Continental Gold Inc. (TSX:CNL) (OTCQX:CGOOF) is pleased to announce additional high-grade assay results from underground channel sampling results and six holes drilled into the Yaraguá system as part of its 2018 exploration drilling and underground channel sampling program at its 100%-owned Buriticá project in Antioquia, Colombia. The Company presently has 14 diamond drill rigs in operation; three rigs are being utilized for the recently-started stope definition drilling program, eight rigs are conducting infill and mineral resource expansion drilling at the Yaraguá and Veta Sur deposits and three rigs are testing the Laurel and Perseus greenfield targets.
“The Buriticá project continues to demonstrate its prowess as a rare world-class system, both in terms of its size and high grades. The system is so vast that it will take years of drilling to determine just how many ounces of gold will ultimately be mined from the Yaraguá and Veta Sur deposits,” stated Ari Sussman, CEO. “With the new results announced herein, the Yaraguá system now measures 1,350 metres laterally by 1,800 metres vertically and remains open in all directions for expansion. We look forward to incorporating all new results into an updated mineral resource estimate and mine plan in Q1 2019.”
Detail Summary (see Table 1 and Figures 1, 2 and 3)
A fan of six diamond drill holes were completed from an underground chamber installed off of the main Yaraguá ramp currently advancing ahead of planned commercial production for the Buriticá project in 2020. Drilled to the northeast, the fan of holes had the dual purpose of infilling an eastern section of the Yaraguá deposit as well as testing for extensions to the system along the San Antonio master vein family. Drilling covered 150 metres of lateral strike by 475 metres vertically and mineralized zones reported below remain open both up and down-dip for extensions.
Four distinct zones of mineralization were outlined from the drilling. The first two mineralized zones, located at shallow distances from the drill hole collars, successfully infilled seven veins within the Murcielagos vein family at the eastern edge of the mineral resource estimate block model. Impressively, the precious metal content is more than 125% higher on a weighted average grades X true widths basis than the mineral resource estimate block model. As a result, the Company is accelerating drilling plans on this section with an aim of sequencing mining into the early years of production.
The third zone of mineralization encountered extended the strike length of the HW and San Antonio veins up to 100 metres to the east, with highlight results as follows:
Given the high-grade nature and easy access from ongoing mine development, plans are being made to access this area of eastern Yaraguá for definition drilling anticipated to begin in Q1 2019.
The fourth zone of mineralization encountered in hole BUUY397 successfully extended the strike length of the FW vein and/or the VND vein 125 metres to the east, with assay results as follows:
Subsequent to the Company’s October 1, 2018 announcement of drift sampling results, drifting has continued along the HW vein and the San Antonio vein in the Yaraguá system located directly to its north in broad mineralized zone #1 as shown in Figure 3. Significantly higher grades and wider exposures continue to be encountered to the southwest along the HW vein, which has been extended 16 metres for a total 37 metres from CX-04 crosscut. Additionally, development to the east in theSan Antonio and HW vein drifts continues to expose strongly wide, high-grade zones. East in San Antonio, significant mineralization has been extended 15 metres for a total 20 metres from CX-04 crosscut. East in HW vein, significant mineralization has been extended 11 metres for a total 39 metres from CX-04 crosscut. The Company plans to advance a crosscut northward from the west drift (GA9551W) on the HW vein to intersect the San Antonio vein projection. This will also allow the Company to assess mineralization between the two veins in the BMZ1 at this location. Once completed, the Company will use the new information to prepare the updated mineral resource estimate, which can then be used when preparing stope designs for the mine study anticipated for release in Q1 2019. BMZ1 can be scheduled, along with other identified BMZ areas, for extraction early in the mine production schedule. Sampling results from the extended drifting have been incorporated with the sampling results announced October 1, 2018 to provide:
The results on the HW vein are significantly higher grades with wider exposures than the mineral resource estimate block model as follows:
(g X m)
(g X m)
|(1)||Represents difference between block model and the true horizontal width of the crosscut on a grams x metre basis|
|(2)||Channel chip samples are taken along the walls of the underground crosscuts and across the face of the underground drifts with vein exposures|
Stope definition drilling for BMZ1, at 10×10-metre spacing, is now underway with first results anticipated in November 2018.
Table I: Drill Hole Results
|*||Intercepts calculated for minimum intervals of 0.5 metres|
|**||Grades herein are reported as uncapped values|
Geological Description of the Buriticá Project
Continental’s 100%-owned, 75,023-hectare project, Buriticá, contains several known areas of high-grade gold and silver mineralization, of base metal carbonate-style (“Stage I”) variably overprinted by texturally and chemically distinctive high-grade (“Stage II”) mineralization. The two most extensively explored of these areas (the Yaraguá and Veta Sur systems) are central to this land package. The Yaraguá system has been drill-outlined along 1,350 metres of strike and 1,800 vertical metres and partially sampled in underground developments. The Veta Sur system has been drill-outlined along 1,000+ metres of strike and 1,800 vertical metres and has been partially sampled in underground developments. Both systems are characterized by multiple, steeply-dipping veins and broader, more disseminated mineralization and both remain open at depth and along strike, at high grades.
