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Porphyry system extended to surface and depth at Trundle Park

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Porphyry system extended to surface and depth at Trundle Park

 

 

 

 

 

  • Assay results for TRDD014W1 return significant higher gold grade skarn intervals and broad intervals of porphyry style intrusions at the Trundle Park prospect;
    • 42m @ 0.42 g/t gold and 0.12% copper from 358m, including:
      • 10m @ 1.13 g/t gold and 0.32% copper from 382m
    • 48m @ 0.19 g/t gold and 0.03% copper from 458m
    • 122m @ 0.16g/t gold and 0.03% copper from 596m
    • 10m @ 0.21g/t gold and 0.06% copper from 750m
    • 16m @ 0.11g/t gold and 0.07% copper from 860m
  • For the first time at the Trundle Park prospect most recently completed hole TRDD028 intersected broad porphyry style intrusions from near surface (to 467m), with the targeted deeper intrusive body also intersected (assay results pending);
  • Assay results for TRDD022 (162m @ 0.24 g/t gold and 0.04% copper, including 18m @ 0.75 g/t gold and 0.09% copper), TRDD014/W1 and visual interpretation of TRDD028 provided further confidence of proximity to the core of a large porphyry intrusive system, vectors for follow up drilling and support the working model of a vertically extensive mineralized intrusive system that has both open pit and underground target potential;
  • Hole TRDD029 has commenced testing nearer surface intrusive potential, and also western and southern strike for both skarn and porphyry type intrusion mineralization at depth.

 

Kincora Copper Limited (TSX-V: KCC) (ASX: KCC) is pleased to provide an exploration update from ongoing drilling at Trundle Park prospect situated at the brownfield Trundle project, located in the Macquarie Arc of the Lachlan Fold Belt in NSW, Australia.

 

John Holliday, Technical Committee chair, and Peter Leaman, VP of Exploration, noted:

“The occurrence of the targeted porphyry intrusive system from surface to depth in TRDD028 (assay results pending) provides a new nearer surface and potentially open pit target in addition to the known deeper parts of the system at the Trundle Park prospect. This is a very positive development and consistent with a number of the vertically extensive intrusive deposits at Northparkes that extend from nearer surface to depth.

Assay results for TRDD014W1 confirmed our initial visual interpretations with broad intrusive intervals and higher-grade skarn zones. The widths of mineralised intervals returned in TRRD014W1 and visual intrusions in TRDD028 are very encouraging. 

We continue to see the right rocks and alteration in what is an increasingly large intrusive system. The recently commenced hole TRDD029 will test the nearer surface intrusive, and southern and western depth potential, with the west and south still open for further follow up drilling as we seek to intersect the higher grade and inner potassic core of the intrusive system.”

 

Figure 1: Assay results pending for both the Trundle and Fairholme projects

  • Favourable locations of the key porphyry belts of the Macquarie Arc
  • Advance stage exploration projects with demonstrated large scale mineralised systems
  • Hallmarks to neighbouring world-class deposits

 

Figure 2: Trundle is the only brownfield porphyry project held by a listed junior in the Lachlan Fold Belt (LFB), located within Northparkes Igneous Complex which already hosts the 2nd largest porphyry mine in Australia (endowment 5.5Moz Au & 4.5Mt Cu1)

  • Large geochemical footprints with a cluster of concealed intrusive deposits at Northparkes
1 Bespoke March 2020 report by Richard Schodde, MinEx Consulting, for Kincora

 

Trundle Park prospect

 

Recent drilling at the Trundle Park prospect has confirmed a significant area and multiple intrusive porphyry system with a mineralised zone emerging. The latest hole (TRDD028) now also demonstrates nearer surface potential for a multiple intrusive system (assay results pending).

 

These results provided further confidence of proximity to the core of a porphyry intrusive system such as the multiple deposits at the neighbouring Northparkes mine or at Cadia-Ridgeway – where Figure 1 outlines our target model – and supports the working geological concept of a vertically extensive mineralized intrusive system that has both open pit and underground target potential.

