Detour Gold Corporation (TSX: DGC) reports an initial independent mineral resource estimate for the Zone 58N gold deposit located six kilometres south of its 100% owned Detour Lake gold mine.

The mineral resource estimate is comprised of an Indicated resource of 2.87 million tonnes grading 5.80 g/t for 534,300 ounces of gold and an Inferred resource of 0.97 million tonnes grading 4.35 g/t for 136,100 ounces of gold.

Michael Kenyon, Interim CEO, commented: “Detour Gold is in the fortunate position of having a large mineral reserve base of 16.0 million ounces supporting a mine life of 23 years. The strategy undertaken over the last few years in advancing Zone 58N is to leverage the infrastructure we have in this prospective gold camp by finding high grade satellite deposits within trucking distance to our mill. With this initial resource at Zone 58N, which remains open at depth, and other prospective targets we have identified in our exploration programs, we are beginning to demonstrate the benefits of this strategy, and look forward to further advancing Zone 58N and other future discoveries on our large 647 km² land position.”

The resource estimate for Zone 58N incorporates the assay results from 332 diamond drill holes totaling 109,700 metres. Drill spacing is approximately 25 x 25 metres in the upper 500 metres of the deposit and 40 x 40 metres below 500 metres. The mineral resource model only considers mineralized zones that are potentially mineable by underground extraction and contained within the modelled wireframes. The block model was prepared and constrained using 3D wireframes of geological domains that are associated with gold mineralization. Grade estimation was interpolated into blocks using a combination of Inverse Distance Cubed (ID3) and Nearest Neighbor (NN). The mineral resource was reported using a gold cut-off grade of 2.2 g/t and a minimum true thickness of 3 metres.

The gold mineralization within Zone 58N is hosted in a swarm of tonalitic dykes that intrude mafic volcanic rocks and are spatially controlled by the margin of a large intermediate intrusion. Gold mineralization is found in quartz-tourmaline-carbonate veins containing less than 5% sulphides. The east-west mineralized system extends along a strike length of 450 metres, from surface to a depth of 800 metres. It remains open for expansion at depth.

Metallurgical testing performed on a total of 31 composites has confirmed that Zone 58N mineralization is amendable for processing through the existing Detour Lake processing plant. All composites were tested for grinding, gravity separation and cyanide leaching of both gravity products (concentrate and tails). Based on these initial tests, gold recovery is estimated at 97.5% for the stated mineral resource grade.

To view Zone 58N figures, click on the following link:

https://www.detourgold.com/operations/exploration/default.aspx

Further details regarding Zone 58N mineral resource will be included in the Technical Report to be filed for the updated life of mine plan for the Detour Lake operation.

Next Steps

The Company is proceeding with a cost evaluation for an advanced underground exploration program. This program would include site access and surface infrastructure, and underground development (i.e. access to mineralized zones and platform for further exploration drilling). Subject to a positive evaluation, the Company would determine the appropriate timeline for the program.

Qualified Persons

The mineral resource estimate for Zone 58N was prepared under the supervision of Réjean Sirois, Eng., Vice President Geology and Resources for G Mining Services Inc., a Qualified Person as defined by Canadian Securities Administrators National Instrument 43-101 “Standards of Disclosure for Mineral Projects”.

The scientific and technical information contained in this news release was reviewed and approved by Réjean Sirois, Eng. and Drew Anwyll, P.Eng., Senior Vice President Technical Services for Detour Gold, a Qualified Person as defined by NI 43-101.

Notes on Estimation Method

• Reported in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) standards for mineral resources and reserves, adopted by CIM Council, as amended.
• All HQ and NQ core assays obtained by analytical methods described in the March 2017 Technical Report under Section 11.3.3. Quality Assurance and quality control procedures included the systematic insertion of blanks, standards, and duplicates into the sample stream.
• Mineral resources reported at a cut-off grade of 2.2 g/t Au, using a gold price of US$1,300 per ounce and a US$/C$ exchange rate of 1.25 with an assumed mining dilution of 12%.
• Mineralized domains were modeled using selections of mineralized intervals based on varying degrees of visual alteration (sulphide, sericite, and quartz veining) due to good correlation with the gold mineralization. Based on the nuggetty nature of the gold mineralization and limited strike length continuity, a grade-based approach to establish domains was not used.
• Mineral resource encompasses 10 domains, each defined by its individual 3D wireframe with a minimum true thickness of 3.0 metres. Domains are subvertical, strike east-west, with the two largest domains plunging 85 degrees to the east.
• High grade gold assays were capped at values ranging from 20 to 120 g/t Au depending on the domain.
• Bulk density value of 2.7 t/m³.
• Interpolation completed using 2 metre composites. The block grade estimate used 1-pass nearest neighbor (NN) and 4-pass Inverse Distance Cubed (ID3) interpolation method.
• Block model uses block sizes of 5 x 3 x 5 metres.
• Mineral resources are not mineral reserves as they do not have demonstrated economic viability.

About Detour Gold

Detour Gold is an intermediate gold producer in Canada that holds a 100% interest in the Detour Lake mine, a long life large-scale open pit operation.