Mr. Russell Ball reports
CALIBRE MINING REPORTS RESULTS FROM B2GOLD DRILLING PROGRAM AT EL LIMON; VEIN SYSTEM NOW EXTENDS OVER 2.5 KILOMETRES
Calibre Mining Corp. has released 2018 and 2019 drilling results from El Limon. B2Gold Corp. was successful in extending gold mineralization along the El Limon vein system for over 2.5 kilometres, with high-grade intercepts at Limon Sur, Limon Central, Limon Norte, Tigra, Chaparral and Cacao vein system, as well as from the newly developed Atravesada and Panteon underground targets.
Calibre is currently processing ore at El Limon from the Santa Pancha underground mine and an open pit developed on the Limon Central deposit, which covers approximately 500 metres of the known 2.5-kilometre-long El Limon vein system. The El Limon vein system remains open along strike and at depth.
Highlights and key drill intercepts
(2018 and 2019 drilling completed by B2Gold)
Drilling returned high-grade gold intercepts from the Limon Central open-pit zone, including:
grams per tonne gold over a 28.10-metre estimated true width (ETW) in hole LIM-18-4227;
- 10.53 g/t Au over 23.60 m ETW in hole LIM-18-4327;
- 8.66 g/t Au over 26.40 m ETW in hole LIM-18-4235;
- 9.45 g/t Au over 22.92 m ETW in hole LIM-18-4251.
Drilling returned high-grade gold intercepts from the Limon Norte open-pit zone, including:
- 10.82 g/t Au over 20.42 m ETW in hole LIM-18-4359;
9.66 g/t Au over 20.63 m ETW in hole LIM-18-4267;
20.24 g/t Au over 8.95 m ETW in hole LIM-18-4363;
5.49 g/t Au over 32.31 m ETW in hole LIM-18-4361;
6.54 g/t Au over 12.00 m ETW in hole LIM-18-4241;
- 9.00 g/t Au over 6.42 m ETW in hole LIM-18-4262.
Drilling returned high-grade gold intercepts from the Tigra open-pit zone, including:
- 16.50 g/t Au over 6.08 m ETW in hole LIM-18-4272;
17.97 g/t Au over 5.55 m ETW in hole LIM-18-4281.
Drilling returned high-grade gold intercepts from the Chapparal open-pit zone, including:
- 14.28 g/t Au over 7.30 m ETW in hole LIM-18-4237;
- 2.99 g/t Au over 25.47 m ETW in hole LIM-18-4232.
Drilling returned high-grade gold intercepts from the Cacao open-pit zone, including:
6.82 g/t Au over 4.56 m ETW in hole LIM-18-4374;
- 4.56 g/t Au over 4.08 m ETW in hole LIM-18-4300.
Drilling returned high-grade gold intercepts from the Atravesada underground target, including:
- 31.38 g/t Au over 2.68 m ETW in hole LIM-18-4302;
- 18.42 g/t Au over 4.07 m ETW in hole LIM-18-4351;
- 51.65 g/t Au over 1.19 m ETW in hole LIM-18-4358.
Drilling returned high-grade gold intercepts from the Panteon underground target, including:
- 10.62 g/t Au over 5.44 m ETW in hole LIM-19-4400;
7.96 g/t Au over 7.17 m ETW in hole LIM-19-4397.
All 2018 and 2019 B2Gold drill results have been incorporated in the most recent resource estimate for El Limon; see Calibre National Instrument 43-101 technical report on El Limon dated Aug. 30, 2019, filed on Calibre's profile on SEDAR.
Russell Ball, chief executive officer of Calibre, stated: "The El Limon district has produced over 3.4 million ounces of gold and I am confident that we are in a truly world-class, low-sulphidation epithermal system. B2Gold's recent drilling intercepted high-grade mineralization over substantial widths and these targets represent an excellent opportunity to expand reserves and resources, both at depth and along strike. Calibre will commence drilling at Limon Norte in early November."
