Columbus Announces Additional High-Grade Gold Discoveries and Completion of Airborne Geophysical Survey at Maripa Project, French Guiana
Vancouver, BC, Canada, November 26th, 2019. Columbus Gold Corp. (CGT: TSX, CGTFF: OTCQX) (“Columbus”) is pleased to provide an update on the 2019 exploration program at the Maripa gold project (“Maripa”) located in French Guiana. Columbus has an option to acquire up to a 70% interest in Maripa.
- Prospecting in the northern half of Maripa led to the discovery of 4 new quartz-gold vein systems exposed by artisanal mine workings (Site #1 to #4) in the vicinity of the Changement and Filon Dron gold zones:
- Site #1, located 150 metres west of Filon Dron, was initially reported in a news release dated September 26, 2019. Sampling of mine stockpiles had returned best assays of 86.80 and 5.84 g/t gold. New sampling of outcrops and mine stockpiles at Site #1 returned a best assay of 11.45 g/t gold.
- Site #2, located 800 metres south of the past producing Changement mine, was reported in a news release dated October 31, 2019. Sampling of mine stockpiles returned best assays of 115.70, 83.48, 68.43, 42.60, 29.57, 15.51, 14.70, 9.42, 6.04 and 5.98 g/t gold;
- Site #3 is located 100 metres to the north-northwest of Site #2 and potentially represents the north extension of this structure. Sampling of mine stockpiles returned best assays of 52.33, 16.99, 14.64, 14.50, 9.75, 7.36 and 6.83 g/t gold.
- Site #4 is located 450 metres west of Filon Dron. Sampling of rock exposures at the mine workings and mine stockpiles returned best assays of 15.22 and 13.07 g/t gold.
- The newly identified gold mineralised structures remain untested by drilling.
- A high-resolution magnetic and radiometric heliborne geophysical survey was completed on November 7th (news release dated October 23, 2019). The survey covered 256 square kilometres at a 100-metre line spacing, centred and extending beyond the limits of Maripa.
Maripa and north half of Maripa compilation maps are available at the following links:
The initial exploration phase at Maripa prioritised Changement and Filon Dron, two of the five partially drill-defined gold zones at Maripa, for comprehensive evaluation, extension drilling and resource definition. Prospecting in and around the Changement and Filon Dron gold zones was initiated in late June in preparation for drill programs to commence in early 2020. Field investigation of microrelief anomalies recorded by the 2018 airborne Lidar topographic survey identified four (4) abandoned sites artisanal mine workings (Site #1 to #4) that expose previously unrecognized quartz-gold vein systems.
Since June, a total gold of 158 select rock samples and 50 channel samples (Site #3, AG1 trench) were collected during the field work. Gold assay results were received for all samples. Results from the initial prospecting at Sites #1 and #2 were disseminated in news releases dated September 26, 2019 and October 31, 2019, respectively.
Past exploration and recent field work conducted by Columbus has now identified five sub-parallel quartz-gold vein systems in the northern half of the Maripa property (Changement, Site #2-3, Filon Dron, Site #1 and Site #4), defining a northerly trending gold mineralised structural corridor of up to 450 metres wide. The gold mineralised vein systems are localised within north to north-northwest striking sub-vertical shear zones and associated moderately east- and west-dipping conjugate shear-tension structures. The newly identified quartz-gold vein systems remain untested by drilling.
Site #1 was initially identified by prospecting the Filon Dron discovery area. Ten (10) samples had been collected at Filon Dron and 20 samples at Site #1. The material sampled was primarily from stockpiles extracted from the mine workings. Best assays of 86.80 and 5.84 g/t gold were obtained at Site #1. More recently, five (5) additional samples taken from outcrops and mine stockpiles at Site #1 returned best assays of 11.45 and 3.96 g/t gold.
Site #3 is located 100 metres to the north-northwest of Site #2 and potentially represents the north extension of this structure. Nine (9) mine shafts and 2 mine adits were found over a strike extent of 90 metres along the structure. Gold assay results were received for 24 select samples of mineralised quartz veins and wall rock collected from stockpiles extracted from the mine workings. Eleven (11) of the 24 samples returned gold values above 1 g/t gold, including 7 higher grade values of 52.33, 16.99, 14.64, 14.50, 9.75, 7.36 and 6.84 g/t gold.
Also, an old trench (AG1) located at the south end of the mine workings was systematically sampled at 1-metre intervals and returned a gold mineralised interval of 1.20 g/t gold over 18.4 metres.
In early November, another site of artisanal mine workings was identified 450 metres to the west of Filon Dron. Twelve (12) mine shafts and 2 mine adits were found over a 200-metre by 50-metre area. The previously unrecognised vein system was extensively worked over a strike extent of 200 metres. Gold assay results were received for 7 select samples of mineralised quartz veins and wall rock taken from rock exposures at the mine workings and material collected from stockpiles extracted from mine workings. Five (5) of 7 samples returned values above 1 g/t gold, including 15.22 and 13.70 g/t gold.
A 1.5-metre wide mineralised quartz vein and pyritized wall rock was recently exposed at the site of the Filon Dron discovery. Gold assay results were received for 8 samples of the quartz vein and/or wall rock collected from the outcroppings. Four (4) of the 8 samples returned values above 1 g/t gold, including 13.13 g/t gold.
