Mr. John Burzynski reports
OSISKO INTERSECTS 86.7 G/T AU OVER 4.3 METRES AT WINDFALL
Osisko Mining Inc. hasprovided new results from the continuing drill program at its 100-per-cent-owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban township, Eeyou Istchee, James Bay, Quebec. The 800,000-metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately northeast of Windfall).
Significant new analytical results from 148 intercepts in 84 drill holes and five wedges focused on infill and expansion drilling in the Main Windfall Lake deposit are presented below.
New Underdog zone discovered to southwest; New mineralization discovered between the Mallard zone and zone 27; New mineralization discovered near surface west of the main deposit.
Highlights from the new results include: 86.7 grams per tonne gold over 4.3 metres in OSK-W-17-1345; 74.0 g/t Au over 2.5 metres and 29.6 g/t Au over 2.9 metres in OSK-W-17-1334; 48.6 g/t over 2.0 metres in OSK-OBM-15-565; 32.7 g/t Au over 2.8 metres in OSK-W-17-1233; 41.5 g/t Au over 2.0 metres and 24.8 g/t Au over 2.4 metres in OSK-OBM-16-678; 10.0 g/t Au over 8.1 metres in OSK-W-17-1317; 11.1 g/t Au over 6.9 metres in OSK-W-17-1125-W1; 29.2 g/t Au over 2.2 metres in OSK-W-17-1273; 11.6 g/t Au over 5.4 metres in OSK-W-17-1308; 25.2 g/t Au over 2.0 metres in OSK-W-17-1313; and 20.5 g/t Au over 2.3 metres in OSK-W-17-1225.
Hole FromToIntervalAu uncutAu cut to 100 g/tNo. (m) (m) (m) (g/t)(g/t)OSK-OBM-15-565393.0 395.0 2.048.6including 394.0 395.0 1.096.9OSK-OBM-16-678256.0 258.4 2.424.8including 257.5 258.4 0.965.4318.0 320.0 2.041.5including 319.0 320.0 1.082.8OSK-W-17-937-W1 786.4 788.6 2.23.21OSK-W-17-937-W2 749.0 751.5 2.516.8811.0 813.0 2.09.01including 811.3 811.8 0.525.2OSK-W-17-978492.2 495.0 2.83.04OSK-W-17-989-W2 506.0 509.0 3.06.29including 506.0 507.0 1.016.0OSK-W-17-1002 284.0 286.0 2.05.07including 284.6 285.0 0.416.5OSK-W-17-1014 176.6 180.0 3.46.27including 178.4 179.0 0.630.0OSK-W-17-105151.053.4 2.43.94OSK-W-17-1052 721.0 723.3 2.33.81including 721.8 722.1 0.321.9OSK-W-17-105374.779.8 5.15.06including79.279.8 0.638.2OSK-W-17-107397.2 101.4 4.23.11OSK-W-17-107759.061.0 2.08.41including59.460.0 0.618.0OSK-W-17-1125-W1368.0 370.1 2.14.01445.0 447.0 2.07.57including 445.0 446.0 1.015.1475.0 481.9 6.911.1including 479.0 481.0 2.026.5OSK-W-17-1125-W3420.0 422.0 2.018.1including 421.0 422.0 1.036.1501.0 503.0 2.010.2including 502.0 503.0 1.019.6OSK-W-17-1134 366.8369.10 2.316.0including 366.8 367.5 0.750.6OSK-W-17-1135 115.0 117.4 2.43.33OSK-W-17-113977.079.0 2.04.06OSK-W-17-1140 326.0 328.4 2.43.94including 328.1 328.4 0.329.7OSK-W-17-114187.091.1 4.14.00OSK-W-17-114564.367.5 