Calibre's initial 7,000-metre drilling program for the fourth quarter of 2019 and 2020 will target extensions at Limon Norte, Tigra-Chaparral and Atravesada. Additional, concurrent target delineation exploration programs will commence at Lourdes, San Antonio and Guanacastal, which will include geological mapping, surface geochemical sampling and trenching for a total cost of approximately $2.9-million (U.S.).
Previous drilling by B2Gold at El Limon focused on a 2.5-kilometre-long section of the El Limon vein system comprising the Limon Sur, Limon Central, Limon Norte, Tigra, Chaparral and Cacao mineralized zones. The drill program included stepout holes designed to test the mineralized system along strike and at depth, as well as a significant amount of infill drilling to upgrade inferred resources to indicated resources.
A total of 20,748 metres were drilled in 116 holes along the El Limon vein system in 2018. Based on the success of the 2018 drilling campaign, B2Gold obtained a mine permit for the El Limon vein on Oct. 5, 2018. Current open-pit production began in December, 2018, at Limon Central.
Other advanced exploration targets, which were drilled in 2018 and 2019, include the Atravesada and Panteon targets, which are located next to existing infrastructure and are extensions to the current underground mining operations, Veta Nueva and Santa Pancha. A total of 7,152 metres were drilled in 36 holes.
Along the current- and past-producing Santa Pancha vein system, 2,110 metres was drilled in 14 holes at the Santa Pancha Sur, Mercedes SW and Hagie targets. In addition, early-stage reconnaissance drill testing programs were completed at the San Antonio, Tecomapas and Ramadas veins totalling 1,898 metres in 21 holes.
El Limon vein -- traced by drilling over 2.5 kilometres
The shallow, northeast-dipping (45 to 50 degrees) central section of the El Limon vein system is characterized by its high grade, good continuity and large vein width of up to 28 metres. A total of 11,095 metres of infill and stepout drilling were completed in 61 holes in 2018. The zone has a current indicated resource of 2.01 million tonnes, grading 4.24 g/t Au, containing 274,000 ounces of gold and a current inferred resource of 1.2 million tonnes, grading 5.83 g/t Au, containing 226,000 ounces of gold (see Calibre NI 43-101 technical report on the El Limon mine, Leon and Chinandego departments, Nicaragua, dated Aug. 30, 2019, filed on Calibre's profile on SEDAR). Production began at Limon Central in December, 2018.
The Limon Central ore shoot has been drilled to a depth of 250 vertical metres with recent positive drill results showing the potential for expansion at depth. Highlights of deep holes drilled within the zone include:
6.66 g/t Au over 12.23 m ETW (LIM-18-4299);
- 3.88 g/t Au over 14.35 m ETW (LIM-18-4309);
5.61 g/t Au over 6.30 m ETW (LIM-18-4295);
3.63 g/t Au over 7.25 m ETW (LIM-18-4303).
Located immediately north of the producing Limon Central zone, Limon Norte is characterized as a shallow, east-northeast-dipping (40 to 50 degrees) vein containing high grade-gold over 20-metre intervals. A total of 2,564 metres of infill and stepout drilling were completed in 18 holes in 2018. The zone has a current inferred resource of 836,000 tonnes, grading 5.43 g/t Au, containing 146,000 ounces of gold (see Calibre NI 43-101 technical report on the El Limon mine, Leon and Chinandego departments, Nicaragua, dated Aug. 30, 2019, filed on Calibre's profile on SEDAR).
The Limon Norte ore shoot has been defined to a depth of 150 vertical metres (60 per cent of the depth of Limon Central) and shows potential for expansion at depth. Highlights of holes drilled in 2018 include:
- 10.82 g/t Au over 20.42 m ETW (LIM-18-4359);
6.54 g/t Au over 12.00 m ETW (LIM-18-4241);
- 4.01 g/t Au over 6.44 m ETW (LIM-18-4310).
