Filo Mining Corp. (TSX-V: FIL) (Nasdaq First North Growth Market: FIL) (OTCQX: FLMMF) is pleased to announce the discovery of a significant new zone of high-grade copper, gold and silver mineralization at the Filo del Sol project in San Juan province, Argentina.
Highlights are listed below, along with accompanying figures:
Commenting on the results, President and CEO Jamie Beck said “Hole 41 is a game-changer for the project and by far the best hole ever drilled at Filo del Sol. We believe it will rank as one of the best holes drilled globally this year. It represents the first intersection of the long-sought feeder zone for the high-sulphidation mineralization at Filo. These results reset our expectations of what is possible at Filo. Our drilling over the past three years has confirmed the vast size potential of this deposit and with hole 41 we have demonstrated this system can also produce exceptional grades. This results in a compelling combination of values and provides us with the evidence we need to justify expanding our exploration efforts. We remain convinced that Filo del Sol will turn out to be one of the most important copper-gold-silver discoveries in recent years and we see strong potential for additional high-grade zones as we drill out the deposit. We look forward to sharing exploration results from our remaining holes, culminating in a resource update by year end. Planning has already begun for our next field campaign, and following a short break, we anticipate continuous, year-round activities leading to our most ambitious field program ever.”
A total of nine holes have now been completed during the current program, with five in progress. Assay results for seven of the holes have been released, with the remainder to come. The program has been successful in expanding the deposit by 1 kilometre to the north, 250m to the east, and it remains open in both these directions as well as at depth.
|HOLE-ID||From (m)||To (m)||Length (m)||Cu %||Au g/t||Ag g/t||CuEq %|
Hole FSDH037 was started during the past season at an angle of -70 degrees towards the west and was curtailed as that program ended due to the pandemic. The hole was deepened this season to a final depth of 882m where it was stopped due to drilling problems. The hole ended in strong mineralization, with the last 20m averaging 0.84% CuEq (0.68% Cu; 0.20g/t Au; 2.3g/t Ag). This hole is 400m north of FSDH041 and bottoms 360m south of FSDH043. Similar to FSDH043, copper values increased towards the bottom of the hole. Mineralization in this hole is visually subtle and is contained in a very homogeneous section of rhyolite which contains disseminated sulphides and is cut by a weak stockwork of quartz veinlets.
Hole FSDH041 was collared 200m north of FSDH032 and drilled at an angle of -75 degrees towards the west to a final depth of 1,046m. The hole was abandoned due to drilling difficulties, but ended in strong mineralization, with the final 20m averaging 1.20% CuEq (0.65% Cu; 0.72g/t Au; 2.3g/t Ag). The hole was planned to test the northern extension to the strong mineralization encountered in FSDH032 and was drilled below an historical reverse circulation hole (VRC071) which was 406m long and intersected 20m at 1.51% CuEq (1.10%Cu; 0.63g/t Au; 1.1g/t Ag) towards the bottom.
FSDH041 intersected various hydrothermal breccias between 360 and 502m, followed by a strongly altered rhyolite, which is cut by several porphyry intervals towards the bottom of the hole. This rhyolite is overprinted, starting at a depth of 780m, by an intense residual silica alteration with abundant sulphides, which is interpreted to be a feeder structure and contains very high copper, gold and silver values. Mineralization in this interval is similar to the extensive overlying silver zone which was intersected between 376 and 496m and is characterized by a typical HSE assemblage of very high copper, gold and silver values with associated arsenic. This deep zone in hole FSDH041 is the only place outside of the well-defined, flat-lying tabular silver zone where high-grade silver values are seen, suggesting that it represents a feeder to the silver zone. The intersection lies some 400m below the overlying silver zone, implying substantial vertical continuity if they are connected.
Additional drilling is required to determine the geometry and orientation of the high-grade mineralization intersected in this hole, and its true width is currently uncertain.
The breccia bodies and porphyry intrusives in FSDH041 correlate well with those in hole FSDH032. The alteration and mineralization patterns are consistent with a high sulphidation system, with advanced argillic alteration accompanied by copper sulphides such as tennantite-covellite-chalcocite, overprinting a porphyry system with abundant “A” veins and remanent potassic alteration containing chalcopyrite and bornite. Holes FSDH041 and FSDH037 strongly suggest that mineralization is continuous between holes FSDH032 and FSDH043, opening an extensive area of very high mineral potential.
Hole FSDH045 was collared 200m north of FSDH041 and 200m south of FSDH037 and drilled towards the west at -76 degrees. The hole was abandoned at a depth of 359m in strongly altered and leached rock which created difficult drilling conditions. The hole ended above the projection of the silver zone and underlying sulphide mineralization, encountering two short, mineralized intervals as shown in the accompanying table.
