Pacific Ridge’s Inaugural Drill Program Returns Some Of The Best Drill Results Ever Recorded At The Chuchi Copper-Gold Project
| Drill hole | From (m) | To (m) | Width (m) | Cu (%) | Au (g/t) | Ag (g/t) | CuEq (%) 1 | AuEq (g/t) 2 |
| CH-91-42 | 91.4 | 320.6 Ɨ | 229.2 | 0.10 | 0.61 | NA | 0.51 | 0.76 |
| CH-24-070 | 59.0 | 479.9 | 420.9 | 0.15 | 0.15 | 0.43 | 0.26 | 0.38 |
| CH-24-073 | 143.0 | 525.0 | 382.0 | 0.19 | 0.12 | 0.47 | 0.27 | 0.41 |
| CH-24-072 | 7.0 | 481.0 | 474.0 | 0.12 | 0.12 | 0.56 | 0.21 | 0.31 |
| CH-24-074 | 49.8 | 348.0 Ɨ | 298.2 | 0.21 | 0.11 | 0.51 | 0.29 | 0.43 |
| CH-90-27 | 24.0 | 288.0 | 264.0 | 0.18 | 0.18 | 0.68 | 0.31 | 0.45 |
| CH-90-33 | 39.6 | 304.5 Ɨ | 264.9 | 0.20 | 0.12 | 0.44 | 0.29 | 0.42 |
| CH-90-37 | 54.3 | 262.1 Ɨ | 207.8 | 0.22 | 0.12 | 0.56 | 0.31 | 0.45 |
| CH-91-40 | 46.0 | 203.6 | 157.6 | 0.21 | 0.19 | NA | 0.34 | 0.50 |
| CH-89-07 | 38.0 | 138.0 | 100.0 | 0.27 | 0.34 | 1.31 | 0.51 | 0.76 |
Table 2
2024 Chuchi Drilling Results
| Hole No. | From (m) | To (m) | Width (m) | Cu (%) | Au (g/t) | Ag (g/t) | CuEq (%) 1 | AuEq (g/t) 2 |
| CH-24-070 | 66.0 | 479.9 | 413.9 | 0.15 | 0.15 | 0.43 | 0.26 | 0.38 |
| includes | 66.0 | 169.0 | 103.0 | 0.19 | 0.20 | 0.61 | 0.32 | 0.48 |
| and | 358.0 | 459.0 | 101.0 | 0.19 | 0.16 | 0.39 | 0.30 | 0.45 |
| CH-24-071 | 54.0 | 172.0 | 118.0 | 0.17 | 0.17 | 0.57 | 0.28 | 0.42 |
| includes | 107.0 | 129.0 | 22.0 | 0.26 | 0.22 | 0.91 | 0.41 | 0.61 |
| CH-24-072 | 7.0 | 481.0 | 474.0 | 0.12 | 0.12 | 0.56 | 0.21 | 0.31 |
| includes | 7.0 | 77.0 | 70.0 | 0.15 | 0.14 | 0.73 | 0.25 | 0.36 |
| and | 198.0 | 234.0 | 36.0 | 0.26 | 0.32 | 1.26 | 0.48 | 0.72 |
| and | 411.0 | 481.0 | 70.0 | 0.16 | 0.14 | 0.64 | 0.26 | 0.38 |
| CH-24-073 | 143.0 | 525.0 | 382.0 | 0.19 | 0.12 | 0.47 | 0.27 | 0.41 |
| includes | 143.0 | 243.0 | 100.0 | 0.26 | 0.14 | 0.58 | 0.36 | 0.54 |
| includes | 143.0 | 208.0 | 65.0 | 0.31 | 0.16 | 0.69 | 0.42 | 0.63 |
| and | 425.0 | 525.0 | 100.0 | 0.25 | 0.16 | 0.66 | 0.37 | 0.54 |
| CH-24-074 | 49.8 | 348.0 Ɨ | 298.2 | 0.21 | 0.11 | 0.51 | 0.29 | 0.43 |
| includes | 49.8 | 171.0 | 121.2 | 0.23 | 0.08 | 0.55 | 0.29 | 0.42 |
| and | 189.0 | 348.0 Ɨ | 159.0 | 0.21 | 0.14 | 0.49 | 0.31 | 0.45 |
| includes | 297.0 | 348.0 Ɨ | 51.0 | 0.22 | 0.15 | 0.49 | 0.33 | 0.48 |
1CuEq = ((Cu%) x $Cu x 22.0462) + (Au(g/t) x AuR/CuR x $Au x 0.032151) + (Ag(g/t) x AgR/CuR x $Ag x 0.032151)) / ($Cu x 22.0462).
