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Osisko Intersects High-Grade at Windfall

Including 106 g/t Au Over 4.0 Metres in Lynx

Triple Lynx Extended 50 Metres Up Plunge to the SW and Vertically to NE

TORONTO, Jan. 09, 2020 (GLOBE NEWSWIRE) -- Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide new drilling results from the ongoing definition and expansion drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

The program is currently focused on infill drilling and expansion drilling at the Lynx deposit, exploration on the main mineralized zones, and deep exploration in the central areas of the mineralized intrusive system.

Osisko President and Chief Executive Officer John Burzynski commented: “We are very pleased with today’s results from Windfall, especially the continuing high-grade extension in Triple Lynx. Drilling continues to deliver positive results and demonstrate the strong continuity of grade inside the known mineralized zones, many of which remain open in at least one direction. The new intersections include the last batch of 2019 infill drilling which will be incorporated into the updated Windfall resource estimate anticipated in February.”

Significant new analytical results from 116 intercepts in 44 surface drill holes and 19 wedges focused on Lynx, Main Zone and Triple 8 infill and expansion drilling are presented below. Additionally, 71 intercepts from 45 underground infill drill holes are included in the table below.

Highlights from new results include:  266 g/t Au over 2.0 metres in OSK-W-1603-W5, 106 g/t Au over 4.0 metres in OSK-19-2139; 135 g/t Au over 2.5 metres in WST-19-0251; 114 g/t Au 2.5 metres in OSK-W-19-1965, 36.9 g/t Au over 5.0 metres in OSK-W-19-1104-W4;  83.8 g/t Au over 2.1 metres in WST-19-222A, 18.5 g/t Au over 9.0 metres in WST-19-0161A; 77.7 g/t Au over 2.1 metres in WST-19-0273A; 76.6 g/t Au over 2.1 metres in WST-19-0188 and 44.7 g/t Au over 3.2 metres in OSK-W-19-2170. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Surface Drilling

