The Forks occurrence is located approximately 7 kilometres north of Nanitsch Lake, on an unnamed creek that drains the lake. The Falls showing, included in this occurrence, is less than 1 kilometre upstream.
The unnamed creek follows a major north trending fault that separates the Lower to Middle Jurassic Hazelton Group (in this area, probably the Telkwa Formation) to the west, and the Upper Triassic Savage Mountain Formation (Takla Group) to the east. This fault terminates against a major northwest trending fault.
The area is underlain by andesites and basalts intruded by monzonitic to syenitic intrusions. These rocks are all intruded by quartz-feldspar porphyry dykes which are possibly related to the Eocene Kastberg Intrusions.
Mineralization occurs in two different styles. At the Forks showing, mineralization comprising mainly galena and sphalerite is associated with quartz carbonate fault breccia zones and silicified shear zones. Minor chalcopyrite and associated hematite are also present. These fault breccias cut through lapilli tuffs, basaltic flows and breccia flows. The host rocks are fractured and filled with carbonate and prehnite. A 0.9-metre drill interval from a silicified shear zone assayed 0.15 per cent lead, 0.14 per cent zinc, 5.1 grams per tonne silver, 0.11 per cent copper and 5.4 grams per tonne gold (Assessment Report 19860).
At the Falls showing, mineralization is dominated by copper and gold within the volcanics and associated alkaline intrusives. Chalcopyrite, bornite and chalcocite occur disseminated and in amygdules within the amygdaloidal phases of the andesites. Hematitic, pyritic, silicic, chloritic and potassic alteration is prevalent throughout this showing. A 1.5-metre drill intersection of fractured and amygdaloidal (pyrite with trace chalcopyrite) andesite and latite tuffs assayed 0.11 per cent copper and 3.84 grams per tonne gold (Assessment Report 19860).
In 1989, Windflower Mining Limited completed a program of diamond drilling on the property. The most significant drilling intersection included 7 metres of 1.1 per cent copper and 1.72 grams per tonne gold. A 0.45 metre sample from the most northerly end of the initial discovery zone returned 13.42 grams per tonne gold, 474.7 grams per tonne silver, 8.7 per cent copper, 0.83 per cent lead and 1.32 per cent zinc (Property File Rimfire Windflower Mining Ltd., 1989).
In 2007, a new copper showing was discovered by Imperial Metals, the East Creek showing, located 3.3 kilometres southeast of the Forks showing. Imperial Metals also relocated the previously reported “Third showing”, roughly 2.7 kilometres southwest of the Forks showing on an easterly running tributary of Falls creek. Best results from field samples came from known showings, most notably the Forks showing which yielded the best copper and gold result of the program.
Drill holes FC-07-01 and FC-07-02 tested magnetometer highs situated 675 metres and 1.8 kilometres west of the Forks showing, respectively. In hole FC-07-01, six samples graded higher than 0.1 gram per tonne gold with the highest being 0.9 gram per tonne over 0.85 metres, with the highest copper being 0.18 per cent over 0.60 metres. Hole FC-07-02 did not return any significant values in copper or gold (Assessment Report 29982).
Hole FC-07-04 tested the Falls Showing with one of the better intervals (32.81 to 52.50 metres) grading 0.44 grams per tonne gold over 19.69 metres, including 0.79 grams per tonne over 7.50 metres (Assessment Report 29982). Results in copper were weaker with only three samples grading over 0.1 per cent, with a high being 0.26 per cent over 2.50 metres (Assessment Report 29982). Hole FC-07-05, drilled to test the Forks showing, intersected several units of volcanic and tectonic breccias as it passed through the Falls creek fault valley. Alteration consisted of intense hematization, strong calcite veining and some weaker epidote flooding. Some higher than background copper and silver was intersected from 157.04 to 230.35 metres. Unfortunately, the hole did not intersect any significant gold mineralization. Only one sample yielded significant copper at 0.49 per cent over 1.18 metres (Assessment Report 29982).
WORK HISTORY
Mineralization was noted at the site of the “Forks” showing during a heavy mineral survey conducted throughout the region in the early 1980’s and the “Falls” showing was located in early 1989 after the staking of the Omini 1 mineral claim (Peatfield, 1989 (unpublished report for Windflower Mining Ltd). The Forks and Falls showings are located along Falls Creek, within 500 metres of each other.
In 1989, Windflower Mining Ltd. staked four mineral claims (OMINI 1 to 4), each consisting of 20 units. Later in the year, Windflower staked an additional 9 claims tied to the original claim block, totaling 163 units. One single fractional claim and four additional “two-post” claims were also staked during the summer of 1989 (Peatfield, 1989 (unpublished report for Windflower Mining Ltd). The “Omini” property consisted of 17 mineral claims totaling 247 mineral claim units by September 1989 (Assessment Report 19860).
In September 1989, Windflower Mining Ltd. drilled eight holes, totaling 364 metres (Ryznar, 1990). All drilling was conducted on mineral claim Omini 1. Five holes totaling 138.7 metres were drilled at the “Forks” showing and 3 holes totaling 225.4 metres were drilled at the “Falls” showing (Assessment Report 19860). The 1989 drilling yielded low values in copper and gold. Windflower Mining Ltd. subsequently dropped the property.
In early 2006, the open ground was staked by Gerald Ryznar of North Vancouver. Four mineral claims were staked, creating the Falls Creek Claim Group (Falls Creek 1 – 4). The area of the claim group totaled 1,404 hectares. In June 2006, Mr. Ryznar optioned the Falls Creek property to Imperial Metals Corporation. In May of 2007 an additional four claims, Falls 1-4, totaling 1550.71 hectares were staked by Imperial Metals.
In 2006 Imperial Metals Corp conducted 255.8 kilometres of airborne magnetic and radiometric surveys over the Falls Creek property. The survey identified approximately seven discreet magnetometer highs. These targets were all prospected and samples taken from outcrop if any was present. Two of the strongest of these targets were drilled during the program. The Radiometric survey data as presented was of a general nature and was reported to have not produced any targets of interest.
In 2007, Imperial Metals Corp. completed 1278.6 metres of diamond drilling in 5 NQ2 holes and collected 88 rock samples during a prospecting program. One hole each were drilled on the Forks and Falls showings, two holes were drilled on two magnetic highs to the west of the Forks showing and 1 hole was drilled on the new "Third Showing."