2AuEq = ((Au(g/t) x $Au x 0.032151) + ((Cu%) x CuR/AuR x $Cu x 22.0462) + (Ag(g/t) x AgR/CuR x $Ag x 0.032151)) / ($Au x 0.032151).
Commodity prices: $Cu = US$3.25/lb, $Au = US$1,800/oz., and Ag = US$20.00/oz.
NA = not analyzed
Ɨ End of hole
There has been no metallurgical testing on Chuchi mineralization. The Company estimates copper recoveries (CuR) of 84%, gold recoveries (AuR) of 70% and silver recoveries (AgR) of 65% based on the average recoveries from Kemess Underground, Mount Milligan, and Red Chris.
Factors: 22.0462 = Cu% to lbs per tonne and 0.032151 = Au g/t to troy oz per tonne.
Sources include: Chuchi project historical drilling database; also reported in BC Geological Survey (Branch) Assessment Reports 20018 (CH-89-7), 21113 (CH-90-27, CH-90-33, CH-90-37), unpublished Placer Dome Inc. database (CH-91-40, CH-91-42). The Company has not independently validated all historic work, and the reader is cautioned about its accuracy.
Figure 1
Location of Chuchi and Pacific Ridge’s Other Copper-Gold Porphyry Projects
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Figure 2
Six-Kilometre-Long Porphyry Trend, From Coho to Klaw Zone, at Chuchi
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Figure 3
Interpretation of BPZ-Digger Porphyry System at Chuchi, Looking Southward
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2024 Chuchi Drilling Program Results
Pacific Ridge completed 2,716 m in five diamond drill holes over a 750 m strike length across BPZ (see Figures 4 and 5). The program was designed to test areas of best historical drilling results for copper (“Cu”) and gold (“Au”) to determine their accuracy; and to test an updated exploration model for BPZ based on combined 3D geophysical inversion models (ZTEM and IP), a CuEq1 grade shell model of historical drilling, and compiled historical work.
Four of the five drill holes are among the best-ever recorded at Chuchi, which suggests that historical drilling results are reliable and that there is greater continuity of mineralization across BPZ than previously known. The best-ever drilling result from CH-91-42 (See Table 1) appears to have drilled epithermal gold style mineralization in a lithocap root zone (see Upper Part of a Porphyry System section below).
The program revealed there are two porphyritic stocks, one in BPZ and another farther northeast in Digger Zone (see Figure 3). Both are open laterally and at depth, and the Company believes these represent the upper part of a large porphyry copper-gold system. Sulfide (chalcopyrite-pyrite) mineralization appears to dip moderately-steeply westward, following a NE-trending corridor centered on the North Central (“NC”) fault zone (see Figures 3 and 4), particularly on its western side. Faulted, brecciated and calc-potassic altered lithological contact zones at the margin of porphyry stocks were identified as areas of strongest mineralization.
Drill hole CH-24-070 encountered the deepest mineralization to date at 420 m vertical depth, with 101 m of 0.30% CuEq 1 and 0.45 g/t AuEq2 (0.19% Cu, 0.16 g/t Au, and 0.39 g/t Ag) from 358.0-459.0 m (see Table 2). It was drilled steeply to the east, resulting in drilling out of the west-dipping BPZ stock mineralization halo at depth, helping to confirm the west dip of mineralization. The previous deepest drilled copper-gold mineralization was in CH-19-0003 at 390 m vertical depth in Digger Zone.