Hole No. From (m) To (m) Interval (m) Au (g/t) uncut Au (g/t) cut to 100 g/t Zone Corridor
OSK-W-18-1604 715.3 717.3 2.0 35.1   Lynx_336 Lynx
including 715.3 716.3 1.0 66.9  
OSK-W-18-1731-W1 871.1 874.0 2.9 7.93   Lynx_313 Lynx
including 872.4 873.0 0.6 21.3  
  895.5 897.8 2.3 5.39   Lynx_327 Lynx
OSK-W-19-991-W6 1215.9 1218.0 2.1 3.88   Lynx 4 Lynx
OSK-W-19-1104-W4 826.0 828.0 2.0 4.14   Lynx 4 Lynx
  840.9 846.5 5.6 6.82   Lynx_313 Lynx
including 840.9 841.6 0.7 29.1  
  856.0 861.0 5.0 36.9 16.3 Lynx 4 Lynx
including 858.2 858.6 0.4 357 100
  906.5 908.5 2.0 25.7 16.0 Lynx 4 Lynx
including 907.5 907.8 0.3 165 100
OSK-W-19-1272-W3 799.0 803.0 4.0 7.92   Triple Lynx Triple Lynx
OSK-W-19-1603-W3 1411. 1413.9 2.9 8.94   Triple 8 Triple 8
  1453.5 1455.6 2.1 11.9   Triple 8 Triple 8
including 1453.5 1454.2 0.7 31.8  
  1459.5 1461.5 2.0 4.04   Triple 8 Triple 8
  1477.7 1479.7 2.0 5.62   Triple 8 Triple 8
  1550.8 1553.0 2.2 4.25   Triple 8 Triple 8
including 1552.0 1552.4 0.4 13.2  
  1558.0 1560.2 2.2 4.92   Triple 8 Triple 8
OSK-W-19-1603-W4 1622.3 1624.8 2.5 9.17   Triple 8 Triple 8
OSK-W-19-1603-W5 1542.0 1544.0 2.0 4.96   Triple 8 Triple 8
including 1542.5 1542.8 0.3 15.7  
  1612.0 1614.0 2.0 266 50.1 Triple 8 Triple 8
including 1612.0 1613.0 1.0 531 100
  1633.3 1635.3 2.0 19.0   Triple 8 Triple 8
including 1633.9 1634.7 0.8 44.0  
  1680.8 1683.0 2.2 7.08   Triple 8 Triple 8
including 1681.4 1681.9 0.5 29.6  
  1711.7 1713.9 2.2 9.85   Triple 8 Triple 8
OSK-W-19-1783-W3 1629.8 1632.4 2.6 5.48   Triple 8 Triple 8
  2019.4 2021.8 2.4 6.65   Triple 8 Triple 8
  2185.0 2187.5 2.5 4.49   Triple 8 Triple 8
including 2186.1 2186.5 0.4 25.7  
OSK-W-19-1835-W3 604.7 607.0 2.3 3.06   Underdog Underdog
  746.0 748.0 2.0 3.43   Underdog Underdog
  915.0 917.0 2.0 3.33   Underdog Underdog
  1144.0 1146.0 2.0 4.04   Underdog Underdog
  1186.4 1196.5 10.1 4.85   Underdog Underdog
including 1192.7 1193.4 0.7 17.1  
OSK-W-19-1867 260.9 263.6 2.7 3.26   F51 F51
OSK-W-19-1882 798.0 800.4 2.4 7.60   Underdog Underdog
including 799.7 800.4 0.7 22.1  
OSK-W-19-1933 303.0 305.0 2.0 3.40   Caribou_201 Caribou
  396.0 398.1 2.1 4.53   Caribou_207 Caribou
  508.5 512.0 3.5 3.96   Z27_112 Zone 27
  524.0 526.7 2.7 4.91   Z27_110 Zone 27
OSK-W-19-1942-W2 906.0 908.2 2.2 4.81   Lynx_327 Lynx
including 907.8 908.2 0.4 17.9  
OSK-W-19-1963-W2 1122.0 1124.0 2.0 6.24   Lynx 4 Lynx
OSK-W-19-1963-W6 1402.7 1406.6 3.9 23.8   Lynx 4 Lynx
including 1405.1 1406.6 1.5 44.8  
  1411.8 1414.0 2.2 3.94   Lynx 4 Lynx
