- SMDI #
- 2536
- Current Showing Name
- Julie Au Showing
- Historical Showing Names
- Julie Au Showing
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 612311.9400
- UTM Northing (NAD83 Z13)
- 6136096.7900
- NTS Sheet
- 063M06
- TRM (Township-Range-Meridian)
- 73-08-2
- Primary Commodities
- Gold
- Associated Commodities
- Copper, Iron
- Discovery Type
- Outcrop Grab
- Status
- Occurrence: Primary Exploration
- Geological Details
- The Julie Gold Showing is located 2.4 km (1.5 miles) east of the most southerly bay of Manawan Lake, 1.69 km (1.05 miles) southeast of the Royex Quartz Swarm Showing or SMDI 2249, and 175 m (0.10 mile) west of the topographic trace of the Tabbernor Fault. The showing occurs at grid coordinates 5+00S and 6+00E.
The showing area is underlain by the Wood Lake batholith - a granite to granodiorite intrusion that forms a north-south elongate body approximately 58 km (36.0 miles) long and 13 to 16 km (8.1 to 9.9 miles) wide. The batholith has been invaded by a series of small gabbro to diorite composite intrusives. These basic intrusives host the showing mineralization. The eastern margin of the batholith contacts a narrow band of Pine Lake Group intermediate to mafic metavolcanics, volcaniclastics, and metasediments. To the east of the Pine Lake Group rocks, one finds a folded series of arkose, quartzites, and conglomerates known as the Ourom Lake Arkoses.
Structurally, the main feature in the showing area is the Tabbernor Fault. This north-northwest trending fault cuts the Pine Lake Group rocks. Kirkland (1956) noted that a 100 to 150 m (328.1 to 492.1 ft) wide heterogenous shear zone flanked the trace of the Tabbernor Fault. Kirkland further noted that a 2.5 km (8.2 ft) wide zone of 10 to 150 cm (3.9 to 59.1 inches) wide minor shears flanked the west side of the Tabbernor Fault where the fault cuts the Wood Lake Batholith. The rocks in the showing area have been folded and two major dome-like structures (the Seigel Lake Dome and the Manawan Lake Dome) and several small anticlines and synclines are present. These north-south elongated domes (or doubly-plunging anticlines) are cut by a series of north-northeast trending, steeply dipping shear zones that are likely splays of the main Tabbernor fault. Associated with the splay faults, one finds quartz veining and a series of dykes of various compositions. The quartz veins and dykes appear to be syn- and post-deformational. This quartz veining and the dykes locally serve as hosts for the gold mineralization.
The pyrite-chalcopyrite-gold mineralization in the showing area can be split into two styles:
(1) gold hosted in north and east-northeast trending quartz veins
associated with the north- to northeast-trending splay shears.
This shear hosted mineralization is found in and adjacent to the
basic intrusives that cut the Wood Lake batholith. The auriferous
quartz veins vary in width and length and occur as single veins
and as "swarms" of veins. In a swarm, not all veins are
mineralized.
(2) gold hosted by north to northeast trending felsic dykes. This
includes gold mineralization in fine-grained quartz porphyry
and in cherty schists. This style of mineralization, which is
often high grade across narrow widths, is usually uneconomic.
The Julie Gold Showing, which was discovered in 1989 while prospecting the western scarp face of the Tabbernor Fault, consists of a 5 m (16.4 ft) wide by 30 m (98.4 ft) long area of discontinous auriferous quartz veining within north-south-trending shear zones in highly epidotized and silicified 350°-360°/78° to 83°E-trending Pine Lake Group mafic metavolcanics. Individual mineralized quartz veins vary from 0.6 to 9.1 m (2 to 32 ft) in length and from a 0.5 cm to 0.2 m (0.2 inches to 0.9 ft) in width. The gold values increase from south to north and the quartz veining goes from several narrow veinlets, in the south, to a single 0.8 ft wide vein in the north.
The up to 10% disseminated pyrite and chalcopyrite within the quartz veining returns gold values when assayed. Soil sampling over the showing returned a maximum value of 10 ppb Au. Grab samples taken returned the following values:
SAMPLE SAMPLE SAMPLE PPB OZ/TON PCT PPM PPM PPM VEIN
NUMBER TYPE WIDTH AU AU CU AG ZN NI WIDTH
___________________________________________________________________________
WS-39 grab ----- >1000 0.352 ---- --- -- -- 24.4 cm
39865 grab ----- >1000 0.183 ---- --- -- -- 24.4 cm
39866 grab ----- >1000 0.056 ---- --- -- -- 24.4 cm
39861 grab ----- 140 ----- 1.47 5.4 41 10 0.5 cm
- Geological Domain
- Glennie
- Host Rocks
- Host Minerals
- Pyrite
- Indicators
- Exploration History
- 7/7/1993 The first recorded work in the showing area was an airborne EM and magnetic survey flown by Mansa Exploration in 1957 (AF 63M03-0001).
On 17 July 1987, Royex Gold Mining Corporation staked the showing area as S-99403. Preliminary examination of the property included reconnaissance prospecting and grab sampling. One grab sample taken during this program returned 1,163 ppm Au.
In 1988, Taiga Consultants Ltd. were contracted to geologically map and prospect the property and to complete a VLF-EM survey and soil, rock and till sampling (AF 63M06-0032). This initial work located several areas characterized by northeast trending "swarms" of shear hosted auriferous quartz veining. In the same year, Taiga completed detailed mapping and prospecting, infill soil sampling, outcrop stripping, and ground VLF-EM and magnetic surveys over the showing (AF 63M06-0033). In September of 1988, Taiga completed additional soil sampling, outcrop stripping, detailed geological mapping and prospecting and chip and soil sampling (AF 63M06-0034). This work led to the realization that there were three separate areas of mineralization - the Western Zone Showing, the Quartz Swarm Showing or the Main Zone area, and the Royex Quartz Swarm Showing. The Royex Quartz Swarm Showing was examined. Four areas of better gold concentration were delineated and named the Royex Showing, Ed's Showing, Nigel's Showing and Roland's Showing.
In 1989, Corona Corporation optioned S-99403 and completed further mapping, prospecting and soil and rock sampling southeast of the already discovered showings along the trace of the Tabbernor Fault (AF 63M06-0039). This work resulted in the discovery of the Julie Gold Showing by Wolfgang Stoeterau. The showing was stripped, trenched, and detail mapped.
- Production History
- Reserves and/or Resources