Complete gold assay results for the samples collected at Filon Dron and Sites #1 to #4 are available at the following link:
About the Changement and Filon Dron Gold Zones
The Changement area was subject to placer gold mining from 1859 to 1950. All creeks peripheral to the deposit have been worked over time. Underground hard rock mining was recorded as early as 1880 and the deposit was exploited at surface by three small open pits from 1985 to 1996. Total declared historical placer and hard rock gold production is estimated to be approximately 100,000 ounces. The Changement gold mineralisation is localised within two subparallel north-northwest striking, moderately west dipping, shear zones of 10 to 25 metres in width cutting Paramaca Formation mafic volcano-sedimentary sequences. Gold mineralisation is associated with quartz veining and sulfides, mainly as pyrite. The deposit has been traced by drilling to shallow depths over a lateral distance of 1,250 metres. A total of 63 core holes (4,500 metres) were drilled by the French geological survey (BRGM, 1978-1998) and IAMGOLD (2002-2004).
The Filon Dron prospect, located in the central part of the Maripa property, is centred over a 2,800 metre by 800 to 1,100 metre gold-in-soil anomaly, straddling the contact between volcanic assemblages of the Paramaca Formation and younger pull-apart basin coarse detrital sediments of the Upper Detrital Unit (UDU or Rosebel Formation). The initial discovery drill program at Filon Dron, consisting of 7 shallow core holes carried-out by IAMGOLD in 2006, was limited to a 400-metre by 200-metre area of the extensive gold-in-soil anomaly. Two (2) of the 7 cores holes returned important gold mineralised intersections within the surface weathered saprolite layer of 2.45 g/t gold over 25.5 metres, including 3.17 g/t gold over 13.5 metres (MAR 06 007), and 4.18 g/t gold over 36.0 metres, including 7.17 g/t gold over 18.0 metres (MAR 06 008), defining a wide gold mineralised zone striking north-northwest, parallel to the local stratigraphic and structural trend. Several other subparallel gold mineralised zones untested by drilling are interpreted from historical surface geochemical data, defining a 1,500-metre wide north-northwest trending gold mineralised corridor.
About the Maripa Gold Project
Columbus entered into an agreement in July 2018 with IAMGOLD Corporation (“IAMGOLD”) to acquire up to a 70% interest in Maripa. Maripa adjoins to the south the Boulanger project being developed by Reunion Gold, where a recent high-grade gold discovery was reported.
Maripa is located in eastern French Guiana along a paved national road, approximately 50 kilometres south of the capital city of Cayenne. The project is comprised of up to five (5) contiguous exploration permits that cover an area of 120 square kilometres.
Maripa is situated along the southern border of a regional deformation zone known as the Northern Guiana Trough (NGT), which can be traced across northern French Guiana into neighboring Suriname. The NGT is recognized as a highly favorable geological setting for gold mineralisation. The geological setting at Maripa is similar IAMGOLD’s Rosebel gold mine (15.2 Moz) in Suriname, highlighted by a faulted contact between volcanic assemblages of the Paramaca Formation and younger pull-apart basin coarse detrital sediments of the Upper Detrital Unit (UDU or Rosebel Formation). The presence of thick sections of UDU sediments in the Maripa area attest to an extensional structural regime favorable to hydrothermal activity and associated gold mineralisation.
Past exploration at Maripa includes 134 core holes, for a total of 9,000 metres, which partially defined five (5) broad gold zones, namely Changement, Filon Dron, Maripa Sud-Est, Rhyodacite and Filon Scieur. Drilling was limited to shallow depths within the oxidized saprolite layer with all five prospects returning drill intersections of economic interest with demonstrated potential for expansion and mineral resource delineation including: 4.3 g/t gold over 36 metres; 12.4 g/t gold over 10.5 metres; 1.8 g/t gold over 34.5 metres, 2.5 g/t gold over 25.5 metres and 2.2 g/t gold over 21.5 metres.
Technical Info and Qualified Person
Samples collected by Columbus geologists during prospecting were sealed in individual heavy duty cellophane plastic bags and placed by batch in sealed polypropylene bags and delivered by Columbus personnel to the Filab-Amsud depot in Cayenne for trucking to the Filab-Amsud laboratory in Paramaribo, Suriname, an accredited laboratory for quality procedures according to ISO 9001(2008) and ISO/IEC 17025. Samples were assayed for gold by the fire-assay method using an atomic absorption finish on a 50-gram pulp split.
A quality assurance and quality control program (QA/QC) was implemented by Columbus and FilabAmsud to ensure the accuracy and reproducibility of the analytical method and results. Samples returning values above 10 g/t Au by fire-assay method were re-analysed with a gravimetric finish on a second 50-gram pulp split.
The field work was conducted under the supervision of Rock Lefrançois, President & Chief Executive Officer of Columbus and Qualified Person under National Instrument 43-101, who has reviewed this news release and is responsible for the technical information reported herein, including verification of the data disclosed.
Columbus is French Guiana’s leading gold exploration and development company. Columbus holds a major interest in the world-class Montagne d’Or gold deposit. A feasibility study for Montagne d’Or was filed in May 2017, and the mine permitting process is currently underway. In addition, Columbus is also earning into the Maripa gold exploration project, where past drilling has returned excellent near surface results, including 36 metres of 4.3 g/t gold. Columbus’ objective is to assemble a portfolio of high-quality gold exploration projects in the highly prospective and underexplored Guiana Shield.
ON BEHALF OF THE BOARD,
President & CEO
For more information contact:
(604) 634-0970 or
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