OSK-W-19-1965 116.0 118.5 2.5 114 34.8 Windfall Nord Windfall Nord
including 117.3 118.1 0.8 346 100
OSK-W-19-1969 198.0 200.0 2.0 3.06   Lynx corridor Lynx
including 199.0 200.0 1.0 5.64  
OSK-W-19-1973 83.2 85.5 2.3 5.29   Caribou_220 Caribou
including 84.2 84.5 0.3 40.5  
  92.2 95.1 2.9 4.37   Caribou_220 Caribou
including 94.8 95.1 0.3 23.7  
  387.0 389.0 2.0 4.51   Caribou_201 Caribou
  415.2 418.0 2.8 5.91   Z27 corridor Zone 27
OSK-W-19-1988 1583.2 1585.4 2.2 9.52   Triple 8 Triple 8
  1690.8 1693.0 2.2 5.97   Triple 8 Triple 8
  1771.0 1773.2 2.2 6.17   Triple 8 Triple 8
  1779.0 1783.0 4.0 6.02   Triple 8 Triple 8
OSK-W-19-1988-W1 1596.0 1598.0 2.0 9.05   Triple 8 Triple 8
  1794.8 1796.8 2.0 5.66   Triple 8 Triple 8
including 1795.3 1795.7 0.4 24.7  
OSK-W-19-1993 103.1 105.5 2.4 5.14   F11 F11
OSK-W-19-1995 400.1 402.4 2.3 4.16   Caribou_230 Caribou
  501.0 503.5 2.5 12.2   Caribou_207 Caribou
including 501.0 502.0 1.0 30.3  
OSK-W-19-1996 13.0 15.1 2.1 3.67   Bobcat Bobcat
OSK-W-19-1998 100.9 104.0 3.1 12.6   F11 F11
including 103.0 104.0 1.0 30.0  
OSK-W-19-2001 119.5 121.7 2.2 16.8   F11 F11
including 119.5 120.1 0.6 43.6  
  125.4 127.7 2.3 7.81   F11 F11
OSK-W-19-2019 149.0 151.0 2.0 17.5   F11 F11
including 149.0 150.0 1.0 34.8  
OSK-W-19-2020 223.3 225.4 2.1 3.95   Bobcat Bobcat
including 224.9 225.4 0.5 14.4  
OSK-W-19-2021 58.4 60.4 2.0 4.08   F11 F11
including 60.0 60.4 0.4 17.4  
OSK-W-19-2024 99.0 101.0 2.0 12.9   F11 F11
including 100.0 101.0 1.0 24.3  
  108.6 110.6 2.0 4.24   F11 F11
OSK-W-19-2027 21.0 27.0 6.0 4.46   F11 F11
  29.9 32.5 2.6 3.20   F11 F11
OSK-W-19-2031 72.0 74.2 2.2 14.9   Bobcat Bobcat
including 73.4 74.2 0.8 37.7  
OSK-W-19-2055 210.8 213.0 2.2 12.4   F51 F51
including 211.6 211.9 0.3 80.3  
  280.9 283.0 2.1 7.50   F51 F51
OSK-W-19-2061 453.0 455.0 2.0 4.72   Lynx Lynx
OSK-W-19-2066 261.5 263.7 2.2 59.1   F51 F51
including 261.8 263.4 1.6 79.2  
OSK-W-19-2067 1144.0 1146.0 2.0 3.16   Triple Lynx Triple Lynx
OSK-W-19-2067-W4 1049.0 1053.3 4.3 3.70   Triple Lynx Triple Lynx
  1068.5 1072.0 3.5 6.88   Triple Lynx Triple Lynx
  1106.0 1109.0 3.0 12.2   Triple Lynx Triple Lynx
  1115.0 1117.5 2.5 5.46   Triple Lynx Triple Lynx
  1123.0 1126.6 3.6 15.4   Triple Lynx Triple Lynx
including 1124.0 1125.0 1.0 37.4  
  1134.0 1139.0 5.0 5.56   Triple Lynx Triple Lynx
OSK-W-19-2068 516.8 519.0 2.2 4.17   Lynx Lynx
OSK-W-19-2080 153.7 155.7 2.0 8.68   F51 F51
including 153.7 154.2 0.5 20.5  
  199.6 203.2 3.6 28.2   F51 F51
including 199.6 200.0 0.4 43.9  
and 202.2 203.2 1.0 70.7  