CH-24-072 encountered copper-gold mineralization at 250 m greater depth than pre-existing proximal drill holes (Figure 5), extending the grade shell in southwestern BPZ. Both CH-24-070 and CH-24-072 indicate that BPZ stock is mineralized throughout, returning long runs of breccia-hosted porphyry mineralization including 413.9 m of 0.26% CuEq1 and 0.38 g/t AuEq2 in CH-24-070 and 474.0 m of 0.21% CuEq1 and 0.31 g/t AuEq2 in CH-24-072 (see Table 2). CH-24-073 indicates BPZ stock copper-gold mineralization halo continues into the stock footwall and a magnetite breccia zone.
The last hole of the program, CH-24-074, was drilled near the interpreted centre of the system, based on the preceding holes and historical drilling grade shell model (see Figure 3), and was shut down in mineralization at 348 m due to budgetary constraints. The bottom 51.0 m returned 0.33% CuEq1or 0.48 g/t AuEq2 (0.22% Cu, 0.15 g/t Au, and 0.49 g/t Ag) within 298.2 m of 0.29% CuEq 1 or 0.43 g/t AuEq2 (0.21% Cu, 0.11 g/t Au, and 0.51 g/t Ag). The subtle increase in copper-gold grade with depth, metal ratio signature (Au:Cu 0.70 and Ag:Cu 2.5) and highest MPIx value of 10.05, may provide a vector towards a porphyry core.
Figure 4
2024 BPZ Drill Holes in Plan View With 3D ZTEM Model in Background
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Figure 5
2024 Chuchi Drilling With 3D ZTEM Model in Background (550 m Wide Slice) and TMI Magnetics on Surface
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Two Porphyry Stocks
Results of the 2024 Chuchi drilling program suggest there are two porphyry stocks: a composite monzodiorite porphyry in BPZ and a monzonite porphyry in Digger Zone. These two porphyry centres are separated by ~500 m along a northeast trend defined by the NC Fault corridor. The BPZ monzodiorite stock spatially coincides with a 550 m (E-W) x 500 m (N-S) x 600 m (depth) ZTEM conductivity low feature that dips moderately-steeply (60°) to the southwest. The Digger monzonite stock is nearly masked by conductors in the geophysical models but was intersected for 57 m at the end of CH-24-073 and appears to be ~200 m wide in the DC resistivity model with similar dip orientation as the BPZ stock (see Figure 3). The copper-gold mineralized halos around these porphyry stocks are 100 m wide with nearly identical weighted average grades of 0.36-0.37% CuEq1 and 0.54 g/t AuEq2, as approximated by CH-24-073 (see Table 2) which drilled to the northeast from BPZ porphyry into the Digger porphyry at depth.
Upper Part of a Porphyry System
Relogging of historical drill hole CH-91-42, which returned 229.2 m of 0.10% Cu and 0.61 g/t Au starting from 91.4 m (see Table 1), indicates a monzonite porphyry host rock similar to that encountered at greater depth in CH-24-073 (see Figure 3). It is strongly quartz-sericite-clay-calcite altered with a bleached appearance. Straight-walled quartz-pyrite veins and breccia returned grades up to 25.1 g/t Au (112-114 m) within 50 m of 0.09% Cu and 2.10 g/t Au from 94.0 m. The interpretation from relogging is that this represents a lithocap root zone. The down-plunge distance from this lithocap root to the Digger porphyry mineralization drilled in CH-24-073 is 280 m. If lithocap root zones are generally ~1 km above the porphyry core as suggested by the Sillitoe model for a telescoped porphyry copper system (2010), then the widespread copper-gold mineralization at Chuchi would represent the upper part of the porphyry system. Deepest drilling to date is to ~530 m vertical depth below surface in CH-24-070 and CH-24-071.
This evidence aligns with the interpretation that BPZ-Digger, being hosted in Early Jurassic volcano-sedimentary rocks of the Chuchi Lake succession, is several 100 m above the unconformable contact with Late Triassic volcanic rocks of the Takla Group (Witch Lake succession) and the best stratigraphic location for a porphyry core. This uses the nearby Mount Milligan porphyry Cu-Au deposit as an analogue, which is hosted in the Witch Lake succession rocks.
