F3 Uranium Corp V.FUU

McArthur River Structural Geology

[Greenday]

The McArthur River deposit is a structurally-controlled unconformity-type uranium deposit with mineralization situated at the intersection of a pronounced fault zone and the unconformity between Paleoproterozoic Wollaston Group metasedimentary rock and Paleoproterozoic to Mesoproterozoic Athabasca Group conglomerate and sandstone at depths between 500 and 640m. Mineralization is variably hosted within the sandstone fault wedge and the faulted basement and consists of 12 pods covering a total strike length of 2700m.

The main fault zone, referred to as the P2 fault zone, consists of several regional-foliation parallel 0.5 to 4m wide faults containing narrow seams of graphitic clay gouge up to 5cm thick that are separated by highly cleaved, graphitic wall rock. Reactivation of the faults is evidenced by overprinting relationships of brittle and semi-brittle textures. The moderately southeast dipping fault zone is characterized by reverse offset of the unconformity surface and is dominated by dip-slip movement. It varies from a single discrete fault through to splay offsets consisting of two to three individual splays. The combined vertical offset along the P2 fault zone has a maximum of approximately 80m. The fault has emplaced a wedge-shaped sequence of Wollaston Group graphitic metasedimentary rocks into the Athabasca Group.

Foliation-oblique faults occur throughout the McArthur deposit trend. These faults are typically chloritic clay gouge-filled structures that are generally less than 5cm in width. West-northwest trending faults with steep northeast and southwest dips generally exhibit apparent oblique dextral sense of shear. Less common, and possible conjugate, faults trend north-northwest with a steep dip towards the east and an apparent sinistral sense of shear. Offsets are generally less than 2m on these structures. Southwest-trending and shallow northwest-dipping faults brittle faults with minor offsets (<1m) are also observed while rare northeast-trending and steeply dipping faults are also noted locally.

[SmokeyOB]

Interesting tidbit, interesting how people don't seem to care what the company reported. I was hoping to go up not down. Oh well, it'll flounder around for a while when people determine what they think. 

[stanem1]

Rivers. Tend to follow fault zones and springs flow up faults ,then deposit minerals in lakes or ponds