French Guiana

Maripa

Maripa is located in eastern French Guiana, 50 kilometres south of the capital city of Cayenne, and is comprised of up to five contiguous exploration permits (PER) that cover an area of approximately 120 square kilometres.� Gold has been mined in the area for over a century; the past producing Changement mine, located within the Maripa project area, recorded gold production of some 40,000 ounces of gold from 1985 to 1996.� Past drilling by previous operators between 2002 and 2006 returned the following near-surface drill intercepts:

• 36 metres of 4.3 g/t gold
• 10.5 metres of 12.4 g/t gold
• 34.5 metres of 1.8 g/t gold
• 25.5 meters of 2.5 g/t gold
• 21.5 meters of 2.2 g/t gold

Additional drill results can be found in the table below.

Maripa has the potential to host a significant gold deposit, and unlike many other gold projects in the Guiana Shield, it is located in an area of excellent access with national highway RN2 running through most of the project.

A Maripa project Location Map can be found at the following link:
www.columbusgold.com/i/nr/2018-08-14-map-location.pdf

A Maripa project Claim Map can be found at the following link:
www.columbusgold.com/i/nr/2018-08-14-map-claim.pdf

THE MARIPA PROJECT*

Maripa is situated along the southern border of a regional deformation zone known as the Northern Guiana Trough (NTG), which can be traced across northern French Guiana into neighboring Suriname.� The NTG is recognized as a highly favorable geological setting for gold mineralization; IAMGOLD’s Rosebel mine (13.1 Moz gold) in Suriname is located on the NTG. The geological setting of Maripa is similar to Rosebel, highlighted by a faulted contact between volcanic assemblages of the Paramaca Formation and younger pull-apart basin sediments of the Upper Detrital Unit (UDU, or the Orapu 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 mineralization.

Past Exploration Work at Maripa

Maripa has been subject to several phases of exploration, beginning with the Bureau Minier Guyanais (BMG), from 1958-59, and ending with IAMGOLD, from 2000 to 2006.� Exploration consisted of ground and airborne geophysical surveying, soil and auger grid sampling, geological mapping and rock sampling, trenching, and core drilling. To date, a total of 134 shallow core holes have been drilled (average core length 67 metres), totaling 9,000 metres. Past exploration was successful in delineating several wide zones/shears of gold mineralization along the Paramaca-UDU contact, in the Paramaca volcanics to south of the contact, and within granitic stocks that intrude the Paramaca volcanics. Gold mineralization is associated with quartz and quartz-pyrite veining.

Most of the drilling was conducted by IAMGOLD (106 of the 134 holes) and was focused on five large gold geochemical anomalies, the Changement, Filon Dron, Maripa Sud‑Est, Rhyodacite and Filon Scieur targets. Although first pass drilling of these targets was limited to shallow depths within the oxidized saprolite layer, all five targets returned drill intersections of economic interest with demonstrated potential for expansion and mineral resource delineation. Additionally, several large gold geochemical anomalies remain untested.

Past exploration work conducted at Maripa provides Columbus with an excellent base of geological, geochemical and geophysical data to advance Maripa to the drill definition stage in 2019.�

Table: Maripa Exploration Highlights

SUMMARY OF PRINCIPAL AGREEMENT TERMS

Two-stage option to earn up to a 70% interest in the Maripa Project:

• Initial option (the “First Option”) to acquire a 50% interest by incurring US$5M in expenditures within 5 years of the effective date of the Agreement, with Columbus acting as Operator:

• Firm spending commitment of US$200,000 by December 31, 2018;
• US$1.5M firm cumulative spending commitment by 2nd anniversary of the Effective Date;
• US$2.75M cumulative spending by 3rd anniversary of the Effective Date;
• US$4M cumulative spending by 4th anniversary of the Effective Date;
• US$5M cumulative spending and the completion of an internal scoping study by the 5th anniversary of the Effective Date.

• Election to acquire an additional 20% interest:

• Following exercise of the First Option, the parties may form a 50/50 joint-venture (JV), or if IAMGOLD elects not to participate in the 50/50 JV, then Columbus may provide notice to IAMGOLD that it will aim to earn an additional 20% interest by completing a Preliminary Feasibility Study (PFS) in an additional 3 years;
• A 70:30 JV will be formed upon completion of a PFS by Columbus.

• If any party’s interest in a JV falls below 10% it will convert to a 2% NSR, of which 1% can be purchased by the other party for US$3M.

* The source of the Maripa technical information was obtained from IAMGOLD’s filing documents.

Qualified Person
Rock Lefran�ois, President & COO for Columbus Gold and Qualified Person under National Instrument 43-101, has reviewed the technical content of this page.

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