  211.0 213.3 2.3 5.09   F51 F51
OSK-W-19-2081 38.1 40.4 2.3 44.7 39.4 Bobcat Bobcat
including 38.1 39.0 0.9 114 100
OSK-W-19-2082 151.0 154.0 3.0 5.11   Bobcat Bobcat
OSK-W-19-2083 115.0 117.0 2.0 3.67   Caribou Caribou
including 115.5 116.5 1.0 6.93  
OSK-W-19-2086 280.0 282.0 2.0 6.76   F51 F51
including 281.0 281.5 0.5 18.7  
OSK-W-19-2087 215.4 217.4 2.0 4.59   F51 F51
OSK-W-19-2100-W4 967.5 970.0 2.5 9.80   Triple Lynx Triple Lynx
including 969.7 970.0 0.3 56.6  
OSK-W-19-2101 721.0 724.7 3.7 9.33   Triple Lynx Triple Lynx
including 724.3 724.7 0.4 32.0  
OSK-W-19-2104 99.5 102.2 2.7 3.13   F11 F11
OSK-W-19-2107-W2 578.5 580.6 2.1 12.2   Lynx_331 Lynx
including 579.8 580.2 0.4 28.7  
  890.0 892.0 2.0 3.82   Triple Lynx Triple Lynx
OSK-W-19-2108-W2 1346.2 1348.5 2.3 6.50   Triple Lynx Triple Lynx
OSK-W-19-2120-W3 1052.4 1054.8 2.4 3.33   Lynx 4 Lynx
OSK-W-19-2139 892.4 899.8 7.4 6.93   Triple Lynx Triple Lynx
including 896.0 897.0 1.0 22.9  
  956.6 960.6 4.0 106 46.5 Triple Lynx Triple Lynx
including 959.8 960.3 0.5 566 100
  964.0 966.0 2.0 3.19   Triple Lynx Triple Lynx
OSK-W-19-2139-W2 876.7 879.0 2.3 22.9   Triple Lynx Triple Lynx
including 876.7 877.2 0.5 84.7  
  927.4 929.5 2.1 4.99   Triple Lynx Triple Lynx
including 927.4 928.1 0.7 12.5  
  1077.0 1079.0 2.0 3.03   Triple Lynx Triple Lynx
  1083.0 1085.3 2.3 5.66   Triple Lynx Triple Lynx
OSK-W-19-2160 743.0 745.0 2.0 3.37   Lynx Lynx
OSK-W-19-2170 960.3 963.0 2.7 35.5   Triple Lynx Triple Lynx
including 960.9 961.8 0.9 70.6  
  1016.7 1018.8 2.1 3.96   Triple Lynx Triple Lynx
  1022.8 1026.0 3.2 44.7 16.4 Triple Lynx Triple Lynx
including 1022.8 1023.1 0.3 402 100
OSK-W-19-2178 367.0 369.3 2.3 13.4   Lynx_301 Lynx
including 367.5 368.3 0.8 37.5  
OSK-W-19-2181 117.0 119.1 2.1 4.11   Lynx_305 Lynx
including 117.0 117.3 0.3 20.0  
  150.6 153.2 2.6 10.2   Lynx_307 Lynx
OSK-W-19-2183 441.0 443.1 2.1 8.41   Lynx_301 Lynx
including 441.0 441.5 0.5 17.9  
OSK-W-19-2184 97.0 99.4 2.4 18.0   Lynx_308 Lynx
including 98.5 98.9 0.4 89.9  
OSK-W-19-2186 62.0 64.1 2.1 14.4   Lynx Lynx
including 62.0 62.3 0.3 87.0  
  83.0 85.0 2.0 6.42   Lynx_308 Lynx
including 84.2 84.5 0.3 41.3  
OSK-W-19-2188 53.8 55.9 2.1 5.01   Lynx_306 Lynx
including 53.8 54.1 0.3 33.2  
  93.0 95.0 2.0 7.50   Lynx_308 Lynx
OSK-W-19-2191 52.7 55.1 2.4 5.68   Lynx_310 Lynx
including 54.0 54.3 0.3 37.3  
OSK-W-19-2193 60.0 62.2 2.2 4.29   Lynx_308 Lynx
including 61.6 61.9 0.3 19.7  
OSK-W-19-2195 336.9 339.0 2.1 18.8   Lynx_301 Lynx
including 336.9 338.0 1.1 32.2  

