Mabel Regional Geology

(R.S Friberg)

The northwestern portion of México is a complex setting similar to that of southern Arizona and southeastern California. The physiographic province is typical of the southern Basin and Range - elongate, northwest-trending ranges divided by wide alluvial valleys.

The property is located in the southern Arizona Mesozoic volcanic and plutonic province. Hydrothermally altered felsic volcanic, hypabyssal plutonic rocks and lesser Quaternary basalts underlie the general area.

Basement rocks include Precambrian gneisses, metamorphosed andesites and granites. These are overlain by younger Proterozoic quartzites and limestones, Paleozoic and Mesozoic carbonate rocks and Mesozoic volcanic, clastic and carbonate sediments rocks. The Mesozoic plutonic and Tertiary extrusive and intrusive rocks are related to volcanic activity of the Sierra Madre Occidental and are widely distributed.

Range front faults trend northwesterly and numerous low-angle shear zones related to thrust or detachment faults are the dominant structural feature. The Mojave-Sonora megashear (Anderson and Silver, 1979) is the principal regional feature. This wide zone separates Precambrian basement rocks of slightly different age and is occupied by a Jurassic magmatic arc composed of volcanic, sedimentary and plutonic rocks. The southwestern boundary of this megashear appears to be a major fault juxtaposing the Precambrian basement against the Jurassic magmatic terrain (Anderson and Silver, 1979).

Many of the gold prospects in Sonora occur within or adjacent to the southwestern boundary of the megashear in Precambrian, Mesozoic and Tertiary rocks. Silberman (1985) recognized a southeast-trending belt of gold occurrences, beginning at Sonoita on the border and including Caborca, Magdalena and Nocozari. Many of the gneiss-hosted or structurally controlled gold prospects of Sonora are broadly similar to the gold deposits mined along low-angle structures in southeastern California.

District and Property Geology

(Friberg and Brown etal 2002)

In the Mabel property area the dominant gravel-filled basin is bounded on three sides by outcropping basement rocks. To the west, the Sierra San Juan is a moderately elevated block of Mesozoic crystalline rocks. South and east is a low relief area composed of Mesozoic to upper Cretaceous intrusive and volcanic rocks, overlain by thin remnants of Tertiary volcanic and sedimentary rocks. The hill located at the northern property boundary, Cerro El Sombreretillo, is a good example of this sequence as the lowermost portion consists of moderately tilted (20° - 30° west to southwest) middle Tertiary and Mesozoic rocks overlain by upper Tertiary age conglomerates capped by a thin remnant of Quaternary/Tertiary basalt flow.

Normal Basin and Range faults found in the district affect rocks as young as middle Tertiary. High angle faults that have strikes of northeast, west-northwest and north-northeast form many of the contacts between both premineral and postmineral volcanic rocks and the Laramide plutonic rocks.

A major east-northeast trending regional fault is recognized just south of the Mabel 1 claim. This fault might be a detachment or simply a major break which supplied a conduit for fluid flow and thus gold, silver and copper mineralization (see Property Geology Figure under Deposit).
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Additional Info

Mabel Property

Mabel Property Technical Report Form 43-101F1

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