Drilling results continue to support our interpretation of Filo del Sol as a telescoped HSE / porphyry copper-gold system which has created a very large, diverse mineral system with variations in deposit geometry, grade distribution and mineralogy. All of these will have important implications for ongoing exploration and conceptual development scenarios. Mineralization can be generally grouped into three zones based on mineralogy. The shallowest zone is the oxide/sulphate zone, which is amenable to heap leach processing, and forms the design basis of the PFS project. This mineralization is the product of weathering, oxidation, and supergene enrichment of the underlying primary sulphide mineralization (comprised of both HSE mineralization and porphyry mineralization). Due to the telescoped nature of the deposit, the HSE and porphyry mineralization are generally overlapping or adjacent, with a general trend of HSE transitioning to porphyry at depth and to the east.
HSE mineralization post-dates and overprints the earlier porphyry mineralization, increasing the copper, gold, silver, and arsenic grades as the mineralogy changes. Copper mineralization in the HSE zone generally consists of covellite/tennantite/chalcocite/bornite while the porphyry mineralization is more typically chalcopyrite/bornite/covellite.
Results from this season’s program have exceeded expectations and provide strong evidence that the Company is beginning to outline a major mineral deposit, of which the reserve underpinning the January 2019 Pre-Feasibility Study is just a small part. With these latest results, the Company believes that the exploration target (see News Release dated June 25, 2020) of between 1.2 and 1.6 billion tonnes at 0.7% to 1.0% CuEq (in addition to the current mineral resource) will not only be realized but has obvious potential to be expanded. We also expect that the mining project scoped in the PFS could ultimately provide the initial stage of a much larger project. Additional exploration drilling, resource definition drilling, and metallurgical testwork planned for the upcoming field campaign will begin the process of investigating what that operation might look like.
Drilling will continue until the end of May 2021, contingent on continued successful management of COVID-19 and weather conditions at the project site. Field operations will be paused for 6-8 weeks while the Company prepares the drills and camp facilities for continuous, year-round field operations. A program of comprehensive sulphide metallurgical testwork will also be initiated, with samples comprised of drill core from the ongoing program.
About Filo del Sol
Filo del Sol is a high-sulphidation epithermal copper-gold-silver deposit associated with one or more large porphyry copper-gold systems. Overlapping mineralizing events combined with weathering effects, including supergene enrichment, have created several different styles of mineralization, including structurally-controlled and breccia-hosted gold, manto-style high-grade silver (+/- copper) and high-grade supergene enriched copper within a broader envelope of disseminated, stockwork and breccia-hosted sulphide copper and gold mineralization. This complex geological history has created a heterogeneous orebody which is characterized by zones of very high-grade copper +/- gold +/- silver mineralization within a large envelope of more homogeneous, lower-grade mineralization.
Qualified Persons and Technical Notes
The scientific and technical disclosure for the Filo del Sol Project included in this news release have been reviewed and approved by Bob Carmichael, B.A.Sc., P.Eng. who is the Qualified Person as defined by NI 43-101. Mr. Carmichael is Vice President, Exploration for the Company. Samples were cut at Filo Mining’s operations base near the town of Guañizuil, Argentina by Company personnel. Diamond drill core was sampled in 2 metre intervals (except where shortened by geological contacts) using a rock saw for sulphide mineralization. Oxide mineralization was cut with a core splitter in order to prevent dissolution of water-soluble copper minerals during the wet sawing process. Core diameter is a mix of PQ, HQ and NQ depending on the depth of the drill hole. Samples were bagged and tagged and packaged for shipment by truck to the ALS preparation laboratory in Mendoza, Argentina where they were crushed and a 500g split was pulverized to 85% passing 200 mesh. The prepared samples were sent to the ALS assay laboratories in either Lima, Peru or Santiago, Chile for copper, gold and silver assays, and multi-element ICP and sequential copper analyses. ALS is an accredited laboratory which is independent of the Company. Gold assays were by fire assay fusion with AAS finish on a 30g sample. Copper and silver were assayed by atomic absorption following a 4 acid digestion. Samples were also analyzed for a suite of 36 elements with ICP-ES and a sequential copper leach analysis was completed on each sample with copper greater than 500ppm (0.05%). Copper and gold standards as well as blanks and duplicates (field, preparation and analysis) were randomly inserted into the sampling sequence for Quality Control. On average, 9% of the submitted samples are Quality Control samples. No data quality problems were indicated by the QA/QC program.
Mineralized zones within the Filo del Sol deposit are typically flat-lying, or bulk porphyry-style zones and drilled widths in holes FSDH037 and FSDH045 are interpreted to be very close to true widths. The true width of the high-grade silicified zone in FSDH041 is unknown, and additional drilling is planned in order to understand its geometry.
Copper Equivalent (CuEq) for drill intersections is calculated based on US$ 3.00/lb Cu, US$ 1,500/oz Au and US$ 18/oz Ag, with 80% metallurgical recoveries assumed for all metals. The formula is: CuEq % = Cu % + (0.7292 * Au g/t) + (0.0088 * Ag g/t).
About Filo Mining
Filo Mining is a Canadian exploration and development company focused on advancing its 100% owned Filo del Sol copper-gold-silver deposit located in Chile’s Region III and adjacent San Juan Province, Argentina. The Company’s shares are listed on the TSXV and Nasdaq First North Growth Market under and on the OTCQX. Filo Mining is a member of the Lundin Group of Companies.
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We acknowledge the [financial] support of the Government of Canada.