3.24.01including66.567.5 1.010.2OSK-W-17-1159 538.0 540.0 2.04.99OSK-W-17-1163 356.0 358.0 2.09.60including 356.0 357.0 1.019.1OSK-W-17-1164 120.7 123.0 2.33.37OSK-W-17-118450.052.0 2.04.21including50.551.0 0.516.8164.9 167.5 2.64.64including 166.6 167.5 0.913.0OSK-W-17-1186 407.5 410.5 3.012.3including 407.5 409.0 1.524.4502.0 504.5 2.53.49including 502.0 503.0 1.08.61OSK-W-17-118899.2 101.8 2.616.8including 100.2 100.8 0.667.9OSK-W-17-1191 194.2 197.0 2.813.9including 194.2 194.8 0.663.4200.5 202.6 2.17.46including 201.5 202.6 1.113.9OSK-W-17-1194 325.5 331.4 5.93.12including 325.5 326.1 0.623.8OSK-W-17-1196 185.0 187.0 2.015.7including 186.6 187.0 0.472.5OSK-W-17-1198 186.9 194.4 7.53.47including 186.9 188.1 1.212.6OSK-W-17-1200 245.1 248.0 2.93.00including 247.1 248.0 0.98.74OSK-W-17-1202 554.8 557.0 2.28.71including 554.8 555.6 0.823.2OSK-W-17-1203 269.0 272.0 3.06.76including 270.2 270.7 0.531.7OSK-W-17-1207 8.010.3 2.35.94including 8.0 8.8 0.814.3182.6 184.9 2.33.35OSK-W-17-1215 105.0 107.0 2.04.11OSK-W-17-121714.917.1 2.25.47including15.616.4 0.814.4OSK-W-17-1225 9.012.3 3.35.77201.3 203.6 2.39.58including 201.3 202.0 0.730.3245.2 247.5 2.320.5including 245.2 246.4 1.239.1OSK-W-17-1227 926.0 929.4 3.46.56including 926.0 927.0 1.015.8962.0 964.0 2.010.5969.0 971.0 2.04.93OSK-W-17-123339.942.7 2.832.7including40.541.6 1.181.3OSK-W-17-1239 226.0 228.0 2.04.11255.2 258.0 2.810.4OSK-W-17-1247 326.0 329.0 3.03.00OSK-W-17-1256 315.0 317.2 2.23.11OSK-W-17-126471.174.5 3.46.33including71.471.9 0.541.4166.5 169.0 2.56.88including 167.4 167.7 0.354.0OSK-W-17-1265 738.7 741.0 2.35.34940.8 942.8 2.013.0including 941.2 942.2 1.025.7OSK-W-17-1267 101.6 104.0 2.43.04OSK-W-17-126883.085.0 2.05.51161.0 163.0 2.09.39183.0 186.0 3.08.17including 183.0 183.9 0.923.8266.3 268.4 2.14.84including 266.3 266.8 0.515.0OSK-W-17-126969.572.0 2.53.10117.5 122.0 4.53.69including 117.5 118.0 0.58.01134.5 137.5 3.03.09146.0 148.4 2.43.47175.3 178.0 2.73.33including 176.0 177.0 1.07.47OSK-W-17-1270 918.2 926.0 7.83.07950.1 953.0 2.97.14OSK-W-17-1273 155.9 158.0 2.16.72including 157.1 158.0 0.914.1164.5 167.0 2.516.4including 165.7 166.2 0.580.9171.0 173.2 2.229.2OSK-W-17-1275 295.7 298.3 2.612.4including 297.8 298.3 0.553.2OSK-W-17-1276 176.0 178.8 2.812.6including 177.9 178.8 0.938.6195.6 197.6 2.013.3including 196.0 196.3 0.386.9OSK-W-17-1279 146.7 148.9 2.24.56OSK-W-17-1281 264.0 266.2 2.23.24including 264.9 265.4 0.513.3425.0 428.0 3.03.25447.9 451.9 4.03.37OSK-W-17-128295.898.9 3.18.06OSK-W-17-1288 613.3 615.9 2.63.44OSK-W-17-128939.642.2 2.65.76including41.341.8 0.523.4314.1 316.7 2.65.05including 315.7 316.4 0.713.8368.3 