GR Silver drills 2.7 m of 1,723 g/t AgEq at Plomosas

2020-07-07 07:55 ET – News Release

Mr. Marcio Fonseca reports


GR Silver Mining Ltd. has released drill results at its 100-per-cent-owned Plomosas silver project in Sinaloa, Mexico. These results are located in the San Juan-La Colorada Area, one of six priority areas with recent (2018) drill data being released by the Company.

These drill hole results identify silver and gold mineralized zones in a 600 m step out from the previously released drill hole results at San Juan (Figures 1 and 2) (see News Release dated May 4, 2020 ). They confirm continuity of the Au-Ag mineralized system for at least 1 km, supporting a geological model where both areas, La Colorada and San Juan, are part of a single significant epithermal system with occurrence of not only Ag-Pb-Zn mineralization hosted in polymetallic hydrothermal breccias, but also Au-Ag enriched veins in high angle fault zones.

The drilling intercepts confirm prospective, near-surface, multiple vein systems peripheral to other drilled areas. This creates the potential to delineate a much larger epithermal system for future drilling and resource estimation. To date, the Company has identified six veins in the San Juan-La Colorada Area as a result of previous drill results and surface and underground mapping/sampling. The Company believes that the Au-Ag bearing structures are part of regional scale fault systems, hosting attractive low sulphidation epithermal mineralization and thus providing the opportunity to move forward confidently with further shallow drilling.

GR Silver Mining President and CEO, Marcio Fonseca, commented, “We are very pleased with the progress of our exploration program at Plomosas. We see significant strike length, down dip extensions and the presence of multiple veins, exhibiting the potential to define a large low sulphidation epithermal system covering most of the areas previously drilled. To date, we have been able to collect key geological and geometrical components for the silver-gold mineralized system at the San Juan-La Colorada Area, providing support for our upcoming drilling program. Results to date are indicating that both mineralization styles, Au-Ag epithermal veins and Ag-Pb-Zn hydrothermal breccias, are present, defining a large system with multi-kilometre strike potential”.

1AgEq is based on long term gold, silver, zinc and lead prices of US$1600 per ounce gold, US$16.50 per ounce silver, US$0.85 per pound zinc and US$0.95 per pound lead. The metallurgical recoveries are assumed as 90% Ag, 95% Au, 78% Pb and 70% Zn.

Table 1 summarizes the most significant drill assay results for this group of holes released for the San Juan-La Colorada Area.

Summary Drill Hole Results - News Release July 7, 2020 (San Juan-La Colorada Area)
   Hole No.   From  (m)   To  (m)  Drilled  width  (m)Est.  true  width  (m)Ag g/tAu g/t  Pb %Zn %  AgEq g/t
LCS18-01      203.3       203.6     0.4                  0.4                   14    0.1   3.3   5.2           
LCS18-02      179.2       198.3     19.1                 17.2                  2     0.3   0.2   0.8           
includes      190.5       192.2     1.7                  1.5                   8     2.1   0.8   4.1           
LCS18-02      239.8       265.5     25.7                 21.8                  7     1.0   1.5   1.0           
LCS18-03      206.7       209.3     2.7                  2.4                   45    15.1  3.1   0.9 1,723     
includes      206.7       207.5     0.9                  0.8                   76    46.9  3.3   2.2 5,055     
LCS18-04      250.9       288.6     37.8                 34.0                  5     0.3   0.8   1.0           
includes      276.0       287.6     11.6                 10.4                  7     0.7   1.6   2.3           
              368.9       370.0     1.2                  1.0                   182   0.3   0.1   0.2 224       
LCS18-05      242.9       270.7     27.8                 25.0                  26    0.3   0.6   0.8           
includes      247.0       251.5     4.5                  4.0                   126   1.6   1.3   1.7 380       

*AgEq is based on long term gold, silver, zinc and lead prices of US$1600 per ounce gold, US$16.50 per 
ounce silver, US$0.85 per pound zinc and US$0.95 per pound lead. The metallurgical recoveries are assumed 
as 90% Ag, 95% Au, 78% Pb and 70% Zn. "na" = no relevant assays. All numbers are rounded. Results are 
uncut and undiluted.

The drill holes in this news release were generated by a drill campaign completed by First Majestic Silver Corp. (“First Majestic”) in 2018 and not previously released. They are part of an extensive surface and underground diamond core drilling database, which GR Silver Mining is consolidating and validating.

Table 2 lists the drill hole intervals previously not sampled (“NS”) for this group of released holes. The Company is investigating these holes for evidence of mineralization in the core that warrants additional sampling and assaying.

Table 3 provides collar coordinates for the drill holes presented in this news release.

Table 2: San Juan-La Colorada Area - Drill Hole Intervals Not Sampled (Intervals greater than 20m)
   Hole No.From-To (m)    Sampling  Hole No.From-To (m)   Sampling
LCS18-01  0-132.95     NS        LCS18-03  152.2-166.9 NS        
LCS18-01  141.75-195.45NS        LCS18-03  172.1-184.55NS        
LCS18-01  242-270.05   NS        LCS18-03  209.3-214   NS        
LCS18-02  0-177.7      NS        LCS18-04  0-156.1     NS        
LCS18-02  298.35-307.3 NS        LCS18-04  389.85-453.1NS        
LCS18-02  410.75-450.5 NS        LCS18-05  0-165.9     NS        
LCS18-03  0-89.75      NS        LCS18-05  182.6-184   NS        
LCS18-03  112-147      NS        LCS18-05  207.7-242.5 NS        

   All numbers are rounded. NS - Core not assayed by First Majestic


The San Juan-La Colorada Area drill results continue to demonstrate the continuity of higher-grade mineralization along strike, expanding the footprint of the low sulphidation epithermal system for approximately 1km. The high grades encountered indicate both Au-Ag and Ag-Pb-Zn styles of mineralization in an area with multiple deep-rooted fault systems, creating a prospective setting for future discoveries (Photo 1).

