The Leghorn 1 prospect is located approximately 4 kilometres northwest of Drybrough Peak, some 280 kilometres north of Smithers. The occurrence lies within the Omineca-Cassiar mountains at the southern end of the Toodoggone gold camp. The prospect is situated within a Mesozoic volcanic arc assemblage which lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Tertiary sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins.

Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Takla Group andesite flows and pyroclastic rocks. These Takla 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 calcalkaline volcanics of the Toodoggone Formation, Hazelton Group.

The dominant structures in the area are steeply dipping faults which 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 Leghorn 1 prospect is underlain by porphyritic augite plagioclase andesite flows and breccias with lesser siltstone, tuffaceous sediments and limestone of the Takla Group. These Takla Group lithologies are bounded on the west by quartz diorite to diorite of the Black Lake stock. Propylitic alteration is commonly well developed in the Takla Group volcanics, particularly around porphyritic diorite dikes. Quartz and/or carbonate veining is moderately common as individual veins and as vuggy stockworks. Hematitic and limonitic alteration is common around these veins and stockworks.

The Leghorn 1 prospect consists of a quartz-calcite vein system, extending from about the 1823-metre elevation downward along a 325-degree trend for 250 metres. The average width is 40-centimetres and in several places the vein horsetails into narrow stringers. A crosscutting fault offsets the vein by up to 40 metres. Galena, chalcopyrite and sphalerite are disseminated throughout the vein.

In 1983, rock samples (AA-26850 and AA-26852) yielded values of up to 0.118 per cent copper, 3.3 grams per tonne silver and 0.325 gram per tonne gold (Assessment Report 11525).

In 1985, a rock sample (E-12) assayed 266 grams per tonne silver, 0.12 gram per tonne gold and 31.12 per cent lead, while a sample of quartz vein float (JO-28) taken approximately 800 metres to the west- southwest yielded 2.80 grams per tonne gold and 69 grams per tonne silver (Assessment Report 14167).

Sample LH88 190, taken in 1988, analysed 8.3 grams per tonne silver, 0.345 per cent zinc, 0.327 per cent lead and 0.160 per cent copper (Assessment Report 17898). Other samples from this vein assayed as high as 58.0 grams per tonne silver, 2.33 grams per tonne gold and 2.05 per cent zinc (Assessment Report 17898). Also at this time, two samples (LHR-1 and -4), taken from the area of the 1985 sample JO-28, assayed 2.34 and 0.51 grams per tonne gold with 58.0 and 41.0 grams per tonne silver (Assessment Report 17898).

Work History

In 1983, Kidd Creek Mines Ltd. completed a program of prospecting, geological mapping and rock sampling on the area as the Foghorn and Leghorn claims.

In 1985 and 1988, Energex Minerals Ltd. completed programs of rock, silt and soil sampling on the area as the Leghorn claim.

Refer to the Pine (MINFILE 094E 016) for details of the Pine property which contained the occurrence from the late 1990s to 2014. Exploration work included programs of rock and soil sampling, geological mapping and airborne geophysical surveys.

During 2016 through 2018, Amarc Resources Ltd. completed programs of soil and rock sampling, geological mapping, 115.0 line-kilometres of ground induced polarization surveys and 1940.0 line-kilometres of airborne magnetic surveys on the area as the Joy property.