370.8 2.53.22OSK-W-17-1291 282.0 284.0 2.03.65305.0 307.0 2.011.4including 306.0 307.0 1.022.6OSK-W-17-1292 682.9 686.0 3.17.91including 682.9 683.2 0.321.5OSK-W-17-1293 584.7 590.0 5.33.10601.5 608.0 6.53.58645.5 648.0 2.53.63including 646.4 647.0 0.610.2OSK-W-17-1296 125.6 128.0 2.45.82including 125.6 126.0 0.423.5OSK-W-17-1303 211.0 213.3 2.33.74OSK-W-17-1305 376.0 378.5 2.57.65including 378.1 378.5 0.440.9OSK-W-17-1306 987.0 989.6 2.614.7including 988.2 988.9 0.754.2OSK-W-17-1308 884.0 889.4 5.411.6including 888.6 888.9 0.366.7OSK-W-17-131243.046.5 3.57.56OSK-W-17-131390.993.0 2.13.34122.0 125.0 3.05.29211.0 213.0 2.011.3456.0 458.0 2.025.2 15.0including 456.5 456.8 0.3 168100OSK-W-17-1317 182.9 191.0 8.110.0including 186.9 188.0 1.154.3OSK-W-17-1319 215.3 217.3 2.07.42including 217.0 217.3 0.322.8OSK-W-17-1320 463.0 465.0 2.011.9including 463.0 464.0 1.023.8472.1 477.3 5.25.16including 472.1 473.4 1.314.1801.0 803.0 2.06.04including 802.0 803.0 1.011.8OSK-W-17-1323 433.0 435.2 2.25.48OSK-W-17-1326 159.0 161.0 2.08.32including 160.0 161.0 1.016.0180.0 183.3 3.36.13including 183.0 183.3 0.345.1OSK-W-17-133225.027.0 2.08.27including26.227.0 0.818.8OSK-W-17-1333 503.0 506.5 3.518.4including 504.0 505.0 1.053.8593.6 596.0 2.44.85including 593.6 594.3 0.713.8628.0 630.4 2.45.89including 628.0 628.8 0.815.3OSK-W-17-1334 338.2 340.7 2.53.31including 338.2 338.7 0.516.4459.0 461.5 2.574.0 12.2including 460.5 460.8 0.3 615100489.0 491.2 2.212.8including 490.0 490.7 0.733.9498.5 502.0 3.53.73557.2 560.1 2.929.6including 558.1 559.1 1.083.6OSK-W-17-1335 179.0 181.1 2.15.66including 179.8 180.3 0.520.7OSK-W-17-1337 236.3 238.4 2.13.58OSK-W-17-134184.086.0 2.03.43169.0 171.3 2.317.0including 169.6 170.2 0.663.1253.4 256.3 2.97.79272.8 277.9 5.14.52316.6 318.9 2.35.23OSK-W-17-1342 261.8 263.8 2.03.30OSK-W-17-1344 446.0 448.4 2.49.54including 447.8 448.4 0.637.5OSK-W-17-1345 540.8 543.3 2.57.40684.0 688.3 4.386.7 13.9including 687.9 688.3 0.4 883100OSK-W-17-1348 423.0 425.0 2.04.25including 423.4 423.9 0.511.6OSK-W-17-1350 538.9 540.9 2.09.37including 539.6 540.3 0.722.7697.0 699.0 2.04.45776.0 778.0 2.06.33826.3 829.7 3.46.88including 828.7 829.0 0.339.0OSK-W-17-1351 454.0 456.2 2.26.14725.8 728.0 2.23.65735.4 737.7 2.33.64OSK-W-17-1359 467.4 470.0 2.65.06including 467.4 468.5 1.110.8499.0 501.3 2.35.37including 499.0 499.5 0.516.8604.6 606.7 2.13.87754.8 757.0 2.24.98OSK-W-17-1368 411.0 413.0 2.08.71OSK-W-17-1369 346.0 348.0 2.014.8OSK-W-17-1371 363.0 365.6 2.65.63including 363.0 363.8 0.815.7OSK-W-17-1381 299.3 302.5 3.27.60NotesTrue widths are estimated at 65 to 80 per cent of the reported core length interval.
