The Alexandra occurrence is located on a northeast-trending ridge, southwest of the Toodoggone River and approximately 3.5 kilometres west-southwest of the river’s junction with Jock Creek.

Regionally, the area 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 Paleogene 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 Stuhini Group andesite flows and pyroclastic rocks, and marine sedimentary and volcanic rocks of the Lower to Middle Jurassic Hazelton Group. These 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 calc-alkaline volcanics of the Toodoggone Formation (Hazelton Group).

The dominant structures in the area are steeply dipping faults that 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.

Locally, chalcopyrite mineralization is hosted in Toodoggone Formation crystal lithic tuffs. This volcanic unit is believed to be shallowly underlain by mineralized Jurassic quartz monzonite related to the Jurassic Black Lake Suite. The occurrence is a continuation of the high-sulphidation alteration positioned within the volcanic rock overlying the intrusive monzonite stock. A stockwork vein system has been identified in the southeast portion of the anomaly near the intrusive contact.

In 2005, copper values in rock ranged up to 0.05 per cent and gold values in rock ranged from 0.039 to 0.57 gram per tonne, whereas samples from the stockwork vein system yielded values up to 2.1 gram per tonne gold and 0.4 per cent copper (Press Release, Stealth Minerals Ltd., September 29, 2005).

In 2007, diamond drilling yielded intercepts of up to 0.29 gram per tonne gold with 0.06 per cent copper over 8 metres, including 0.5 gram per tonne gold with 0.2 per cent copper over 2.0 metres, 0.43 gram per tonne gold with 0.08 per cent copper over 20 metres and 0.90 gram per tonne gold with 0.19 per cent copper over 2.0 metres in hole BCG-07-03 (Assessment Report 30339).

Work History

In 1999, Stealth Minerals staked the initial claims in the area of what is now known as the Sickle-Sofia property and, later that year, Standard Metals conducted a small-scale geochemical program on the area as the JC 1-2 claims on the behalf of Stealth Minerals.

In 2003, Stealth minerals completed a program of rock, silt and soil sampling and 78.4 line-kilometres of ground geophysical surveys on the Pine property. Also at this time, as part of a private-public partnership with the Geological Survey of Canada and the British Columbia Department of Mines and Energy, the Sickle-Sofia property was included in a multi-parameter helicopter-borne geophysical survey over the Toodoggone district. Several high potassium anomalies and low thorium-potassium ratio anomalies were detected.

In 2004, exploration by Stealth Minerals Ltd on their Pine/Sickle Creek property identified a coincident soil geochemical anomaly that averaged greater than 325 parts per billion gold with values of up to 1038 parts per billion gold in a 500- by 600-metre area within a copper soil anomaly of greater than 200 parts per million measuring 1000 by 600 metres. A program of trenching with a total of 313 1-metre rock chip samples were taken in the area. In 2005, a program of geological mapping was completed.

During the 2006 season, a total of 28 rock samples were taken from outcrop and float. Geophysical surveys were completed in the area between and covering the Sofia (MINFILE 094E 238) to Quartz Lake (MINFILE 094E 301) occurrences.

In 2007, BCGold Corporation completed a single diamond drill hole, totalling 259.2 metres, on the Alexander area.

In 2015, a program of geophysical review completed for Cazador Resources Ltd. on the Sofia property identified five target areas.

In 2017, Cazador Resources completed 239.0 line-kilometres of airborne magnetic surveying and a 2.5 line-kilometre ground induced polarization survey on the Sofia property.

See Sickle Creek (MINFILE 094E 237) occurrence for further details of the Stealth Minerals Limited Sickle-Sophia property.