The Triple area is underlain by Devonian metadsedimentary and metavolcanic rocks of the Stikine Assemblage. The Devonian Forrest Kerr Pluton is in contact the immediate west of the Stikine rock. Plutonic rocks consist primarily of Late Devonian granite and diorite.
The Triple Creek, Creek, Barry’s Cliff and Canyon Shear zones occur in the same vicinity within a few hundred metres. (Assessment Report 24156, Figure 5). These showings exposed along precipitous cliffs on the south side of Gossan Creek occur within an extensive unit of andesites (Figure 6). They comprise northerly striking, subvertical to gently dipping arsenopyrite bearing quartz veins that have been cut by northeasterly striking, subvertical shear zones displaying pervasive Fe-carbonate alteration accompanied by impressive chalcopyrite mineralization. Late northeasterly striking, south dipping faults displace the quartz veins dextrally while later, steeply dipping northerly faults, possibly related to the West Slope fault zone, down throw the stratigraphy to the east.
In 1990, Avondale Resource drilled nine holes were drilled from three platforms constructed in this area of very steep to extreme relief. In 1995, Meridian Peak Resource tested the Triple Creek, Creek, Barry's Cliff and Canyon Shear showings on Forrest 3 with drillholes F95-4 to 11.
The Creek Shear showing was first discovered in 1988 along with the nearby Triple Creek and Canyon Shear occurrences while prospecting the steep bluffs located on the south side of Gossan Creek. The gold-copper showing was hand trenched in 1989 and returned results of 4.18 grams per tonne gold over 1.0 metre. The showing was exposed by trenching over about 30 metres and consisted mainly of chalcopyrite mineralization occupying a narrow shear and breccia zone trending 040 degrees and dipping sub vertically. A few other chalcopyrite and arsenopyrite-bearing veins found in the showing area led to a possible strike length of the zone of 150 metre. Assays of trench samples from the Creek Fe carbonate shear yielded values of up to 4.8 grams per tonne gold and 6.77 per cent copper across 0.25 metre. Drill hole AVD 90-13 intersected a copper rich quartz breccia, below the trench, grading 4.46 grams per tonne gold and 0.64 per cent copper over 16 metres (Assessment Report 20562).
The Triple Creek showing is exposed in a small draw approximately 100 metres west and 15 metres vertically below the nearby Creek Showing. Previous sampling of the northwest trending, arsenopyrite rich quartz veins yielded very significant gold values. Panel sampling at the Triple Creek (1989) consistently yielded values of 3.4 to 20.6 grams per tonne gold over 0.5 metre from arsenical quartz veins (Assessment Report 24156). In 1990, Avondale drilled three holes to the southwest from a single drill platform with disappointing results.
In 1995, drillhole F95-11 drilled in an easterly direction was also intended to test from the northerly extension of Triple Creek veins as well as test the Creek showing to depth. Assays from 60.85 to 64.0 metres averaged 4.04 grams per tonne gold over 3.15 metres (Assessment Report 24156). A partly brecciated quartz-carbonate vein between 146.3 and 147.5 metres contains 0.2 metre of patchy chalcopyrite. Sample 57467 assayed 905 parts per billion Au, 27 grams per tonne silver and 5.59 per cent copper over 0.45 metre (Assessment Report 24156).
The Canyon Shear showing is located approximately 300 metres east of the Creek showing and shares a similar history (Figure 67). The showing is located in a prominent northeast trending fault system as expressed on surface as a deep, extremely steep-walled canyon. Mineralization consists mainly of oxidized shear material with minor malachite and azurite.
Drill Hole F95-8, collared above Barry's Cliff and drilled northwesterly toward the Creek Zone, intersected several zones of interest. Between 145 and 160 metres numerous quartz and quartz-carbonate veins contain traces of chalcopyrite, arsenopyrite and pyrite. Sample 57420 at 211 metres and containing a 12 centimetres quartz-chlorite vein with arsenopyrite, reported values of 10.6 grams per tonne gold and less than 1 per cent arsenic over 0.5 metre (Assessment Report 24156).
See Forrest (104B 380) for a common work history pertaining to all Forrest property showings.