OSK-OBM-15-565 intersected 48.6 g/t Au over 2.0 metres. This interval is located between Mallard and zone 27 corridors. Mineralization is composed of 1 per cent pyrite stringers and trace disseminated pyrite in a sericitized andesite.
OSK-OBM-16-678 intersected 24.8 g/t Au over 2.4 metres and 41.5 g/t Au over 2.0 metres in zone 27. The first interval is composed of a 30-centimetre massive pyrite vein hosted in a sericitized rhyolite. The second interval is composed of up to 4 per cent pyrite stringers at the contact between a bleached andesite and a sericitized porphyritic felsic dike.
OSK-W-17-937-W1 intersected 3.21 g/t Au over 2.2 metres. The interval is in Wolf 2 and is composed of up to 8 per cent pyrite stringers and disseminated pyrite in andesite and porphyritic felsic units.
OSK-W-17-937-W2 intersected 16.8 g/t Au over 2.5 metres and 9.01 g/t Au over 2.0 metres in the Caribou corridor. The first interval is in the Wolf HW and composed of 1 per cent pyrite stringers and disseminated pyrite in a chloritized and slightly sericitized andesite. The second interval is in Wolf 2 hosted in andesite and silicified felsic intrusions with 5 per cent pyrite in pervasive silica flooding and 7 per cent pyrite stringers.
OSK-W-17-978 intersected 3.04 g/t Au over 2.8 metres in Caribou extension. Mineralization is at the contact between a carbonate- and chlorite-altered andesite with 1 per cent pyrite stringers, 10 per cent quartz-tourmaline veins, and a porphyritic felsic dike with carbonate and hematite alteration with disseminated pyrite and local pervasive silica flooding.
OSK-W-17-989-W2 intersected 6.29 g/t Au over 3.0 metres in CS1 in the Caribou corridor. Mineralization is within a sericitized andesite and composed of 5 per cent pyrite stringers and 2 per cent disseminated pyrite.
OSK-W-17-1002 intersected zone 27 returning 5.07 g/t Au over 2.0 metres. Mineralization is hosted in a sericitized porphyritic felsic dike and composed of 25 per cent pyrite-tourmaline stringers.
OSK-W-17-1014 intersected zone 27 returning 6.27 g/t Au over 3.4 metres. Mineralization is composed of 9 per cent pyrite-tourmaline stringers hosted in a sericitized rhyolite.
OSK-W-17-1051 intersected 3.94 g/t Au over 2.4 metres in a crustiform vein within the F-17 area. Mineralization is composed of a 30-centimetre-scale crustiform vein with traces of pyrite stringers in a strongly silicified porphyritic felsic dike.
OSK-W-17-1052 intersected 3.81 g/t Au over 2.3 metres related to zone 27. Mineralization is composed of 10 per cent pyrite stringers and 1 per cent disseminated pyrite in a strongly sericitized and weakly chloritized gabbro.
OSK-W-17-1053 intersected 5.06 g/t Au over 5.1 metres in zone 27. Mineralization is composed of trace of pyrite stringers and quartz-tourmaline veinlets at a sericitized contact between a felsic porphyritic dike and a rhyolite.
OSK-W-17-1073 intersected 3.11 g/t Au over 4.2 metres in a crustiform vein. Mineralization is composed of up 5 per cent pyrite-tourmaline stringers with a 1.3-metre crustiform vein with pyrite hosted in a porphyritic felsic dike with local sericite alteration.
