The Jimmie area is underlain by minor syenite dikes and diorite to monzonite dikes in a package of predominantly sedimentary rocks of the Upper Triassic Stuhini Group. The southern contact of the Limpoke Pluton (Texas Creek Plutonic Suite) is at or near the Jimmie zone. The pluton is a two-phase stock with a biotite hornblende quartz monzonite outer phase and medium-grained hornblende monozodiorite inner phase. Leucocratic potassium feldspar megacrystic syenite dikes intrude the borders of the pluton and surrounding Stuhini rocks. Gossanous fault structures oriented northeast-southwest contained anomalous gold and strongly anomalous arsenic values.
A major, post-intrusive, shear structure, known as the 'Goat' fault, is followed for more than 4 kilometes westwards from the Jimmie Creek zone. It is accompanied by local brecciation and by strong quartz-carbonate alteration, both of which were “exhaustively sampled” by Integrated Resources with poor results.
In 1990, the Jimmie-E1 Zone was described by Integrated Resources as being located on the ridge between Spann and Jimmie creeks, on the Goat 9 claim (Assessment Report 20988). This zone consisted of a 25 metre exposure of a north-trending, 2.0 metre wide, banded, polymetallic quartz-carbonate vein-system cutting hornfelsed sediments (greywacke). Sulphides account for up to 10 per cent of individual veins. As in the other nearby mineral occurrences, an auriferous syenite dike is in close proximity. The presence of anomalous concentrations of gold (0.7 grams per tonne gold), silver {to 24.6 grams per tonne) and zinc (to greater than 1 per cent) over widths of up to 2 metres have occurred.
The Jimmie-E2 Zone, also on the Goat 9 about 600 metres east of the Jimmie E1 Zone, is underlain by a volcanic sequence comprised of rhyolite and andesite tuffs and feldspar porphyry through which cuts pronounced northwest faulting. Quartz-sericlte-clay-pyrite alteration is well developed within both the fault and feldspar porphyry. The signature of this target is a very high silver background: 10.4 to 26.7 grams per tonne derived mostly from feidspar porahyry and andesite (Assessment Report 20988).
Work History
The area was originally explored by Teck Explorations and Dupont in the early 1980’s, with work centering on the Tuff and New Limpoke occurrences (MINFILE 104G 121 and 104G 024). Between 1988 and 1992, Integrated Resources explored the area as the Goat and IR claims and completed programs of geochemical sampling, geophysical surveys, geological mapping on various zones and showings. Integrated worked on the Jimmie in 1989 and 1990. In 2002, Newcastle Resources and Viceroy Resources staked the area as a part of the Target 1-4 claims and completed a prospecting program.
See Ridge (104G 208) for details of a common work history and for results of an airborne magnetic and radiomagnetic which covered the Jimmie area.
In 2019 and 2020, Libero Copper and Gold Corp. completed programs of geological mapping; geochemical (rock, soil and talus fines) sampling; a 549 line-kilometre airborne electromagnetic (ZTEM) survey; three diamond drill holes, totalling 610.0 metres, and 24 reverse-circulation drill holes, totalling 3527.5 metres, on the area as the Big Red property.
