VANCOUVER, BC, April 13, 2010 – Mirasol Resources Ltd. (TSX-V: MRZ, Frankfurt: M8R) is pleased to announce the results of 14 infill channels averaging 855 gram per tonne (g/t) silver at the Julia Vein, Virginia Vein Zone in Santa Cruz province, Argentina. Combined with the previously announced 44 channels from the Julia Vein (March 4, 2010) there are now 58 channel composites with an average grade of 805 g/t silver and an average minimum true width of 1.76 metres along the vein’s greater than 2,000 metre strike length. New results give additional certainty of high silver grades over minimum widths and length for the Julia silver vein.
Infill sampling was performed between previous channel lines to increase the sample density along the Julia Vein from the original nominal spacing of 50 metres. Saw-cut channels were prepared from which 29 samples were collected, for a cumulative length of 13.38 metres in 14 new composite sample lines (Table 1 and Figure 1 ). Sampling and reporting methods used in the current work are the same as previously used (see Technical Appendix of March 4, 2010 press release).
Table 1. Julia Vein Infill Channel Samples –New Results
Sampled Length (m) 1
Gaps as % of Total Length
Silver (g/t) 4,
Length Weighted Average Channels =
Notes: All analyses performed by ALS Chemex Laboratory.
1. Sampled Length is the actual true width that was sampled.
2. Unsampled Gaps are the cumulative length of any gaps in outcrop which were not sampled. See Technical Appendix of March 4, 2010 press release for details.
3. Total Length is the sum of sampled outcrops, plus any gaps which could not be sampled.
4. The length weighted silver, gold and lead averages are based on the sampled width, not the total length; all values are uncut (i.e., no grade cap has been applied).
5. Silver results are by Ag-GRA21, a fire assay collection method with gravimetric finish.
6. Lead results to 10,000 ppm (1%) are by ME-ICP41 with over values >1% by Pb-OG46.
7. Channels so marked have sampling gaps greater than 20% of their total length. See Technical Appendix of March 4, 2010. press release.
8. Channel JU-39270 is a large block thought to be in-situ; other channels are of outcrop.
9. Gold assayed by Au-AA24, a fire assay collection method with atomic absorption spectroscopy finish. Gold values for the channel composites range from
Calculations of average grades and minimum true widths of the Julia Vein have been updated using the new and previously reported channel assays (Table 2). The revised average for all 58 channel sample composites on the Julia Vein is 805 g/t silver and 1.16% lead over a minimum true width of 1.76 metres.
Table 2. Julia Vein Channel Composites – All Present and Previous Results
Number of Channel Lines
Total Lengths Sampled
Min. True Width
all previous data
It was previously reported that two segments of the Julia Vein had higher silver grades and vein widths. The new channel sample data has been incorporated into updated calculations of the north and south segments, and two new short intervals in the central segment (Table 3). Sampling reported herein (Table 1) represents infill on all three of these segments and is shown together with previously published results ( Figure 2 ). With infill sampling the average interval between channel sample composites is 26 metres in the North segment and 15 metres in the South segment. Combined, the tabulated segments have an average grade of 919 g/t silver with a minimum true width of 1.78 metres over a total strike length of 843 metres (Table 3).
Table 3. Julia Vein Segments – Compiled Results
Julia Vein Segment
Number of Channel Lines
Total Lengths Sampled
Min. True Width
he Northern Segment is 520 metres in length, north-northwest striking, and is characterized by relatively consistent grades that average 935 g/t silver over an average minimum width of 1.66 metres wide. The Central Segment is less well exposed along a northwest-trending strike length of 470 metres with more variable grades. Two very high-grade subsets, of 13 and 50 metres strike length each, are evident from the sampling of outcrop and subcropping blocks. These sections have returned 5 channel intervals which range from 0.7 metres of 4,740 g/t silver to 3.74 metres of 1,592 g/t silver. The Southern Segment is north-northeast trending over a strike length of 260 metres within which grades and widths are relatively consistent, averaging 693 g/t silver over 1.78 metres width.
The infill channel sampling on the Julia Vein has confirmed the surface continuity of high-grade silver along at least 843 cumulative metres of the known >2,000 metre vein strike length, thereby strengthening proposed drill targets at the Virginia vein zone.
As previously reported, wall rock to the vein is not exposed and sampling is limited to the width of the exposed vein which therefore represents the minimum true width. Systematic trenching or drilling will be required to accurately determine the full mineralized width of the vein structures and their grades.
Recent mapping and sampling at the Virginia vein zone continues to reveal new veins and to extend the strike length of mineralized structures. Results are pending for approximately 250 rock samples taken from additional channels, collected during vein definition and while prospecting for new veins and vein extensions. Preliminary results from current geophysical surveys suggest additional drill targets exist in soil-covered areas along strike from known veins. Mirasol’s management is highly encouraged by silver assay results received to date and potential for high grade shoots at the Julia Vein.
Paul G. Lhotka, Principal Geologist for Mirasol, is the Qualified Person under NI 43-101 who has approved the technical content of this news release.
Quality Assurance/Quality Control:
Exploration at Mirasol’s Projects is supervised by Stephen C. Nano, Vice President of Exploration; Exploration Manager, Timothy Heenan; and Principal Geologist, Paul Lhotka, all qualified persons under NI 43-101. All technical information for the Company’s projects is obtained and reported under a formal quality assurance and quality control (QA/QC) program. Rock chip and stream sediment samples are collected under the supervision of Company geologists in accordance with standard industry practice. Samples are dispatched via commercial transport to an ISO 9001:2000-accredited laboratory in Mendoza, Argentina for analysis. Results are routinely examined by an independent geochemist to ensure laboratory performance meets required standards.
All assay results reported herein are for surface rock chip samples; assay results from subsurface drill core or RC samples may be higher, lower or similar to results obtained from surface samples.
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