OSK-W-17-1125-W1 intersected 4.01 g/t Au over 2.1 metres, 7.57 g/t Au over 2.0 metres and 11.1 g/t Au over 6.9 metres within the Caribou corridor. The first interval, in CS3, is composed of sericitized rhyolite containing up to 25 per cent pyrite stringers. The second interval, in Caribou FW, is composed of chloritized zone in a felsic porphyritic dike with trace disseminated pyrite close to the contact with the andesite. The third interval, in Wolf HW, is composed of 2 per cent pyrite stringers and pyrite-tourmaline stringers with local visible gold, chalcopyrite and sphalerit -hosted in a sericitized porphyritic felsic dike.
OSK-W-17-1125-W3 intersected 18.1 g/t Au over 2.0 metres and 10.2 g/t Au over 2.0 metres in Caribou and Wolf, respectively. The first interval is in an altered gabbro with chlorite and carbonates containing traces of disseminated pyrite. The second interval is a sericitized felsic dike with 5 per cent pyrite clusters and 5 per cent chalcopyrite in quartz clusters.
OSK-W-17-1134 intersected 16.0 g/t Au over 2.3 metres in a crustiform vein within the Mallard corridor. Mineralization is composed of 2 per cent pyrite in crustiform veins representing 20 per cent of the interval land 2 per cent pyrite stringers hosted in a sericitized andesite.
OSK-W-17-1135 intersected 3.33 g/t Au over 2.4 metres in zone 27. Mineralization is composed of 1 per cent pyrite clusters with intense silica flooding in a sericitized rhyolite.
OSK-W-17-1139 intersected 4.06 g/t Au over 2.0 metres in the Caribou corridor. Mineralization is hosted in a shear zone with moderate sericite and chlorite alteration, weak silicification, and traces of disseminated pyrite.
OSK-W-17-1140 intersected 3.94 g/t Au over 2.4 metres in the Caribou corridor. Mineralization is within a chloritized andesite with weak silica and sericite alteration and is composed of traces of disseminated pyrite.
OSK-W-17-1141 intersected zone 27 returning 4.00 g/t Au over 4.1 metres. Mineralization is composed of traces of pyrite stringers in a chloritized and sericitized rhyolite.
OSK-W-17-1145 intersected 4.01 g/t Au over 3.2 metres in zone 27 FW. Mineralization is composed of 5 per cent pyrite stringers and 2 per cent pyrite clusters in a sericitized and strongly silicified rhyolite.
OSK-W-17-1159 intersected 4.99 g/t Au over 2.0 metres in Caribou extension. Mineralization is composed of traces of pyrite-tourmaline stringers with 5 per cent quartz-tourmaline veins and ptygmatic tourmaline veins hosted in a foliated, chloritized and sericitized felsic dike.
OSK-W-17-1163 intersected 9.60 g/t Au over 2.0 metres in a new area 200 metres northeast of Mallard. Mineralization is within a chlorite- and carbonate-altered andesite and composed of 2 per cent disseminated pyrite.
OSK-W-17-1164 intersected 3.37 g/t Au over 2.3 metres in zone 27. Mineralization is composed 5 per cent pyrite, in stringers and clusters, at a silicified and sericitized contact between two porphyritic felsic dikes.
OSK-W-17-1184 intersected 4.21 g/t Au over 2.0 metres and 4.64 g/t Au over 2.6 metres in the zone 27 corridor. The first interval is in Z27 HW and composed of 50 per cent semi-massive pyrite over 50 centimetres, 1 per cent pyrite with ptygmatic tourmaline veins within a sericitized felsic porphyritic dike. The second interval is in zone 27 and composed of a chloritized rhyolite with traces of disseminated pyrite.
