Continental Gold Inc. (TSX:CNL; OTCQX:CGOOF) yesterday announced high-grade assay results from the initial 12 holes drilled into BMZ4, a new discovery located in the eastern-most part of the Yaraguá system at its 100%-owned Buriticá project in Antioquia, Colombia. Continental Gold plans to drill up to 73,500 meters in 2019, consisting of approximately 55,000 meters of capitalized definition drilling and approximately 18,500 meters of exploration drilling targeting broad mineralized zone (“BMZ”) targets. Supporting information for results discussed in this release can be found in Table 1 and Figures 1 and 2.
- Twelve surface diamond drill-holes were completed into the far east portion of the Yaraguá system to test if a new broad mineralized zone (“BMZ4”) exists in this location. The target was generated on the hypothesis that the Tonusco Fault, located at the eastern edge of the Yaraguá system, is a fluid conduit for precious metal deposition in its vicinity and such deposition would specifically be pronounced at the junction where the Centena vein crosses the Murciélagos master vein family.
- The discovery hole, BUSY407, intercepted multiple continuous high-grade zones through the BMZ4 structure at an excellent angle to the geometry of the zone with results including:
- 12.30 meters @ 10.17 g/t gold and 4.4 g/t silver (BUSY407)
- 8.70 meters @ 6.49 g/t gold and 57.2 g/t silver (BUSY407)
- Each hole sequentially drilled following the discovery hole (BUSY407) intercepted BMZ4 at or near perpendicular angles to the strike of the zone. Additionally, the majority of the holes intercepted more than one thick interval of remarkably continuous mineralization within the zone. Narrow bands of visible gold were also observed. Key results are as follows:
- 15.50 meters @ 7.03 g/t gold and 9.1 g/t silver (BUSY409)
- 14.75 meters @ 4.82 g/t gold and 15.4 g/t silver (BUSY410)
- 5.65 meters @ 18.69 g/t gold and 38.7 g/t silver (BUSY411)
- 11.45 meters @ 8.24 g/t gold and 17.3 g/t silver (BUSY412)
- 5.10 meters @ 17.32 g/t gold and 39.6 g/t silver (BUSY415)
- 27.90 meters @ 7.04 g/t gold and 7.5 g/t silver (BUSY416)
- 7.55 meters @ 7.66 g/t gold and 12.4 g/t silver (BUSY417)
- BMZ4, which is located approximately 60 meters east of BMZ2 in the eastern portion of the Yaraguá system, has been intersected by drilling for more than 200 vertical meters and measures between 25 – 45 meters in thickness. Mineralization encountered in BMZ4 is expected to add new ounces to the multi-million-ounce global mineral resource inventory for the project. BMZ4 remains open at depth with extension drilling currently underway. Three diamond drill rigs are actively turning on this promising new discovery.
- In light of this new discovery, initially definition drilling will start into the very upper part of BMZ4 where underground development has been advancing in the upper eastern Yaraguá area with a crosscut to the Murciélagos vein. The zone will be more intensively drilled as a ramp is developed deeper in this area and additional drill chambers constructed. Continental Gold expects to incorporate ongoing results from BMZ4 into the mine plan and will be looking to design wider stopes with potential to use bulk-style mining, including transverse extraction using primary and secondary stopes.
“Discovering BMZ4 is an excellent outcome for Continental Gold and our geology team deserves credit for successfully proving the concept with drilling,” commented Ari Sussman, CEO (pictured above, center). “BMZ4 continues to highlight the upside at Buriticá as this discovery will ultimately add high-grade ounces to the global mineral resource inventory of the project. More importantly, we are hopeful that we will be able to successfully delineate new stopes in this area and be producing gold from the zone in 2020.”
Two diamond drill holes were completed in the eastern-most area of the Yaraguá system. The initial two holes, BUSY405 and BUSY406, were drilled too far east and consequently passed through the Tertiary dioritic intrusion host rock of the Yaraguá system into the Tonusco fault before finally passing into Cretaceous basalt on the eastern side of the fault and out of the system. BUSY408 ran into technical difficulties and was abandoned shortly after coring reached 32 meters down hole. The remaining 10 drill holes (BUSY407 and BUSY409-417) all successfully intercepted high-grade gold over varying thicknesses in BMZ4 with drill intercepts over 200 vertical meters in elevation. BMZ4 remains open in high-grade mineralization at depth.
The majority of the drill holes intersected more than one continuous run of thicker mineralization; all broad intervals encountered demonstrated excellent continuity at 1 g/t gold or greater along the axis of the hole. Additionally, detailed core logging of holes indicates that the orientation of drilling was done at or near perpendicular angles to the strike of the mineralized structures of BMZ4.
Three diamond rigs are now actively drilling BMZ4 and will continue to test the depth extension potential of the zone. Additionally, drilling from underground development recently excavated close to BMZ4 will allow more intensive definition drilling to commence shortly. Finally, results from the intensive definition drilling will allow Continental Gold’s mine planning team to begin preliminary designs for BMZ4 in order to assess the potential for mining the zone early in the production schedule. A particular focus in this work will be to evaluate the potential to use bulk-style mining, including transverse extraction using primary and secondary stopes.
Assay results for all drill-holes reported in this release are reported in the table below:
Table I: Drill Hole Results
* Intercepts calculated at a composite 4.8 grams X metre gold equivalent for minimum intervals of 0.5 meters, with generally no more than 10% internal dilution.
** Grades herein are reported as uncapped values. Gold equivalent in this release and table was calculated at Au:Ag ratio of 1:75 with no assumptions made for metallurgical recovery rates.
*** True widths for intercepts of modelled veins outside of the BMZs are estimated to be between 75-100%. Mineralization intercepted with BMZ4 is generally estimated to be within 70-100% of true widths.
Figure 1 – Plan View of Drilling in Eastern Yaraguá System Targeting BMZ4
Figure 2 – Cross Section A-A’ of Drilling into BMZ4
Geological Description of the Buriticá Project
Continental’s 100%-owned, 75,583-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 meters of strike and 1,800 vertical meters and partially sampled in underground developments. The Veta Sur system has been drill-outlined along 1,300+ meters of strike and 1,800 vertical meters 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, Continental Gold has identified up to seven BMZ targets for testing and will systematically drill each target zone as underground mine development advances.
BMZ4 is a three-dimensional orebody interpretation and modelling with variability in width, thickness along a vertical extension. Additional core drilling is been planned to define its characteristics, such as gold/silver grades, geometry and geomechanical properties.
Mauricio Castañeda, Vice-President, Exploration of Continental Gold (pictured above, right) and a Qualified Person for the purpose of Canadian National Instrument 43 101 (“NI 43 101”), has prepared or supervised the preparation of, or approved, as applicable, the technical information contained in this press release.
Besides rigorous chain-of-custody procedures, Continental Gold 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.
For exploration and infill core drilling, Continental Gold applied its standard protocols for sampling and assay. HQ and NQ core is sawn or split with one-half shipped to a sample preparation laboratory in Medellín run by ALS Colombia Limited (“ALS”), 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.
Continental Gold does not necessarily 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 “NI 43‐101 Buriticá Mineral Resource 2019‐01, Antioquia, Colombia” and dated March 18, 2019 with an effective date of January 30, 2019, led by independent consultants Ivor Jones Pty Ltd. The technical report is available on SEDAR at www.sedar.com, on the OTCQX at www.otcmarkets.com and on Continental Gold website at www.continentalgold.com.