The low sulphidation epithermal Au-Ag system is hosted predominantly in high-angle faults, whereas the Ag-Pb-Zn mineralization is preferentially in shallow angle faults and polymetallic hydrothermal breccias (click here to view cross sections). Both mineralization styles have developed due to a combination of multiple deep-rooted fault structures in a multi-event system, where precious metals appear to be the younger mineralized phase. The deep-rooted regional structures transect and served as a fluid conduit for a large underlying hydrothermal system, cross cutting a volcanic sequence made of andesites, tuffs and rhyolites, where brittle fracturing in host rocks has created voids or traps for deposition of both styles of mineralization. The combination of these structures, together with favorable host rocks (permeability and porosity), have generated numerous alteration halos (argillic, propylitic, oxidation and silicification) (Figures 1 and 2). These altered areas are exploration guides for future drilling and expansion of the mineralization footprint.

The Company is implementing detailed core relogging and multi-element analysis by portable hand-held XRF (pXRF), particularly in non-sampled areas, prior to being submitted to the laboratory for detailed chemical analysis. Using pathfinder elements, the pXRF results enable data-driven determination of the mineralized and un-mineralized alteration mineral assemblages. The Company has successfully implemented a pXRF program at its nearby projects, where it has proven to be a cost- and time-effective first pass analytical method.

Previous owners completed aero- and ground geophysical surveys (magnetometry and IP) covering most of the deep-rooted regional faults. In general, for an IP survey, resistivity anomalies delineate the fault system and chargeability differentiates oxide vs. sulphide mineralization potential at depth. High resolution airborne magnetometry was undertaken by First Majestic in 2016, covering the Plomosas Project. This form of geophysical investigation is important in defining regional and local scale lithological variations, as well as potentially buried intrusive bodies that can be important heat and fluid sources in the genesis of epithermal mineralization in volcanic environments such as at Plomosas. Fluid flow derived from epithermal systems can result in the local destruction of magnetism, particularly along structural pathways, which can also be used as a targeting tool.

This geophysical ‘fingerprint’ of the mineralized system, together with the abundance of faults, has resulted in promising new prospective zones for oxide and sulphide mineralization types. GR Silver Mining continues to update the 3D geological model of exploration together with results from drill holes, bedrock mapping and soil and rock geochemistry and geophysics, generating data-driven, drill-ready targets supported by all four data sets.

Qualified Person

The scientific and technical data contained in this News Release related to the Plomosas Project was reviewed and/or prepared under the supervision of Marcio Fonseca, P.Geo. He has approved the disclosure herein.

Quality Assurance Program and Quality Control Procedures (“QA/QC”)

The recent drill holes completed by First Majestic from 2016 to 2018, followed QA/QC protocols reviewed and validated by GR Silver Mining, including insertion of blank and standard samples in all sample lots sent to First Majestic’s Laboratorio Central facilities in La Parilla, Durango, for sample preparation and assaying. Additional validation and check assays were performed by an independent laboratory at SGS de Mexico, S.A. de C.V. facilities in Durango, Mexico. The analytical methods applied for these recent holes for Ag and Au assays comprised of Fire Assay with Atomic Absorption finish for samples above Au >10ppm and Ag >300ppm and Gravimetric Finish. Pb and Zn were analyzed using Inductively Coupled Plasma Optical Emission Spectrometry.

The Company has also negotiated debt settlement with arm’s length and non-arm’s length creditors. Pursuant to the debt settlement agreements, and subject to acceptance by the TSX-V, the Company has settled aggregate debt of $207,728 outstanding as at June 30, 2020, in consideration for which it will issue an aggregate of 437,322 common shares at a deemed price of $0.475 per share. Certain insiders of the Company participated in the debt settlements (Marcio Fonseca, the Company’s President, CEO and director, agreed to settle $7,500 debt for 15,790 shares; Blaine Bailey, the Company’s CFO, agreed to settle $7,500 debt for 15,790 shares; and Trevor Woolfe, the Company’s VP Corporate Development & Exploration, agreed to settle $15,000 debt for 31,579 shares). Participation by Insiders in the debt settlements is also considered a “related party transaction” pursuant to MI 61-101. The Company is exempt from the requirements to obtain a formal valuation and minority shareholder approval in connection with the Insiders’ participation in the debt settlements in reliance of sections 5.5(a) and 5.7(a) of MI 61-101, respectively, on the basis that participation in the debt settlements by the Insiders did not exceed 25% of the fair market value of the Company’s market capitalization. All shares issued in relation to these debt settlements are subject to a hold period expiring four months + one day after the date the shares are issued, in accordance with applicable securities laws and the policies of the TSX-V.

About GR Silver Mining Ltd.

GR Silver Mining Ltd. is a Mexico-focused company engaged in cost-effective silver-gold resource expansion on its key assets which lie on the eastern edge of the Rosario Mining District, Sinaloa, Mexico.

We seek Safe Harbor.

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