Aldebaran Resources Inc. (TSX-V: ALDE) (OTCQX: ADBRF) is pleased to report results from drill holes ALD-22-220 and ALD-22-221. The goal of both holes was to test for extensions of mineralization of the Altar Central and Altar East deposits. Hole ALD-22-220 tested for a south-western extension of Altar Central, while ALD-22-221 tested for mineralization in between Altar Central and Altar East in an area previously not drilled. In addition, ALD-22-221 also tested the northern edge of the very large 3D IP/MT geophysical anomaly recently reported by the Company (see news release dated June 13, 2022) however, the hole was started before the final geophysical data was received so it did not test the centre of the anomaly. Both holes successfully intercepted mineralization; ALD-22-221 intercepted a long run of mineralization indicating that the geophysical anomaly correlates well with mineralization, which opens a very large new area for additional exploration.
John Black, Chief Executive Officer of Aldebaran, commented as follows: “Hole 221 is very encouraging as it returned over a kilometer of mineralization in an area previously thought to be barren. Also, this hole provides a strong proof of concept that the 3D IP/MT geophysical targets correlate well with mineralization. Although this hole was started prior to receiving the geophysical data and didn’t centre punch the anomaly, it still provides confidence that where we drill the geophysical anomaly, we are likely to hit mineralization. Based on the size of the anomaly, this deposit has the potential to become much larger. Hole 220 also successfully expanded the footprint of Altar Central to the southwest and will require additional drilling to test the full extent of the mineralization. We look forward to getting back on site in the second half of 2022 to start drilling this sizeable geophysical anomaly from more strategic locations.”
Dr. Kevin B. Heather, Chief Geological Officer of Aldebaran, commented as follows: “Drill holes 220 and 221 confirm our long-held belief that the Altar system is much bigger than previously thought. The new 3D IP/MT geophysical anomaly correlates extremely well with the known mineralization that makes up the 2021 in-pit resource at both Altar Central and Altar East and also with mineralized drill holes that extend below and laterally away from that conceptual pit resource. Of particular interest, mineralization in 221 is hosted entirely within both favourable and historically less favourable wall rock units, suggesting the mineralizing source is nearby. Altar has the potential to become extremely large and we look forward to drilling additional holes into the untested portions of the geophysical anomaly.”
Table 1 below displays detailed assays results. Figure 1 displays a plan map with the location of the reported drill holes, and Figures 2, 3 and 4 display cross sections of the results of the holes reported herein.
|Table 1 – 2022 Altar Drill Hole Results|
|The grades are uncut. CuEq values were calculated using copper, gold, silver and molybdenum. Metal prices utilized for the calculations are Cu = US$3.00/lb, Au = US$1,400/oz, Ag = US$18/oz, and Mo = US$10/lb. No adjustments were made for recovery as the project is an early-stage exploration project and metallurgical data to allow for estimation of recoveries is not yet available. The formulas utilized to calculate equivalent values is CuEq % = Cu % + Au g/t * 0.6805 + Ag g/t * 0.00875 + Mo ppm / 3000.|
Discussion of Results:
Drillhole ALD-22-220 was drilled at -70 degree dip and an azimuth of 50 degrees to a final depth of 1,186.50 m. The purpose of the hole was to test for the extension of mineralization with a strong, multi-element geochemical anomaly with a NW-SE trend related to the Altar Central porphyry center. The hole intersected a mixed sequence of massive to fragmental andesitic volcanic rocks and, from 0 to 155 m depth and from 155 m to 480 m depth, a thick sequence of massive to fragmental rhyolitic volcanic rocks with possible crosscutting hypabyssal rhyolitic porphyry intrusions. From 480 m to 770 m, the hole once again encountered a mixed sequence of massive to fragmental andesitic volcanic rocks before entering a heterolithic magmatic-hydrothermal breccia from 770 m to 814 m. From 814 m until the end of the hole (1,186.50 m), the hole continued in the mixed sequence of massive to fragmental andesitic volcanic rocks.
This drillhole encountered strong epidote-chlorite-magnetite-hematite-pyrite alteration (i.e., propylitic assemblage) over the upper 155 m before entering a long run of strong sericite-pyrite-tourmaline-quartz-chalcopyrite alteration, associated with the occurrence of moderate copper mineralization. Starting at 815 m depth until the end of the hole, ALD-22-220 intersected moderate biotite-magnetite-potassium-feldspar alteration associated with weak quartz veining containing chalcopyrite and molybdenite. The alteration and mineralization encountered in this drill hole suggest that we have drilled into the outer portion of the system in the upper portion of the hole and progressively drilled back in towards the central portion of the Altar Central system.