About Chuchi
Chuchi is over 160 km2 in size and comprises three mineral tenure blocks, Chuchi, under option from a subsidiary of Centerra, and Chuchi South and Chuchi West, under option from American Copper Development Corporation (ACDX: TSXV) and a private individual. Chuchi is road accessible and is located 35 km northwest of Centerra’s Mount Milligan Mine. The Project has seen less than 15,360 metres (89 drill holes) of historical drilling to an average vertical depth of 140 m. Most of this drilling was completed in 1989-1991. Chuchi hosts several compelling exploration targets within a six-kilometre-long porphyry trend, including BPZ. The Company believes that Chuchi has significant untested potential for porphyry copper-gold mineralization at depth as many of the historic drill holes were shallow and ended in mineralization. Further, the porphyry core has yet to be identified.
QA/QC (Quality Assurance/Quality Control)
Pacific Ridge’s 2024 exploration program was managed by Equity Exploration Consultants Ltd. of Vancouver, B.C. The drill contractor was Dorado Drilling Ltd. of Vernon, B.C. Half-core NQ (47.6 mm) sawed samples from continuous intervals throughout the reported drill holes were sealed on site and shipped to ALS Global Laboratories (“ALS”) preparation lab in Terrace, BC or North Vancouver, BC. Fire assay and multielement analyses were completed at ALS Minerals analytical laboratory in North Vancouver. Drill core was crushed, pulverized and analyzed for 48 elements using a four-acid dissolution followed by ICP-MS (ME-MS61) with over limits by ore grade four-acid dissolution followed by ICP-AES (OG62), with a 30 g sample analyzed for gold by fire assay and atomic absorption finish (Au-AA23). Blanks and commercially certified reference materials were inserted blind into the sample stream with an overall insertion rate of 8%. Crush duplicates were inserted at 2.5%. Pulp and crush duplicates are inserted at 5% insertion rate by the laboratory. The QAQC results are reviewed as batches are returned from the laboratory and appropriate actions are implemented where required. The QA/QC results for the reported drill holes are acceptable.
About Pacific Ridge
Our goal is to become B.C.’s leading copper-gold exploration company. Pacific Ridge’s flagship asset is its 100% owned Kliyul copper-gold project, located in the Quesnel terrane close to existing infrastructure. In addition to Kliyul, the Company’s project portfolio also includes the Chuchi copper-gold project, the 100% owned RDP copper-gold project, the 100% owned Onjo copper-gold project, and the 100% owned Redton copper-gold project, all located in British Columbia. The Company would like to acknowledge that its B.C. projects are located in the traditional, ancestral and unceded territories of the Gitxsan Nation, McLeod Lake Indian Band, Nak’azdli Whut’en, Takla Nation, and Tsay Keh Dene Nation.
On behalf of the Board of Directors,
“Blaine Monaghan”
Blaine Monaghan
President & CEO
Pacific Ridge Exploration Ltd.
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The technical information contained within this News Release has been reviewed and approved by Danette Schwab, P.Geo., Vice President Exploration, and a Qualified Person as defined by National Instrument 43-101 policy.
Forward-Looking Information: This release includes certain statements that may be deemed “forward-looking statements”. All statements in this release, other than statements of historical facts, which address exploration drilling and other activities and events or developments that Pacific Ridge Exploration Ltd. (“Pacific Ridge”) expects to occur, are forward-looking statements. Although Pacific Ridge believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guarantees of future performance and actual results or developments may differ materially from those forward-looking statements. Factors that could cause actual results to differ materially from those in forward-looking statements include market prices, exploration successes, and continued availability of capital and financing and general economic, market or business conditions. These statements are based on a number of assumptions including, among other things, assumptions regarding general business and economic conditions, that one of the options will be exercised, the ability of Pacific Ridge and other parties to satisfy stock exchange and other regulatory requirements in a timely manner, the availability of financing for Pacific Ridge’s proposed programs on reasonable terms, and the ability of third party service providers to deliver services in a timely manner. Investors are cautioned that any such statements are not guarantees of future performance and actual results or developments may differ materially from those projected in the forward-looking statements. Pacific Ridge does not assume any obligation to update or revise its forward-looking statements, whether because of new information, future events or otherwise, except as required by applicable law.
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SOURCE: Pacific Ridge Exploration Ltd.
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