The Princeton Project features characteristics of alkalic porphyries, including, but not limited to:- A large cluster (property-wide), or multiple small clusters (i.e.,
Whipsaw Creek ,Fourteen Mile Creek –Lamont Ridge ) of small diorite to gabbro porphyry intrusive bodies; - Areally small intrusive exposures;
- Broadly coeval
Nicola Group host rocks; - Associated structural complexity;
- Accompanying selective to pervasive porphyry-style (although low temperature) alteration; and
- Cu-Au ± Ag, with limited accompanying Mo mineralization.
- A large cluster (property-wide), or multiple small clusters (i.e.,
- Work in the
Ridgeway – Cadia area, together with comparisons to alkalic deposits in BC has reinforced the interpreted significance of the iron carbonate – silica alteration recognized in Fourteen and Fifteen Mile creeks. - The close spatial association of elevated to highly anomalous Cu - Au - Ag - Ca - K with the high intensity Condor Chargeability anomaly may indicate proximity to underlying, potentially high-grade copper mineralized porphyry intrusion.
Two porphyry belts have been identified in
Highlights
There are several significant interpretations arising from this technical summary of characteristic features of alkalic porphyry deposits in
- Work in the
Ridgeway – Cadia area, together with comparisons to alkalic deposits inBritish Columbia has reinforced the interpreted significance of the iron carbonate – silica alteration recognized in Fourteen and Fifteen Mile creeks (Note: iron carbonates include dolomite and ankerite). The spatial association of this alteration with a small exposure of diorite is interpreted to indicate the diorite is the causative source of the alteration and may be indicative of alkalic epithermal-style alteration inBritish Columbia . - By comparison with
Ridgeway , a large envelope of low-grade pyrite mineralization may be another indication of alkalic epithermal-style alteration, despite there being little or no accompanying copper mineralization. - “Reddening”, or hematite (i.e., iron) alteration, in the
Inner Propylitic Alteration Zone , may indicate proximity (i.e., within 200 meters vertically) to underlying, potentially ore grade copper mineralization. - Zones of pervasive albite - chlorite - pyrite (i.e., sodic) alteration may indicate proximity (i.e., within 500 meters vertically and/or laterally) to potentially ore grade copper mineralization.
- Rare to minor, narrow copper-bearing veinlets might escape the core, and extend for several hundred meters beyond, the mineralized porphyry.
To further evaluate several interpreted porphyry occurrences, the Company has submitted a Notice of Work permit application necessary to conduct multiple IP surveys, comprising up to 30 line km, on targets located in the
Geological Description
Figure 1 – Map showing two porphyry belts identified in
The following has been modified slightly from Lang et al. (1995)1:
The alkaline (or alkalic) suite of porphyry deposits is represented by a comparatively small subgroup (of porphyry deposits) temporally restricted to the Early Mesozoic Quesnel and Stikine terranes in
- An association with alkalic igneous rocks;
- A metal assemblage of Cu-Au-Ag with no significant Mo; and
- Distinctive alteration, including assemblages characterized by Na- and Ca- bearing minerals, accompanied by magnetite-rich potassic alteration and typical propylitic alteration, with a near-absence of sericitic, argillic and advanced argillic assemblages.
- Alkalic igneous rocks that typically either lack, or have very minor, normative quartz or feldspathoid, and only rarely contain very minor modal quartz (usually restricted to late-stage intrusions);
- Diorite/gabbro to monzonite compositions only rarely accompanied by minor pyroxenite and syenite;
- Equigranular to porphyritic igneous textures; and
- Associated volcanic rocks of the … Nicola Groups that are augite-phyric and mafic to intermediate in composition.
The Project features characteristic of alkalic porphyries, including, but not limited to:
- A large cluster (property-wide), or multiple small clusters (i.e.,
Whipsaw Creek ,Fourteen Mile Creek –Lamont Ridge ) of small diorite to gabbro porphyry intrusive bodies; - Areally small intrusive exposures;
- Broadly coeval
Nicola Group host rocks; - Associated structural complexity;
- Accompanying selective to pervasive porphyry-style (although low temperature) alteration; and
- Cu-Au ± Ag, with limited accompanying Mo mineralization.
Arguably, the most pertinent difference between the Project (and other alkalic-type exploration projects) with respect to alkalic deposits identified in
Recent work completed on alkalic deposits identified in
The epithermal zone associated with the
The propylitic alteration system outboard of the potassic core of the porphyry system has been sub-divided into Inner and Outer Propylitic zones, as follows:
- Inner Propylitic - (chlorite – hematite ± magnetite – actinolite)
- hematite with minor preserved magnetite, distinct reddening
- Outer Propylitic - (chlorite – epidote – calcite -albite ± pyrite)
Figure 2 - West – East Geological Cross Section (looking North) of
Figure 3 – Hypothetical cross section through an alkalic porphyry to the overlying epithermal zone. Interpreted average level of erosion in identified
Another feature pertinent to the Project (and alkalic exploration projects in general) is that phyllic alteration (sericite – illite) is present, however it is structurally controlled (as veins and veinlets) rather than present as a huge blanket of alteration. To put this in context for the Project:
- at surface at the Kodiak Property, the AXE MINFILE occurrence has “… a cap of propylitic alteration with minor sericite approximately 150 m above porphyry apices”1.
- At the Katie Property, in the upper zones and in shallow drilling, there is massive albite - pyrite alteration with minor amounts of sericite above the apex of the causative intrusion, associated with albite, minor sericite and shallow potassic alteration1.
- At
Mount Milligan , a dolomite – ankerite – sericite – alkali feldspar – albite alteration cap is partially preserved in the 66 Zone, interpreted as a remnant of a “carbonate – phyllic” overprint1.
Note: carbonate is much more common in
One interpretation forwarded to explain this missing feature in
In addition, the close spatial association of elevated to highly anomalous Cu – Au - Ag - Ca (as potential secondary carbonate) and K with the high intensity Condor Chargeability anomaly may indicate proximity to underlying, potentially high-grade copper mineralization associated with a subsurface (i.e., “blind”) porphyry intrusion.
Qualified Person
This news release has been reviewed and approved by
The information disclosed is not necessarily indicative of mineralization on the Project.
References
1 - Lang,
2 - Gleeson, K., Newcombe, G, Griffin, P and Stephenson, P. 2020. Cadia Operations,
3 - Wilson, A. 2021. Tops of alkalic Au-Cu porphyry systems: Exploration challenge & opportunity –
4 - Saleken, L.W., 2013. Compilation Assessment Report on the Tulameen Project Mineral Property, Similkameen Mining Division, BC Geological Survey Assessment Report 33626a.
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Figure 1
Map showing two porphyry belts identified in British Columbia ; one hosted within the Quesnellia terrane (QN) and a second within the Stikinia terrane (ST). (From Bissig and Cooke 2014).
Figure 2
West – East Geological Cross Section (looking North) of Ridgeway – Cadia deposit area. Note: the entire section is underlain by the igneous complex (Gleeson et al 2020).
Figure 3
Hypothetical cross section through an alkalic porphyry to the overlying epithermal zone. Interpreted average level of erosion in identified British Columbia alkalic deposits indicated by thick dashed line. (From Wilson 2021).
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