 

Figure 3: The clusters of deposits at the neighbouring Northparkes mine and at Cadia-Ridgeway exhibit multiple intrusive systems and an alteration, lithology and mineralised setting not dissimilar to the Trundle Park prospect around discrete mineralized cores of only hundreds of metres width that are vertically extensive

 

Assay results have been received for TRDD014W1 that intersected significant higher gold grade skarn intervals and broad intervals of porphyry style intrusions. Highlights include:

 

  • 42m @ 0.42 g/t gold and 0.12% copper from 358m, including:
    • 10m @ 1.13 g/t gold and 0.32% copper from 382m
  • 48m @ 0.19 g/t gold and 0.03% copper from 458m
  • 122m @ 0.16g/t gold and 0.03% copper from 596m
  • 10m @ 0.21g/t gold and 0.06% copper from 750m
  • 16m @ 0.11g/t gold and 0.07% copper from 860m

 

Further details and significant intervals are included in Table 1 and see Figure 4 (c) for a cross section.

 

This hole was a wedge drilling off previous hole TRDD014, seeking to extend the original hole to greater depth and provide coverage towards TRDD022. TRDD014W1 has confirmed, expanded and returned higher grade skarn intervals, and extended the intrusive systems returned in both TRDD014 and TRDD022 to depth and on strike.

 

Assay results for TRDD014W1 confirmed our initial visual interpretations with broad intrusive intervals and higher-grade skarn zones, and the widths of and multiple intervals returned are very encouraging.

 

The lithologies, alteration, veining, mineral tenor and structural interpretations have provided further confidence of a proximal environment to the targeted causative intrusion at the Trundle Park prospect, as well as vectors for follow up drilling.

 

Initial follow up hole TRDD028 was drilled parallel and west of TRDD014/W1, and further expanded the deeper intrusive system to the west but importantly also intersected a broad and nearest to surface intrusive system identified to date at the prospect.

 

Figure 4: Recently completed TRDD028 has intersected broad intervals of the targeted intrusive system nearer surface than previously recognized at the Trundle Park prospect and expanded the system to depth and the west of previous drilling.

 

Recently commenced follow up hole TRDD029 is further testing the nearer surface and deeper intrusive system to the west and south.

 

(a) Plan view of Trundle Park prospect and planned hole TRDD029 – see Figure 3 (b) for section

(b) Working Leapfrog model and design of hole TRDD029 – Trundle Park prospect section

(Section line through Figure 3 (a). Length ~900m and width ~1000m, ~400m to the NNE with only the trace of TRDD029 and TRDD017 to the SSE)

(c) Insert with mineralised intervals and illustration of strike/down dip target of TRDD029, noting the distance from TRDD029 to TRDD028 is ~150m and 95m west to TRDD014/17

(Length ~700m and width ~420m)

 

Table 1: Trundle Park target hole TRDD014W1 – Significant broad mineralized intervals

 

Porphyry gold and copper intercepts are calculated using a lower cut of 0.10g/t and 0.05% respectively.
Internal dilution is below cut off; and, * Dilutions related with Core loss

 

From initial logging of TRDD028 notable zones include (with assay results pending):

