The Lake II-IV (E. Ridge) occurrence is located on a steep north-trending ridge, approximately 3.5 kilometres east of the north end of Upper Belle Lake.

The occurrence area is situated within a Mesozoic volcanic arc assemblage that lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Neogene sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins.

Devonian-Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Stuhini Group andesite flows and pyroclastic rocks. These Stuhini rocks have been intruded by plutons and other bodies of the mainly granodiorite to quartz monzonite Early Jurassic Black Lake Suite and are in turn unconformably overlain by or faulted against Lower Jurassic calc-alkaline volcanics of the Toodoggone Formation (Hazelton Group).

The dominant structures in the area are steeply dipping faults that define a prominent regional northwest structural fabric trending 140 to 170 degrees. In turn, high-angle, northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.

The Stuhini Group surrounding the occurrence consists of intermediate to basic flows, pyroclastics and sediments. A series of limy beds, interbedded with laminated tuffaceous mudstone, tuffs, cherts and rhyolites strike northwesterly over a distance of 3.5 kilometres. These rocks are intruded by a medium-grained, porphyritic biotite granodiorite to quartz diorite stock. A major fault structure trends north along the Upper Belle and Midas lakes valley. To the west of this fault lie undifferentiated volcanics of the Lower-Middle Jurassic Toodoggone Formation (Hazelton Group). To the north, an east-trending fault also separates Stuhini Group volcanics from undifferentiated Toodoggone Formation volcanics.

Locally, quartz veining with pyrite and chalcopyrite are reported to be hosted in granodiorite, ironstone (magnetite?), feldspar porphyry dike and quartzite.

In 1987, five samples of mineralized quartz veining from the area yielded values from 0.06 to 0.73 gram per tonne gold, 1.0 to 34 grams per tonne silver and 0.381 to 1.00 per cent copper (Sorbara, J.P. [1989-08-18]: Amended Prospectus - PMA Resources Inc., Financial Statements).

Work History

The area has been explored in conjunction with the nearby Lake 2 (MINFILE 094E 178) occurrence and a completed property exploration history can be found there.