Drillhole ALD-22-221 was drilled at a -80 degrees dip and an azimuth of 265 degrees to a final depth of 1487.50 m. The hole was drilled into a previously untested area located in between the known mineralization at Altar Central and Altar East. The only hole within a 200 m radius is ALD-07-024, which was drilled only to 445.8 m depth. Hole ALD-22-221 was collared and started before the receipt of the final 3D IP/MT geophysical survey results however, the hole does test the northern margin of a very large (4 km x 3.5 km x 2 km), coincident DCIP-Resistivity and 3DMT-Resistivity, conductive anomaly. Hole ALD-22-221 cut through a quartz diorite intrusion with strong stockwork quartz veining from surface to 302 m depth, before passing into a thick sequence of massive porphyritic and fragmental rhyolites to a depth of 674 m. From 674 m to 973 m, the hole encountered a sequence of massive to fragmental andesitic volcanic rocks and then, from 973 m until 1,181 m, a massive porphyritic rhyolite unit. From 1,181 m until the end of the hole at a depth of 1,487.50 m, the hole encountered the andesitic volcanic rocks again. The fragmental rhyolites are interpreted to be part of the regional ~20 Ma aged volcanic stratigraphy, whereas some of the porphyritic rhyolites may be cross-cutting intrusive dykes related to a younger mineralizing porphyry event, but further geological work, along with Re-Os molybdenite and U-Pb zircon age-dating, is being done to address this as part of an ongoing doctoral research study being completed on the project.
Drillhole ALD-22-221 encountered a strongly oxidized and leached zone to 240 m depth, followed by a ~85 m thick horizon of moderately developed secondary copper sulphide enrichment consisting of chalcocite on pyrite. This zone of enrichment is in an area within the 2021 conceptual pit shell, that is currently classified as waste material; hence this and any follow-up drilling will add to the currently known secondary copper resource. Hole ALD-22-221 also shows a strong lithological control on both favourable alteration and the better mineralization.
The rhyolite intervals display strong (a) quartz – sericite – pyrite – chalcopyrite, (b) quartz – tourmaline – pyrite, and (c) quartz – pyrite – enargite assemblages with low to moderate copper values and elevated arsenic contents. Historically the rhyolitic rocks at the Altar project have been poor and somewhat unreceptive host rocks for mineralization however, moderately mineralized rhyolites in hole ALD-22-221 suggest that the system is getting stronger such that even these less favourable host rocks are being mineralized, whereas the andesitic rocks display moderate to strong biotite and potassium-feldspar (i.e., potassic alteration) that increases towards the bottom of the hole. This potassic alteration is overprinted by an assemblage of moderate intensity green sericite-pyrite-chalcopyrite ± bornite which are associated to moderate and continuous copper grades with low arsenic contents. The entire hole is strongly anomalous in molybdenum, increasing considerably from 530 m depth with the occurrence of quartz-chalcopyrite-molybdenite veins and becoming very strong over the last 500 m of the drill hole.
The scientific and technical data contained in this news release has been reviewed and approved by Dr. Kevin B. Heather, B.Sc. (Hons), M.Sc, Ph.D, FAusIMM, FGS, Chief Geological Officer and director of Aldebaran, who serves as the qualified person (QP) under the definitions of National Instrument 43-101.
About Aldebaran Resources Inc.
Aldebaran is a mineral exploration company that was spun out of Regulus Resources Inc. in 2018 and has the same core management team. Aldebaran acquired the Rio Grande copper-gold project located in Salta Province, Argentina from Regulus along with several other early-stage projects in Argentina. Aldebaran also has the right to earn up to an 80% interest in the Altar copper-gold project in San Juan Province, Argentina from Sibanye Stillwater Limited. The Altar project hosts multiple porphyry copper-gold deposits with potential for additional discoveries. Altar forms part of a cluster of world-class porphyry copper deposits which includes Los Pelambres (Antofagasta Minerals), El Pachón (Glencore), and Los Azules (McEwen Copper). In March 2021 the Company announced an updated mineral resource estimate for Altar, prepared by Independent Mining Consultants Inc. and based on the drilling completed up to and including 2020. Aldebaran’s primary focus is the Altar project with a view to discovering new zones with higher-grade mineralization.
Figure 1 – Plan map showing drill collar locations:
Figure 2 – Section displaying ALD-22-221 in relation to the 2021 conceptual resource pit and nearby drilling:
Figure 3 – Section displaying ALD-22-221 in relation to the 3D MT Inversion resistivity geophysical anomaly:
Figure 4 – Section displaying ALD-22-220 and ALD-22-221 in relation to the 221 conceptual resource pit and nearby drilling:
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