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Rimfire Portfolio - Williams Gold, BC

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The William's Gold Property (formerly the Bill Property) covers two distinct gold-bearing prospects in north-central British Columbia. The T-Bill Target is a 3 sq. km area of carbonate alteration, highly anomalous gold-arsenic soil geochemistry and gold-bearing quartz-sulphide veining. The GIC (formerly Park) prospect, located 3 kilometres to the north, is a little explored 500 x 900 metre gold-copper soil geochemical anomaly centred on a prominent gossan. These two prospects were discovered independently by major companies conducting regional stream-sediment sampling programs in the early 1980's. In the early 1980's, 15 diamond drill holes were completed at the T-Bill prospect, returning intersections such as 2.0 metres of 35.0 g/t gold, and 4.0 metres 11.0 g/t gold, 1.5 metres of 24.7 g/t gold, and 2.0 metres of 24.8 g/t gold.

The William's Gold Project was acquired based on results from an in-house compilation of publicly available material for the Toodoggone region of British Columbia. The compilation outlined an area of highly anomalous gold-arsenic(+/-copper-molybdenum-bismuth-antimony-barium) silt geochemistry from government regional surveys (RGS) coincident with a 10 km diameter magnetic low anomaly centred southeast of the T-Bill. Rimfire acquired the property based on the extent of the hydrothermal system present at William's Gold as evidenced by the widespread gold-rich veining, alteration, geochemical anomaly and magnetic low anomaly. A summary of the 2001 work program and results can be found in news release PR01-10 in the News Archive section of this site.

Wholly Owned

Rimfire owns a 100% interest in the 107.3 sq. km property subject to a 1.25% Net Smelter Return. Arcus Development Group, who signed an option agreement to explore the Williams Property in 2006, has announced that it does not intend to continue exploration on the property (see PR08-03). Rimfire will retain 100% of the property. The company is actively seeking a partner to advance the Williams targets.


The Williams property is host to two significant and different exploration targets; porphyry copper gold at the GIC prospect that has never been drill tested and high grade mesothermal gold veins at the T-Bill prospect. Rimfire acquired the property based on an in-house compilation of data for the Toodoggone region of British Columbia. The compilation highlighted the Williams, an area of anomalous gold-arsenic silt geochemistry coincident with a large magnetic low feature.



Porphyry-Related Gold Mineralization - GIC Prospect

The GIC prospect (formerly the Park)

• 500 by 1,400 metre >100 ppm copper soil geochemical anomaly with two > 100 ppb gold subanomalies measuring 300 by 500 metres and 300 by 750 metres.

• Induced Polarization (IP) anomaly 1800 metres long, open to the east and west with chargeability values of 12.5 - 40 mV/V and resistivity values of 2000 - 10,0000 ohm-m.

• IP anomaly is 300 metres wide on surface and extends a further 400 metres to the south under a till blanket that also cuts off the soil geochemical anomaly.

• Surface mineralization on the margins of the IP anomaly include 1.2 metres of 2.7 g/t gold and 0.1% copper and another of 3.73 metres of 0.22% copper and 0.22 g/t gold (width limited only by the outcrop exposure).

Mesothermal Style Gold Mineralization - T-Bill Prospect

The T-Bill

• Fourteen holes drilled at the T-Bill vein prospect within a 300 by 300 metre area have intersected eleven separate intercepts in excess of 12 g/t gold.

• WG03-10 intersected 6.92 metres of 6.0 g/t gold, 1.63 metres of 12.8 g/t gold, 2.00 metres of 7.7 g/t gold, and 0.60 metres of 12.7 g/t gold.

• Oriented core confirms NW-SE trend of mineralized vein swarm that remains open along strike in both directions and down dip.

The Williams property can be divided in two by the east west-trending Grass Fault, which is responsible for several thousand metres of apparent vertical displacement, juxtaposing deformed phyllites and schists of the Devonian-Permian Asitka Group to the south against undeformed Upper Triassic Takla Group volcanic rocks to the north.

North of the Grass Fault, Upper Triassic Takla Group unfoliated, andesite and basalt host the GIC prospect. Two small outcrops of crowded feldspar porphyry intrusive have been mapped in the vicinity of the GIC prospect. Several gossans are exposed in bare patches extending over a thousand metres. These are associated with chloritized, sericitized and silicified andesitic rocks, containing abundant pyrite and goethite. Six samples from these gossans, taken from both float and outcrop, returned 1280 to 4740 ppb gold. Mineralization in this area is accompanied by elevated copper and molybdenum (max. 1045 ppm copper, 867 ppm molybdenum), variable arsenic and generally low lead, antimony and zinc levels. Mineralization sampled to date lies within a 500 x 1,400 metre copper-gold soil anomaly, which remains open to the west and which is covered by till to the south and east.

Four intensely fractured outcrops are exposed over 85 metres in the southern bank of GIC Creek, a few tens of metres north of the Grass Fault. Three of the outcrops consist of strongly sericitized andesite; the fourth is of strongly sericitized crowded feldspar porphyry. Primary sulphides are rare, due to the extreme fracturing, and consist of chalcopyrite, pyrite, molybdenite, magnetite and specularite. Malachite, neotocite and rare native copper are locally present on fractures, with goethite and hematite. Samples taken from these patches in 2005 returned 821-2200 ppm copper, 29-220 ppb gold and 7-22 ppm molybdenum, with extremely low lead, zinc, arsenic and antimony levels. A continuous chip sample gave 2200 ppm copper and 220 ppb gold along 3.73 metres, limited only by the extent of outcrop dug out. A poorly constrained prospecting sample believed to be from this area assayed 0.186% molybdenum.

South of the Grass fault at the T-Bill Prospect, Jurassic age granitic rocks intrude beneath a structural dome comprised of Devonian to Permian metamorphic phyllites and schists. The phyllites/schists are pervasively carbonate and sericite altered over a broad area that coincides with a 2 by 3 kilometre greater than 100 ppb gold and greater than 100 ppm arsenic soil geochemical anomaly. Gold mineralization consists of mesothermal quartz-pyrite-arsenopyrite veins that occur as isolated veins and vein swarms. Oriented core measurements indicate an average strike of 295o and steep dips for the mineralized veins. Previous drilling (15 holes) over an area measuring 500 by 900 metres intersected numerous high grade gold-bearing intervals including 6 separate 2 metre intercepts containing in excess of 15 g/t gold. Native gold is present and gold mineralization is associated with disseminated and vein hosted pyrite and arsenopyrite.