The BMZ consists of a group of modelled precious metal-bearing veins in the current mineral resource estimate block model with mineralization occurring between these veins, generally in the form of veinlets at oblique angles to strike. The majority of the mineralization between modelled veins is not in the current mineral resource estimate, providing potential upside both in terms of identifying significantly broader and more productive zones for mining and increased mineral resources. To date, the Company has identified up to seven BMZ targets for testing and will systematically drill each target zone as underground mine development advances. BMZ1 encompasses a matrix of the east-west trending FW, San Antonio and HW veins as well as a package of a NW‑SE vein and subsidiary veinlets.
Mauricio Castañeda, Vice-President, Exploration of the Company and a Qualified Person for the purpose of NI 43‑101, has prepared or supervised the preparation of, or approved, as applicable, the technical information contained in this press release.
Reported intervals include minimum weighted averages of 3 g/t gold equivalent (70:1 Au/Ag) over core lengths of at least 1.0 metres. Assays are uncut except where indicated.
Underground development along the veins was sampled by trained crews under the direct supervision of mine geologists. The sampling consisted of channel samples that were taken by hammer and chisel across the full width of the face every 3 metres along strike, or along the rib of the drift continuously at selected locations. Distinct geological zones were sampled separately (vein separate from wall rock), with minimum-maximum horizontal sample widths of 0.2 to 1.0 metres. The widths of the channels were adjusted so that each sample weighed between approximately 2 to 8 kilograms. Sample locations were measured from a surveyed control point. Duplicate channel samples were collected with a frequency of one every 25 samples. Bar code tags were inserted into the individual sample bags by the geologist, including duplicates which were numbered in sequence with the primary samples. The bags were then secured with a cable tie and transported out of the mine by the sampling crew to a secure staging area on surface using a procedure supervised by the Mine Geologist and Chief Geologist. Channel samples were prepared and analyzed at Continental’s Yaraguá mine laboratory at Buriticá, Colombia. Blanks, field duplicates from each heading, pulp duplicates, check assays and analysis of results using industry-accepted best practices and certified reference standards are inserted into the sample stream to monitor laboratory performance. Channel samples were analyzed using a 50-gram gold fire assay with gravimetric finish. All silver values were determined by four acids digestion and atomic absorption method.
Besides rigorous chain-of-custody procedures, the Company utilized a comprehensive quality control/quality assurance program for the channel samples. All quality control anomalies were addressed and/or corrected as necessary to assure reliable assay results; no material quality control issues were encountered in the course of the program. Crush rejects and pulps are kept and stored in a secured storage facility for future assay verification. Although historic correlation between analytical results from the Company’s internal laboratory and certified independent laboratories for gold and silver analysis have been within acceptable limits, the Company’s internal laboratory is neither independent nor certified under NI 43-101 guidelines and, as such, channel sampling results in this release should only be taken by the reader as indicative of future potential.
For exploration and infill core drilling, the Company applied its standard protocols for sampling and assay. HQ and NQ core is sawn or split with one-half shipped to a sample preparation lab in Medellín run by ALS Colombia Limited in Colombia, whereas BQ core samples are full core. Samples are then shipped for analysis to an ALS-certified assay laboratory in Lima, Peru. The remainder of the core is stored in a secured storage facility for future assay verification. Blanks, duplicates and certified reference standards are inserted into the sample stream to monitor laboratory performance and a portion of the samples are periodically check assayed at SGS Colombia S.A., a certified assay laboratory in Medellín, Colombia.
For stope definition core drilling, the Company applied its standard protocols for sampling and assay. The HQ3 samples were full core and provided sample widths between 0.2 to 1.0 in metres weighing approximately 2 to 8 kilograms. Custody of the Samples were transferred at the mine site to Actlabs Colombia using rigorous chain-of-custody procedures. Full-core HQ3 samples are prepped and analyzed at Actlabs Colombia’s ISO 9001 accredited assay in Medellín, Colombia. The remainder of crushed rejects and pulps are stored in a secured storage facility for future assay verification. Blanks, pulps duplicates, coarse duplicates and purchased certified reference standards are inserted into the sample stream to monitor laboratory performance. A portion of the samples are periodically check-assayed at ALS Peru’s ISO 9001 accredited assay laboratory in Lima, Peru.
The Company does not receive assay results for drill holes in sequential order; however, all significant assay results are publicly reported.
For information on the Buriticá project, please refer to the technical report, prepared in accordance with NI 43‑101, entitled “Buriticá Project NI 43–101 Technical Report Feasibility Study, Antioquia, Colombia” and dated March 29, 2016 with an effective date of February 24, 2016, led by independent consultants JDS Energy & Mining Inc. The technical report is available on SEDAR at www.sedar.com, on the OTCQX at www.otcmarkets.com and on the Company website at www.continentalgold.com.
About Continental Gold
Continental Gold is the leading large-scale gold mining company in Colombia and is presently developing it’s 100% owned Buriticá project in Antioquia. Buriticá is one of the largest and highest-grade gold projects in the world and is being advanced utilizing best practices for mine construction, environmental care and community inclusion. Led by an international management team with a successful record of discovering, financing and developing large high-grade gold deposits in Latin America, the Buriticá project is on schedule with first gold pour anticipated during the first half of 2020.
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