Geologic Setting & Mineralization

Regional & Local Geology

The Eden project is located along the lower western flank of the Sierra Madre Occidental (SMO), a prominent NW-trending volcanic belt that extends from one end of Mexico to the other on the Pacific side of the country.

The Late Cretaceous - Lower Tertiary volcanic package that formed the SMO is composed of a sequence of andesitic rocks, mainly tuffs, flows and agglomerates, also referred to as the Lower Volcanic Sequence (LVS), overlain unconformably by a thick sequence of rhyolitic and dacitic rocks composed mainly of tuffs, ash-tuffs and ignimbrites, referred to as the Upper Volcanic Sequence (UVS). The general regional structural features include a series of prominent NW-SE trending faults and lithological contacts.

The dominant volcanic rock type seen at Eden consists of andesitic tuffs, the host- rocks for the vein-breccia structures. Older carbonaceous sediments and limestones outcrop in a small portion of the Property to the northwest. In the center of the Property there is a granodiorite intrusive body that outcrops over an area of 600m by 900m.

Mineralization Style

The Eden Au and Ag-bearing structures are hosted in a system of N-NE trending, Easterly dipping, fissure-filling, quartz-rich veins and breccias, similar to Prime Mining’s ‘Guadalupe de Los Reyes’ mineralized system to the south.

El Eden vs Guadalupe Los Reyes

The Au and Ag mineralization found at Eden, like at Guadalupe de Los Reyes 10 km to the south, occurs in a series of quartz rich vein-breccia-stockwork structures which have a core high-grade, narrow vein, and a broader, 5m to 15m wide, lower grade envelope which consists of highly oxidized breccias and quartz stockworks.

Host rocks at Eden, like at Guadalupe de Los Reyes, are coffee-colored andesite tuffs, ash-tuffs and agglomerates.

Both Eden and Guadalupe de Los Reyes are spatially related to a nearby intrusive body.

The mineralized vein-breccias-stockworks systems extend for kilometers and dip moderatly to the E and NE.

At Eden, like at Guadalupe de Los Reyes, pre-mineral dacitic dikes are occasionally seen along the footwall of the mineralized structure. It is believed that an earlier volcanic event of rhyolite doming, rhyolite-dacite dikes and sills, created the plumbing system which served as the main conduit for the migrating mineralized fluids. 

Sugary and bladed lattice boiling textures were observed in some of the vein showings. The common occurrence of ‘green quartz’, a gold indicator in the SMO, and visible gold (VG) in most, if not all, of the oxidized veins in old mine workings that have been examined and sampled, suggest that these structures may contain high-grade zones.

From west to east, the mineralized veins at the Eden Property include the ‘El Eden-Guadalupana’, ‘Buenavista’, ‘La Paloma’ and ‘La Provedora’ N-NE trending veins, and to the east, a W-NW-trending, low angle, north-dipping high grade polymetallic vein called ‘La Republicana’.


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