Located north of the Limon Norte zone is a shallow, east-northeast-dipping (45 to 50 degrees) vein similar to the Limon Central and Limon Norte zones with high-grade gold over five-metre intervals. A total of 4,676 metres of infill and stepout drilling were completed in 22 holes in 2018. The zone has a current inferred resource of 487,000 tonnes, grading 6.01 g/t Au, containing 94,000 ounces of gold (see Calibre NI 43-101 technical report on the El Limon mine, Leon and Chinandego departments, Nicaragua, dated Aug. 30, 2019, filed on Calibre's profile on SEDAR).
The Tigra-Chaparral zone has been drilled to a depth of 200 vertical metres with two high-grade ore shoots currently open at depth to the north and south. Highlights of deep holes drilled in 2018 include:
17.97 g/t Au over 5.55 m ETW (LIM-18-4281);
9.69 g/t Au over 4.60 m ETW (LIM-18-4232);
42.20 g/t Au over 2.22 m ETW (LIM-18-4272);
- 3.53 g/t Au over 4.61 m ETW (LIM-18-4231).
Shallow, northeast-dipping (50 to 55 degrees) vein located at the northwest end of the El Limon vein system. Recent high-grade drill intercepts have shown similarities to the mineralization observed within the Central and Norte zones. Additional drilling is required to evaluate the potential of this newly discovered extension of the El Limon vein system.
Past-producing, high-grade underground target located 200 metres along strike to the northeast from the Veta Nueva underground operations which currently have an indicated resource of 505,000 tonnes, grading 4.07 g/t Au, containing 66,000 ounces of gold (see Calibre NI 43-101 technical report on the El Limon mine, Leon and Chinandego departments, Nicaragua, dated Aug. 30, 2019, filed on Calibre's profile on SEDAR). A total of 3,570 metres of infill and stepout drilling were completed in 20 holes in 2018.
The Atravesada ore shoot has been drilled to a depth of 200 vertical metres. Mineralization is currently open at depth across the 400-metre-wide ore shoot.
past-producing, northwest-oriented, high-grade underground vein target is located 200 metres to the west of the current- and past-producing Santa Pancha vein system. Panteon is a shallow, northeast-dipping (43 degrees) vein at the southeast end of the trend and may allow for mining from the southern end of the Santa Pancha underground development. A total of 3,582 metres of infill and stepout drilling were completed in 16 holes in 2018 and 2019.
The southeastern section of the Panteon structure has been drilled to a vertical depth of 250 metres and is open at depth across the 150-metre-wide ore shoot.
Gold mineralization at El Limon
Gold mineralization at El Limon is typical of low-sulphidation, epithermal gold vein systems. The mineralization is strongly structurally controlled with veins forming along pre-existing fault planes and occupying extensional openings, which occurred during the time of emplacement. Evidence also exists for significant postmineral movement along localized structures in the form of mineralized tectonic breccias.
Veins are quartz dominant with lesser amounts of calcite and adularia. Pyrite is the dominant sulphide present in quantities less than 1 per cent. Occurring with the pyrite are trace amounts of chalcopyrite, sphalerite, arsenopyrite and gold telluride minerals. Gold is generally very fine grained and is present in multiple events including primary colloform-banded quartz and high-energy, multiphase, silicified breccias that make up the veins. Low-grade gold mineralization can extend tens of metres into the host rock related to auxiliary quartz dominant stringer veinlets.
Current- and past-producing veins are approximately one to two kilometres in length, with widths ranging from less than one metre to greater than 25 metres. Ore shoots along the principal structures extend from 50 metres to greater than 500 metres horizontally and from 50 metres to greater than 300 metres vertically.
The scientific and technical data contained in this news release relating to El Limon have been reviewed and approved by Angela D. Johnson, PGeo, a qualified person as defined by NI 43-101.
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