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See "Quality Control and Reporting Protocols" below.

Underground Drilling

...
Hole No. From (m) To (m) Interval (m) Au (g/t) uncut Au (g/t) cut to 100 g/t Zone Corridor
WST-19-0029 44.0 46.0 2.0 3.65   Z27_103 Zone 27
WST-19-0030 55.0 57.0 2.0 3.33   Z27_103 Zone 27
  81.0 83.0 2.0 7.91   Z27_104 Zone 27
WST-19-0033 64.0 66.5 2.5 6.24   Z27_103 Zone 27
including 65.1 65.9 0.8 19.0  
WST-19-0076 115.3 117.6 2.3 3.22   Z27 corridor Zone 27
WST-19-0160A 83.9 87.5 3.6 8.04   Z27_113 Zone 27
WST-19-0161A 61.0 65.0 4.0 8.71   Z27_113 Zone 27
including 61.0 62.0 1.0 19.8  
  101.0 110.0 9.0 18.5   Z27_115 Zone 27
including 105.0 107.0 2.0 62.3  
WST-19-0162 66.9 70.9 4.0 5.85   Z27 corridor Zone 27
including 68.7 69.2 0.5 18.4  
WST-19-0183 37.0 39.0 2.0 3.92   Z27_103 Zone 27
including 37.8 38.2 0.4 19.1  
WST-19-0184 79.1 81.1 2.0 4.41   Z27_104 Zone 27
including 80.0 80.8 0.8 10.5  
WST-19-0186 35.0 37.0 2.0 4.17   Z27_103 Zone 27
including 36.3 36.6 0.3 27.2  
WST-19-0187 108.4 110.5 2.1 6.02   Z27_115 Zone 27
including 109.7 110.0 0.3 40.4  
WST-19-0188 62.0 67.0 5.0 3.46   Caribou Caribou
including 63.5 64.1 0.6 12.4  
  98.0 100.0 2.0 4.93   Z27_101 Zone 27
  106.9 109.0 2.1 76.6 39.1 Z27_115 Zone 27
including 106.9 107.7 0.8 199 100
WST-19-0189 103.0 105.0 2.0 8.22   Z27_101 Zone 27
including 103.7 104.6 0.9 16.6  
  107.9 110.0 2.1 3.08   Z27_115 Zone 27
WST-19-0190 110.4 113.8 3.4 3.42   Z27_115 Zone 27
WST-19-0191 85.4 87.6 2.2 9.13   Z27_101 Zone 27
including 87.0 87.6 0.6 30.9  
WST-19-0192 71.0 73.3 2.3 3.31   Caribou_201 Caribou
including 73.0 73.3 0.3 12.0  
  96.2 99.0 2.8 9.05   Z27_115 Zone 27
  103.2 105.5 2.3 7.08   Z27_115 Zone 27
including 104.6 105.5 0.9 16.6  
WST-19-0193 56.0 58.0 2.0 3.34   Caribou_203 Caribou
  127.4 129.9 2.5 9.26   Z27_115 Zone 27
WST-19-0194 136.5 138.6 2.1 6.42   Z27_115 Zone 27
including 137.0 137.8 0.8 14.2  
WST-19-0210 130.0 132.0 2.0 7.30   Lynx Lynx
including 130.0 131.0 1.0 14.5  
WST-19-0214 214.4 216.7 2.3 6.72   Caribou_201 Caribou
WST-19-0219 274.0 276.0 2.0 3.98   Caribou corridor Caribou
WST-19-0220 74.9 77.0 2.1 8.46   Z27_116 Zone 27
including 74.9 75.3 0.4 40.4  
  135.0 137.1 2.1 4.01   Caribou_201 Caribou
including 136.6 137.1 0.5 16.3  
  235.0 237.0 2.0 5.24   Caribou_238 Caribou
including 235.5 235.9 0.4 22.0  
WST-19-0221 119.0 121.0 2.0 14.5   Caribou_207 Caribou
including 119.8 120.1 0.3 96.3  
WST-19-0222A 228.0 230.0 2.0 4.52   Caribou_206 Caribou
  236.0 238.0 2.0 6.66   Caribou_206 Caribou
including 236.0 237.0 1.0 13.1  
  292.0 294.4 2.4 3.07   Caribou_217 Caribou
  302.5 304.6 2.1 83.8 19.3 Caribou_217 Caribou
including 304.2 304.6 0.4 439 100
WST-19-0223