Mineral resource estimates for gold deposits in the Urban-Barry camp

Press Release

Val-d’Or, QC – May 28, 2019: Bonterra Resources Inc. (TSX-V: BTR, OTCQX: BONXF, FSE: 9BR1)(“Bonterra” or the “Company”) is pleased to announce results of the recently completed NI 43-101 Mineral Resource Estimates for the Gladiator, Barry, and Moroy deposits located in the Urban-Barry Camp, QC.  Highlights of the Mineral Resource Estimates for Gladiator include:

• Indicated Resources of 743,000 tonnes at an average grade of 8.46 grams per tonne Au totaling 202,000 ounces Au.
• Inferred resources of 3,065,000 tonnes at an average grade of 9.10 grams per tonne Au totaling 897,000 ounces Au.

The results of the Mineral Resource Estimates for the Gladiator, Barry, and Moroy deposits are summarized in table 1.  The Mineral Resource Estimates for the Gladiator and Barry deposits are reported at a 3.5 gram per tonne Au cut-off grade.  The Mineral Resource Estimate for the Moroy deposit is reported at a 3.0 gram per tonne cut-off grade.  The resource models are tabulated at various cut-off grades in tables 2 – 4 below.  The Mineral Resource Estimates have been prepared by SGS Geological Services, Blainville, QC, and has been reviewed internally by the Corporation. The full technical report, which is being prepared in accordance with National Instrument 43-101 (“NI-43-101”), will be available on SEDAR (www.sedar.com) under the Corporation’s issuer profile within 45 days. The effective date of the current mineral resource estimate is May 24, 2019.

Table 1.  Mineral Resource Estimate (effective May 24, 2019)

1. The classification of the current Mineral Resource Estimates into Measured, Indicated and Inferred are consistent with current 2014 CIM Definition Standards – For Mineral Resources and Mineral Reserves
2. Mineral resources which are not mineral reserves do not have demonstrated economic viability. An Inferred Mineral Resource has a lower level of confidence than that applying to a Measured and Indicated Mineral Resource and must not be converted to a Mineral Reserve. It is reasonably expected that the majority of Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration.
3. All figures are rounded to reflect the relative accuracy of the estimate. Composites have been capped where appropriate.
4. Resources are presented undiluted and in situ and are considered to have reasonable prospects for economic extraction. In order to meet this requirement, the Gladiator, Barry and Moroy Deposit mineralization are considered amenable for underground extraction.
5. Underground mineral resources are reported at a cut-off grade of 3.5 g/t Au for Gladiator and Barry, and 3.0 for Moroy. Cut-off grades are based on a gold price of US$1,300 per ounce, a foreign exchange rate of US$0.75, gold recoveries of 93% – 95%, and reasonable mining, processing and transportation costs.
6. High grade capping was done on composite data. Capping values of 30 to 55 g/t Au were applied to all 3D grade controlled wireframe models.  A fixed specific gravity value of 2.82 was used to estimate the tonnage from block model volumes for Moroy and Barry, and 2.78 for Gladiator.
7. Mineral Resources for Barry and Moroy are exclusive of material that has been mined.

Greg Gibson, Executive Chairman and Interim CEO of Bonterra commented: “We are pleased with the current mineral resource estimates on our three Urban-Barry gold deposits. The mineral resources delineated to date are a mere snapshot in time with further indications of continued expansion potential along strike and at depth for the three deposits.”

About the Gladiator, Barry, and Moroy Deposits

The Gladiator, Barry, and Moroy deposits are located in the Urban-Barry greenstone belt, approximately 200 km northeast of Val d’Or, QC.  The Moroy deposit is located on the Bachelor property which includes the Bachelor deposit and the Urban-Barry mill.  The Gladiator and Barry deposits are located on the Urban-Barry property, approximately 125 and 110 kilometres respectively, from the Urban-Barry mill (see Figure 1).

The Moroy deposit is a shear hosted gold deposit comprised of multiple, sub-parallel, gold bearing zones dipping moderately to steeply to the North. Moroy mineralization consists of disseminated sulfides within silica-hematite alteration located at the contacts of syenitic dykes.  The Moroy deposit is located approximately 600 metres south of the Bachelor deposit and has been accessed underground from the Bachelor mine.  The Moroy deposit has been delineated over strike length of approximately 400 metres and remains open for expansion.

The Barry deposit is a shear-hosted gold deposit with multiple parallel, sub-vertical, shear zones and a second set of veins dipping 50 to 60 degrees to the south. The gold mineralization consists of disseminated sulfides within the shear zones and the veins with local visible gold. The Barry deposit has been delineated over 1 kilometres along strike and 600 metres vertical.  The deposit remains open for expansion.

The Gladiator deposit occurs within a major shear corridor and is a quartz vein hosted gold deposit consisting of several steeply south dipping vein and shear structures.  Mineralization at Gladiator consists dominantly of free gold in quartz veins.  Gladiator is currently defined over a 1.5 kilometres strike length and to a vertical depth of 800 metres.  The Gladiator deposit remains open at depth and along strike.

The Company currently has five drills operating on the Bachelor and Urban-Barry properties.   These drills are testing a combination of resource expansion and earlier stage exploration targets.

Table 2.  Gladiator Mineral Resource Estimate tabulated at various cut off grades

Values in this table are reported to illustrate the sensitivity of the block model to cut-off grade relative to the base case resource estimate.  The Gladiator Resource Estimate is based on a cut-off grade of 3.5 g/t Au (see table 1) and values presented here above and below the base case should not be interpreted as a mineral resource statement.

Table 3. Barry Mineral Resource Estimate tabulated at various cut off gradesV

Values in this table are reported to illustrate the sensitivity of the block model to cut-off grade relative to the base case resource estimate.  The Barry Resource Estimate is based on a cut-off grade of 3.5 g/t Au (see table 1) and values presented here above and below the base case should not be interpreted as a mineral resource statement.  Mineral Resources are exclusive of material that has been mined.

Table 4. Moroy Mineral Resource Estimate tabulated at various cut off grades

Values in this table are reported to illustrate the sensitivity of the block model to cut-off grade relative to the base case resource estimate.  The Moroy Resource Estimate is based on a cut-off grade of 3.0 g/t Au (see table 1) and values presented here above and below the base case should not be interpreted as a mineral resource statement.  Mineral Resources are exclusive of material that has been mined.

Qualified Persons

Pascal Hamelin, ing., P.Eng., VP Operations for Bonterra is a Qualified Person under NI 43-101 and has reviewed and approved the contents of this release.

The Mineral Resource Estimates presented in this news release were estimated by Allan Armitage, Ph.D., P. Geo. (“Armitage”), and Olivier Vadnais-Leblanc, B.Sc., géo. (“Vadnais-Leblanc”), both of SGS Geological Services. Armitage and Vadnais-Leblanc are independent Qualified Persons as defined by NI 43-101.

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