Mirasol Resources Ltd. (TSX-V: MRZ) (OTCPK: MRZLF) is pleased to report results from the final twelve diamond drill holes from the Phase I exploration program completed in Q4 2020 at the Virginia Silver Project, located in Santa Cruz province, Argentina. The program was funded by Silver Sands Corp. under an option to purchase agreement. The drill holes at Julia South and Martina and the previously released holes (see news release January 21, 2021) clearly show the potential for significant new mineralization outside of the current NI 43-101 resource¹ area. Shallow and high-grade mineralization has now been defined in six new zones, including at Julia South, Ely Central and Martina. Mirasol and Silver Sands are continuing to drill extensively with the objective of expanding the mineralized footprint and potentially updating the resource in late 2021.
Mirasol’s interim-President, Tim Heenan, commented: “I am very encouraged with the initial results from our very prospective Virginia silver project. With the results from Phase I in hand, it is clear that the size of the resource has the potential to grow significantly.”
Phase I drilling completed at Virginia in late 2020, which encompassed 18 drill holes for a total of 2,831m, confirmed the potential to identify new well-mineralized structures that were not previously included in the NI 43-101 resource. All the drilling in Phase I, except for the holes at the Magi target, focused on potential strike extensions along the known trends that host the current resource and also previously untested vein structures.
The diamond drill holes reported in this release are considered encouraging and assist in a better understanding of the structural setting, including the recognition of down dropped blocks and post mineralization displacement which is now interpreted to play an important role. In Julia South, this is evident with the upper levels of the vein system preserved in drill holes JS-DDH-001 and JS-DDH-002. As a result, the potential mineralized shoots, that may exist at depth, would be fully preserved, compared to the outcropping Julia shoots further to the north which have been subject to some degree of erosion with high Ag values at surface. This data was incorporated in targeting the ongoing Phase II drill program.
Several drill holes intercepted hematite matrix breccia hosting silica clasts, which is interpreted as being a late structural reactivation hydrothermal event. These hematite breccias typically occur in the higher levels of the mineralized system and are shown to have transported mineralized clasts upwards from deeper parts of the system. Deeper drilling and lateral step-outs in these areas are required to define the geological environment represented by these zones. This concept will also be tested during the current Phase II program.
In summary, the southern and eastern parts of Virginia are interpreted to represent the higher and cooler levels in the epithermal/hydrothermal system and also a higher level in the local volcanic stratigraphy.
The drill results are summarized below with assay results reported in Table 1.
Drill Results Review
The Julia South hole JS-DDH-001, collared 100m south of the previous drill holes incorporated in the conceptual pit confined resource, intersected an 8.5m thick brecciated structure grading 123.43 g/t Ag, including 3.90m at 168.34 g/t Ag. Colloform to crustiform banded crypto crystalline vein fragments with sulfides returned a peak result of 271 g/t Ag over 0.33m. This intercept is hosted in low temperature late cross-cutting chalcedonic silica with a latter and final manganese oxide (MnOx) rich pulse. Minor hydrothermal breccia structures with Ag anomalies exist throughout the hole. It is interpreted that this hole sits within a downthrown structural block that is less eroded than the area to the north, which hosts a significant part of the Virginia Ag resource. Phase II drilling will test beneath this intercept to confirm this concept.
The Julia South hole JS-DDH-002 intersected hydrothermal polymictic breccia with quartz vein fragments in hematite silica matrix. The existence of quartz vein fragments suggests that a potential target may exist at depth below the silica-hematite matrix breccia.
The Julia SE hole JSE-DDH-001 intersected a strongly oxidized hydrothermal polymictic breccia with wall rock and vein fragments, grading 140.27 g/t Ag over 4.20m at 70m downhole. Quartz vein fragments display colloform banding and also fine crystalline quartz textures. Some of the fragments show low temperature silica species with breccias and veinlets cutting the structure hosting a peak sample of 483 g/t Ag over 0.35m. The presence of banded vein fragments mixed with polymictic wall rock breccia suggests that these mineralized fragments have been sourced from deeper in the structure, which requires deeper drilling.
The Martina SE hole MSE-DDH-002 intercepted 4m at 48.62 g/t Ag and 2.45m at 65.7 g/t Ag including 0.85m at 111.03 g/t Ag, which was hosted in a zone of strong brecciation (fault breccia?) crosscut by channels of hydrothermal polymictic breccias and massive cryptocrystalline quartz veinlets, returning up to 135 g/t Ag over 0.55m.
The Martina SE hole MSE-DDH-003 hosts a 1m wide weakly banded sulfide rich (galena) vein with micro crystalline quartz and MnOx cavity infilling discrete fractures with up to 596.54 g/t Ag over 0.3m. This banded vein with hematite/limonite seams hosts values of 16.05m at 63.97 g/t Ag including 0.9m at 352.32 g/t Ag.
The Ely Central hole EC-DDH-002 intercepted hydrothermal breccia with wall rock fragments returning up to 60 g/t Ag and outward halos of crackle hydrothermal breccias with silica hematite cement with up to 30 g/t Ag. As mentioned above, these hematite cemented breccias are generally believed to be high up in the vein system or represent weaker mineralized sections of the hosting structure between the mineralized shoots. A lower grade, anomalous intersect of 3.00m at 50.14 g/t Ag was returned from this hole.
The Martina SW hole MSW-DDH-001 intercepted hydrothermal polymictic breccia with quartz vein fragments in hematite silica matrix (fault zone?). The structure hosts stockworks and crackle brecciation with a low grade but anomalous intersect of 1.10m at 33.61 g/t Ag.
Five holes failed to intersect significant mineralization, including two holes at Eli Central, one hole at Magi, the second hole at Naty Extension and a scout hole on a geophysical target in between the Maos and Johanna targets.
Table 1: Virginia Final Phase I Significant Intercepts
|Hole ID||From||To||Interval (m)1||Ag g/t2||Ag x Interval3||Cut-off4|
|JC-DDH-001||no interval to report||30 g/t|
|JC-DDH-002||no interval to report||30 g/t|
|MaJo-DDH-001||no interval to report||30 g/t|
|MG-DDH-002||no interval to report||30 g/t|
|NE-DDH-002||no interval to report||30 g/t|
1 Reported interval length are down hole widths and not true widths.
2 Reported intervals are at the stated a cut-off grade of 30 g/t Ag (with a minimum width of 0.5m), 63 g/t Ag and 150 g/t Ag. Reported intervals may include up to a maximum of 1m individual section below cut-off grade.
3 Ag Gram Meter interval is calculated using: Ag (g/t) x down hole intersection length (m).
4 The higher-grade intervals were selected using the 63 g/t cut-off grade used in the NI 43-101 resource estimate.
Table 2: Virginia Final Phase I Collar Location
|Hole Id||Easting||Northing||Elevation (m)||Azimuth||Dip||Depth (m)|
About Mirasol Resources Ltd
Mirasol is a well-funded exploration company focused in Chile and Argentina. Mirasol has six partner-funded projects, two with Newcrest Mining Ltd (Chile), and one each with First Quantum Minerals (Chile), Mine Discovery Fund (Chile), Mineria Activa (Chile) and Silver Sands Resources (Argentina). Mirasol is currently self-funding exploration at two projects, Inca Gold (Chile) and Sacha Marcelina (Argentina).
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