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PROPERTY GEOLOGY
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Property
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The Moss Lake property is underlain by a sequence of felsic volcanic rocks ranging from fine tuffs to coarse fragmentals. The volcanic rocks are intruded by a swarm of syenites, diorites and feldspar porphyries. The central portion of the property is underlain by a diorite and diorite porphyry which hosts the gold mineralization and is called the Wawiag Sill. The gold mineralization is associated with hydrothermally altered diorite.
The sheared and altered diorite sill is variable in composition ranging from a trondhjemite to quartz feldspar porphyry to feldspar porphyry. However, the sill is not “layered” or “differentiated.” The entire sill is somewhat sheared and altered with alteration consisting mainly of sericite and carbonate with lesser chrlorite, hematite and epidote (little silicification or quartz veining). The central part of the sill (400-500 feet wide) is highly sheared and altered and contains most of the gold-bearing zones. The 400-500 foot central zone actually comprises several stronger, parallel mineralized shears separated by less sheared and less altered material. In the more intensely sheared and altered sections, the rock becomes a sericite schist. All mineralized zones have a near-vertical dip.
Shearing seems to be most intense in porphyritic rocks and in some areas (toward the east end) the shearing and alteration have produced a fine-grained rock containing fairly large rotated quartz phenocrysts (augens) which have been called a “quartz eye schist” (hence QES Zone).
Post-mineralization faulting is quite extensive with two main faults: one strikes N-S and it’s most westerly member cuts the west end of the sill and displaces it to the south about 2000 feet. A second fault of this set separated the Main Zone from the QES Zone with displacement of about 150 feet west side south. The second set of faults strikes about N50º E and is prevalent in the south part of the sill. This set intersects the mineralized zone at the East end of the QES zone. |
