Mr. Darren Hall reports
CALIBRE MINING DISCOVERS HIGH-GRADE GOLD MINERALIZATION AT LIBERTAD'S VOLCAN TARGET
Calibre Mining Corp. has provided an update of the company's 2021 drilling program, highlighting recent results of exploration drilling and the discovery of a zone of high-grade gold mineralization along the Volcan trend located within five kilometres of the Libertad mill.
Highlights:
Confirmed good continuity of gold mineralization over a 1.5-kilometre strike length to a depth ranging from 100 to 250 metres with the vein system remaining open along strike and at depth;Eight of nine holes intercepted at least one vein structure hosting significant gold grades over estimated true widths ranging from 1.5 to 10 metres;A central zone of significantly higher-grade mineralization extends at depth between 150 and 250 metres from surface;To date, drilling has only tested a 1.5-kilometre section of the five-kilometre Volcan trend, which is located within five kilometres of the Libertad mill.
Volcan deposit drill results:
15.6 grams per tonne gold over 4.9 m estimated true width (ETW) from 96 metres and 7.88 g/t gold over 3.4 metres ETW from 116 metres (VN-21-041);3.91 g/t gold over 1.4 metres ETW from 100 metres and 4.13 g/t gold over 9.2 metres ETW from 122 metres (VN-21-043);8.75 g/t gold over 1.8 metres ETW from 165 metres and 3.80 g/t gold over 1.8 metres ETW from 214 metres (VN-21-044).
Previously reported Volcan drill results (see Calibre news release dated June 8, 2021):
11.37 g/t gold over 5.4 metres ETW from 61.4 metres (VN-21-026);9.26 g/t gold over 1.7 metres ETW from 76.9 metres (VN-21-030A);2.37 g/t gold over 6.2 metres ETW from 67.2 metres (VN-21-032).
Darren Hall, president and chief executive officer of Calibre, stated: "We are excited to report these latest drill results from our exploration program at Libertad confirming a second zone of high-grade gold mineralization along the prospective Volcan trend. In addition to delineating a 1.5-kilometre trend of near-surface gold mineralization, the discovery of a high-grade core zone, which remains open at depth presents an opportunity to deliver another source of low-cost, high-margin mill feed within close proximity to the Libertad mill. Together with the delineation and resource conversion campaigns at the nearby Tranca and Rosario deposits, we continue to see excellent potential to leverage the plus one million tonnes of excess processing capacity at Libertad.
"As we continue to identify new targets and expand resources at both our mine sites and exploration concessions, we are only beginning to realize the significant discovery potential our portfolio of mineral concessions has to offer. As we approach the close of 2021, our exploration and resource delineation drilling programs continue at Libertad, Pavon Central, Limon and Eastern Borosi, setting us up for an exciting 2022."
Earlier this year Calibre released the results of exploration and resource conversion drilling at the Volcan, Tranca and Rosario deposits (see Calibre news releases dated Sept. 8, 2021, and June 8, 2021, for more details). During 2020, our team successfully increased reserves over 200 per cent (see Calibre news release dated March 29, 2021) and discovered multiple new gold zones within the shadow of the headframe at both mine sites.
2021 Cerro Volcan exploration drill program
Since confirming the presence of near-surface high-grade gold mineralization at Cerro Volcan earlier this year, Calibre has continued exploring the Volcan vein trend as it extends along strike to the southwest. Drilling to date has tested two zones of near-surface mineralization along the trend that has been traced by surface mapping and sampling for approximately five kilometres along strike. Most recently, drilling has focused on an untested 600-metre gap between the two zones, confirming both the continuity of near-surface gold mineralization along a 1.5-kilometre section of the Volcan structure as well the presence of a new zone of higher-grade gold mineralization beginning at approximately 150 m vertical depth from surface and extending approximately 300 metres along strike. This new zone remains open at depth and in both directions along strike. Previous drilling completed in 2012 and 2017 by B2Gold tested the upper 100 metres in two areas along the Volcan trend, returning localized high-grade intercepts including 9.69 g/t gold over 10.7 m ETW from 49 metres, 10.56 g/t gold over 4.5 m ETW from 41.2 metres, and 5.78 g/t gold over 4.1 metres from 111.2 metres (see Calibre news release dated June 8, 2021, for more details).
The Volcan vein trend is located approximately five kilometres south of the Libertad mill. It is one of several subparallel vein structures that extend across the Cosmatillo area, a zone of widespread epithermal-style hydrothermal alteration. The company plans to continue systematic exploration drilling along the Volcan trend done in tandem with the generation of new drill targets in the highly prospective Cosmatillo area.
Quality assurance/quality control
Calibre maintains a quality assurance/quality control (QA/QC) program for all its exploration projects using industry best practices. Key elements of the QA/QC program include verifiable chain of custody for samples and regular insertion of certified reference standards and blanks and duplicate check assays. Drill core is halved and shipped in sealed bags to Bureau Veritas in Managua, Nicaragua, an independent analytical services provider with global certifications for quality management systems International Organization for Standardization 9001:2008, environmental management ISO 14001, and safety management OH SAS 18001 and AS4801. Prior to analysis, samples are prepared at Veritas's Managua facility and then shipped to its analytical facility in Vancouver, Canada. Gold analyses are routinely performed via fire assay/AA (atomic absorption) finish methods. For greater precision of high-grade material, samples assaying 10 g/t Au or higher are reassayed by fire assay with gravimetric finish. Analyses for silver and other elements of interest are performed via induction coupled plasma spectrometry (ICP).
Estimated true widths (ETW) for reported vein intercepts are based on 3-D models of the individual veins. Estimates are determined in cross-section by measuring the modelled vein thickness perpendicular to the vein margins and through the midpoint of the drill hole intercept. Percentage-based differences between individual ETWs and downhole interval lengths will vary between drill holes depending on drill hole inclination, variations in vein strike and dip, and overall geometries of the different vein systems.
Qualified person
The scientific and technical data contained in this news release have been reviewed and approved by Mark A. Petersen, PGeo, vice-president, exploration, and a qualified person as defined by NI 43-101.
About Calibre Mining Corp.
Calibre Mining is a Canadian-listed gold mining and exploration company with two 100-per-cent-owned operating gold mines in Nicaragua. The company is focused on sustainable operating performance and a disciplined approach to growth. Since the acquisition of the Limon and Libertad gold mines and the Pavon gold project, Calibre has proceeded to integrate its operations into a hub-and-spoke operating philosophy, whereby the company can take advantage of reliable infrastructure, favourable transportation costs, and multiple high-grade mill feed sources that can be processed at either Limon or Libertad, which have a combined 2.7 million tonnes of annual mill throughput capacity.
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