi-phase, also hosting:
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Zinc and lead closely associated with silver.
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Gold mineralization in peripheral epithermal veins and stockworks.
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Recent GR Silver exploration has identified additional occurrences beneath the hydrothermal breccia.
409 Granville Street
15th Floor
Vancouver, BC, V6C 1T2
+1 647-293-8457
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409 Granville Street
15th Floor
Vancouver, BC, V6C 1T2
+1 647-293-8457