  1. Upper intrusions (surface – 467m): a weathered monzodiorite intrusion was intersected from surface to 39m down-hole followed by a short interval of volcanoclastic sandstones and siltstones to 69m. A broad upper interval of monzodiorite was then intersected to 467.3m, which was in-turn intruded in multiple zones by red (interpreted potassic altered) monzonite dyke-like bodies (<2 and >10m wide). Quartz-sulphide veins were also observed in the monzonite dykes. See Figure 6 (a) and (b) for examples of core from this zone.
  2. Skarn altered volcanoclastic rocks (467 – 741m): a volcanoclastic dominated sequence (mainly grey sandstones and siltstones) was intersected with multiple intervals of zoned skarn alteration spaced approximately 100m apart and occurring close by to intrusion contacts. In the upper (retrograde) skarn two cavities were observed comprising green garnet-carbonate-epidote-magnetite-pyrite and minor chalcopyrite and trace bornite – see Figure 6 (c).
  3. Lower intrusions (741  – 868.3m): A broad lower interval of monzodiorite was intersected, with similarities to those observed in TRDD014W1. Comparatively, to the upper zone, this larger monzodiorite intrusion is cut by two zones (smaller) of red monzonite intrusions. See Figure 6 (d).
  4. Thrust fault with a slice of volcanoclastic sequence then conglomerate (868 –  879m): the interpreted regionally significant westerly dipping thrust fault (the Tullamore thrust) was intersected in close proximity to the forecast depth at 870m and defined by sheared red clays to 873m down-hole, followed by a preserved slice of a sheared volcanoclastic sequence +/- pyrite intersected from 873-878.8m. A dark red conglomerate unit with fragments of grits, shale and rounded pebble sized felsic intrusive rock clasts was observed between 878.8-879.4m to end of hole and is interpreted to be similar to those observed at the end of in hole TRDD015 and considered to be Devonian aged.

 

See Figure 6 for examples of the described rock types in TRDD028 and interpreted section for TRDD028 below.

 

Figure 5: The occurrence of the targeted preserved porphyry intrusive systems from surface to depth in TRDD028 (assay results pending) provides a new nearer surface and potentially open pit target in addition to the ongoing deeper parts of the system at the Trundle Park prospect

 

Key observations include: the multiple phase, multiple intrusive setting returned in TRDD022 (162m @ 0.24 g/t gold and 0.04% copper, including 18m @ 0.75 g/t gold and 0.09% copper), TRDD026 and TRDD014/W1, endoskarn intersected in TRDD014W1, TRDD028 coupled with returned mineral tenor in TRDD022, TRDD014/W1 and TRDD001 (21.1m @ 0.25 g/t gold and 0.03% copper to EOH), and provides indicators of a proximal environment to the targeted core of an intrusive porphyry system and vectors for follow up drill testing.

 

A recently commenced hole (TRDD029) is an offset scissor hole stepping out to the west of TRDD028 drilling towards the south-southeast testing for nearer surface porphyry type intrusive potential, and the western and southern strike coverage for both skarn and porphyry mineralization at depth.

 

The west and south remain open for further follow up drilling within an identified mineralized corridor. The Company is also reviewing previous air-core drilling that have returned shallow intrusions (generally at less than 20m vertical depth from surface), and may warrant infill coverage to assist advance a shallow, open pit intrusive system target.

 

Figure 6: Examples of the rock types in hole TRDD028 at the Trundle Park prospect

 

(a) Monzodiorite – Upper interval example from 389m with increasing K-spar (interpreted potassic) alteration (reddening) along quartz-carbonate-pyrite veins (inset photo).

(b) Red monzonite (interpreted potassic alteration) cut by quartz-pyrite veins, then in turn by carbonate veins (inset @ 402.8m).

(c) Basaltic andesite lava host rock with a cavity filled by retrograde skarn comprising green garnet-carbonate-epidote-magnetite-pyrite, minor chalcopyrite and trace bornite (purple).

(d) Monzodiorite (grey-brown) – Lower interval example from 793m with increasing dykes of (interpreted potassic altered) monzonite (red).

 

Photos of selected intervals which are not representative of the mineralization hosted on the whole property or Trundle Park prospect but are of the alteration and lithology’s intersected in the mineralized zones in these sections of drill holes TRDD028, and current working geological interpretation presented in Figure 3. There is insufficient drilling data to date to demonstrate continuity of mineralized domains and determine the relationship between mineralization widths and intercept lengths. True widths are not known.

 

Trundle Project background

The Trundle Project includes one single license covering 167km2 and was secured by Kincora in the March 2020 agreement with RareX Limited (“REE” on the ASX). Kincora is the operator, holds a 65% interest in the Trundle Project and is the sole funder until a positive scoping study is delivered at which time a fund or dilute joint venture will be formed.

 

Posted December 7, 2021

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