Gran Colombia Gold Corp. (TSX: GCM) (OTCQX: TPRFF) is pleased to announce results from the recently completed Phase 2 diamond drill program at its 100%-owned Toroparu Project in Western Guyana. The 10,494 meters Phase 2 program was designed to confirm the continuity of both the northwest oriented high-grade gold structures and the cross cutting east-west high-grade structures that create a repeatable pattern of intersecting zones amenable to underground mining methods over the 4 kilometer strike length of the Toroparu Project1.
Serafino Iacono, Executive Chairman of Gran Colombia, commented, “The discovery of the structural control of high-grade gold mineralization at Toroparu has reaffirmed our confidence in the potential value of this project as one of our cornerstone assets. The recently completed, two-phase diamond drill program comprised a total of 20,750 meters in 114 drill holes and has confirmed a 4-kilometer strike length of high-grade structurally controlled gold mineralization at Toroparu. In addition, the program identified a repeated pattern of intersections of NW-SE and E-W oriented sub-vertical structures containing high-grade zones extending over mineable widths up to 100 m vertically (“jewelry boxes”)2 that support our belief that a high-grade resource amenable to underground mining methods lies at the core of this very large, disseminated gold deposit. We are currently working with Nordmin to prepare an updated mineral resource estimate and preliminary economic assessment (“PEA”) incorporating the high-grade results from this latest drilling program. We expect the PEA will be completed later this summer.”
Figure 1: 2020/2021 Drill Results
2021 Phase 2 Drill Program – Drill Result Highlights (Figures 1 through 8)
Significant intercepts were encountered in 27 of the 42 holes drilled. Highlights of best intercepts are presented in table below:
|Hole||From (m)||To (m)||Width (m)||Weighted Avg. Au Grade (g/t)|
Figure 2: Plan View of 2020/2021 Drill program and Corresponding Cross-Sections
High-grade gold-mineralized intercepts within the deposit are associated with the occurrence of native gold, sulfides, and quartz-carbonate veins or veinlets that crosscut most lithologies except for late-stage mafic dikes. Additionally, the geologic structural model is validated by structural measurements from 2020 and 2021 oriented core measurements that indicate an orientation of NW-SE and an overprinting orientation of E-W in the Toroparu Deposit Main and Northwest Areas. Figure 3 illustrates 2020 and 2021 drill intersections greater than 5 g/t Au.
Figure 3: 2020/2021 Drilling High-Grade Intersections > 5 g/t Au
Figures 4 through 8 present the geological model in cross-section (see Figure 2 for section locations) with results from the 2021 drill programs highlighting the continuity of gold mineralization within the high-grade NW-SE and E-W structures.
Each of these sections illustrate the high-grade NW-SE and E-W structural wireframes which are surrounded by a lower-grade halo (> 0.2 g/t Au) in the block model. Collectively, these assay results and historically drilled intercepts confirm the Nordmin/HPX Geological Model and potential for development of Underground Resources at Toroparu.
Figure 4: High-Grade Drilling Program Cross-Section, Main Area (A-A’)
Figure 5: High-Grade Drilling Program Cross-Section, Main Area (B-B’)
Figure 6: High-Grade Drilling Program Cross-Section, NW Area (C-C’)
Figure 7: High-Grade Drilling Program Cross-Section, NW Area (D-D’)
Figure 8: High-Grade Drilling Program Cross-Section, NW Area (E-E’)
The 2021 diamond drilling program consisted of 10,494 m of drill core from 42 holes (TPD540 through TPD580) drilled to lengths of up to 640 m. Core samples for the drill program were collected over 0.5 m to 1.0 m intervals within the mineralized zone and 1.5 m intervals in the barren intervals. The sampling has been driven by sulfides content, quartz carbonate vein density, and lithological discrimination of barren mafic dikes. Half-core was submitted to MS Analytical Labs in Georgetown, Guyana for analysis. Gold was analyzed by fire assay atomic absorption reading and gravimetric reading greater than 10 ppm. A standard quality control procedure has been applied including blanks, standards, and duplicates.
The total cumulative diamond drilling on the Upper Puruni Concession as of July 6, 2021 is 245,693 m in 1,091 diamond drill holes (“DDH”) including 600 DDH totaling 199,223 meters drilled at Toroparu and 184 DDH totaling 21,963 m drilled at Sona Hill.
Qualified Persons Review
This release was independently prepared under the supervision of Mr. Glen Kuntz, P.Geo. (Ontario) of Nordmin Engineering Ltd., a “Qualified Person” under National Instrument 43-101 Standards of Disclosure for Mineral Projects, who consents to the inclusion of his name in this release.
About Gran Colombia Gold Corp.
Gran Colombia is a mid-tier gold producer with a proven track record of mine building and operating in Latin America. In Colombia, the Company is currently the largest underground gold and silver producer with several mines in operation at its high-grade Segovia Operations. In Guyana, the Company is advancing the Toroparu Project, one of the largest undeveloped gold projects in the Americas. Gran Colombia also owns approximately 44% of Aris Gold Corporation (TSX: ARIS) (Colombia – Marmato), an approximately 27% equity interest in Denarius Silver Corp. (TSX-V: DSLV) (Spain – Lomero-Poyatos; Colombia – Guia Antigua and Zancudo) and an approximately 26% equity interest in Western Atlas Resources Inc. (TSX-V: WA) (Nunavut – Meadowbank).
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We acknowledge the [financial] support of the Government of Canada.