beltedclear, i see the bottom exit of the Ross River Pluton, according to reports played a major role in this area...

This old gabbro-granitoid magmatism both predates and postdates the Conley

Formation and has been traditionally included in the Wanipigow Plutonic Suite (Marr,

1971). The term Wanipigow Plutonic Complex is more appropriate however because

the term "suite" implies co-magmatic plutons whereas available geochronology data

indicate that the granitoid belt north of the Rice Lake belt is a complex of intrusions of

variable composition and ranging in age from 3.0 Ga to 2.73 Ga (Ermanovics and

Wanless, 1983; Turek et aI., 1989; Turek and Weber, 1994).

Ultramafic rocks also are present at Wallace Lake of which there are two distinct

varieties: serpentinite and actinolite schist. Serpentinite had been recorded at one

locality on the north shore of Garner Lake (Scoates, 1971) but Theyer (1983) noted

that this was but part of a more extensive body. It is likely, based on chemical

composition and on field characteristics, that this serpentinite is of the same type as

found along the Hay Creek Belt and north of Garner Lake. The actinolite schists

(McRitchie, 1971) also occur in association with the Conley Formation as thin

concordant lenses. They have been regarded as either unusual clay-rich magnesian

metasedimentary rocks or as varieties of ultramafic rocks but this is not easy to resolve.

Wanipigow River - Little Beaver Lake Area

A belt containing ultramafic rocks has also been recently identified within the

Wanipigow Plutonic Complex northeast of Wanipigow Lake (Poulsen et aI., 1994).

Coincident with a well defined airborne gradiometer anomaly (GSC,1988), this belt is

the northernmost of two branches which split from the Hay Creek Serpentinite Belt (Fig.

8). Massive serpentinite is exposed in several outcrops (Garson Hill) but cannot be

traced any farther eastward suggesting a fault contact between the east-west ultramafic

belt and a prominent northeast-southwest belt of mafic-felsic volcanic rocks though

Little Beaver Lake. The contact between these supracrustal rocks of the Little Beaver

belt and the tonalite to the west is intrusive but pre-tectonic as evidenced by the local

tectonic transposition of rocks in the contact zone. Although the supracrustal rocks of

the Little Beaver belt are portrayed on some existing maps as metagreywacke, at least

some of them are actually intermediate to felsic volcanic rocks that have been

metamorphosed to the amphibolite facies, resulting in their high biotite content. Patchy

gossan zones within some felsic volcanic units are suggestive of synvolcanic sulphidic

stockworks and the local presence of garnets may reflect a precursor synvolcanic

hydrothermal alteration such as is known to occur in the vicinity of volcanogenic

massive sulphide deposits.

16.........

Although there is still much to be learned about the origin of these assemblages

and their interrelationships, there are some clear alternatives of interpretation. The

distribution of the assemblages suggests an original age and lithological progression

from northeast to southwest: older Mesoarchean quartz arenite- bearing Conley

Formation (Wallace Lake) and komatiite-bearing successions (Garner Lake) are both

cut by ultramafic intrusions and give way southward to Neoarchean tholeiitic and calcalkaline

volcanic rocks and subvolcanic intrusions formed mainly between 2730 and

2720 Ma in a submarine to locally subaerial arc (Bidou Lake, Gem Lake). Flyschoid

rocks (Edmunds Lake) were deposited southward of this arc, possibly in a forearc

accretionary wedge and molassic rocks (San Antonio) were deposited in more

restricted basins, presumably in response to rapid uplift of the arc volcanics during

faulting under transpressional conditions.........

The Ogama-Rockland Mine

The Ogama-Rockland Mine produced approximately 134,000 Tonnes of ore at a

grade of 12.3

glt during sporadic operation from 1942 to 1951. Production was from

narrow veins within the tonalitic rocks of the Ross River Pluton. The shear zones

hosting the gold-bearing veins dip steeply to the northeast (Fig. 21). The largest ore

shoot plunges steeply in the Ogama Shear and, according to Troop (1949), the "major

ore shoots appear to be connected with warpings in the shear plane". The ore shoot is

broadly coincident with a right step (a bend to the right viewed along the strike of the

shear zone) and a slight change in the attitude of the shear zone to a more northernly

orientation to the south of the ore shoot.

Striations and mineral lineations plunge shallowly to the northwest in the Ogama

Shear where it outcrops just northwest of the shaft (Fig. 21). Foliation in the shear

zone is oblique to its boundaries in such a way as to indicate dextral movement.

~0.02%

Cu or Pb.

Geochemical data published in Theyer (1991) from a property appraisal report, dated

1936 (Conley Jr., pers. comm.1990) list: "erratic, in cases very high gold and silver

Au and