OSK-W-17-1186 intersected 12.3 g/t Au over 3.0 metres in the Caribou corridor and 3.49 g/t Au over 2.5 metres in zone 27 HW. Both intervals are composed of traces of disseminated and fragmental pyrite in a strongly chloritized andesite.
OSK-W-17-1188 infilled zone 27 with 16.8 g/t Au over 2.6 metres. Mineralization is composed of 2 per cent disseminated pyrite within a chloritized mafic volcanic unit.
OSK-W-17-1191 intersected 13.9 g/t Au over 2.8 metres and 7.46 g/t Au over 2.1 metres in zone 27. The first interval is composed of a sericitized rhyolite with traces of pyrite, disseminated or stringers. The second interval is composed of 1 per cent pyrite stringers within a sericitized felsic porphyritic unit.
OSK-W-17-1194 intersected 3.12 over 5.9 metres in a new zone north of the Mallard corridor. The mineralization is composed of 4 per cent pyrite, stringers and clusters, in a bleached andesite moderately sericitized.
OSK-W-17-1196 intersected 15.7 g/t Au over 2.0 metres in zone 27 FW. Mineralization is composed of 3 per cent pyrite-tourmaline stringers and 1 per cent pyrite in tourmaline ptygmatic veins within a sericitized andesite.
OSK-W-17-1198 infilled zone 27 with 3.47 g/t Au over 7.5 metres. Mineralization is composed of 6 per cent pyrite stringers associated with ptygmatic tourmaline veinlets hosted in a sericitized felsic porphyritic dike.
OSK-W-17-1200 intersected 3.00 g/t Au over 2.9 metres in a new zone in the Caribou corridor. The mineralization is composed of 2 per cent pyrite clusters within a moderately chloritized and weakly sericitized contact between an andesite and a porphyritic felsic dike.
OSK-W-17-1202 intersected 8.71 g/t Au over 2.2 metres in Caribou extension. Mineralization is composed of 15 per cent pyrite stringers within a strongly silicified and weakly fuchsitized felsic dike.
OSK-W-17-1203 intersected Mallard returning 6.76 g/t Au over 3.0 metres. Mineralization is composed of 10 per cent disseminated, stringer and fragmented pyrite, locally semi-massive, hosted in a weakly sericitized and silicified felsic porphyritic dike.
OSK-W-17-1207 intersected 5.94 g/t Au over 2.3 metres and 3.35 g/t Au over 2.3 metres in Mallard corridor. The first interval, in Drake, is composed of a hydrothermal breccia with weak to moderate sericite and silica alteration containing 20 per cent pyrite hosted in a rhyolite. The second interval, in Mallard, is composed of 5 per cent pyrite stringers and traces of disseminated pyrite within a chloritized and weakly sericitized andesite.
OSK-W-17-1215 intersected 4.11 g/t Au over 2.0 metres. Mineralization is composed of a stockwork of semi-massive to massive pyrite (10 to 80 per cent) and chalcopyrite (1 to 5 per cent). Sulphides are within a hydrothermal breccia with polymithic fragments (different felsic porphyritic dike types, fuchsite-altered gabbro and sericitized rhyolite). This is a new potential zone within the Underdog corridor, 700 metres southwest of the main deposit.
OSK-W-17-1217 intersected a new zone between the Mallard and the zone 27 corridor returning 5.47 g/t Au over 2.2 metres. Mineralization is composed of 1 per cent pyrite stringers and disseminated pyrite within a weakly sericitized rhyolite.
OSK-W-17-1225 intersected 5.77 g/t Au over 3.3 metres, 9.58 g/t Au over 2.3 metres and 20.5 g/t Au over 2.3 metres. The first interval is within a chloritized gabbro and composed of 3 per cent pyrite stringers and 1 per cent disseminated pyrite. It is a new zone and geometry is not yet determined. The second interval is in Mallard HW and composed of 4 per cent pyrite clusters, 3 per cent pyrite stringers within a chloritized and sericitized andesite. The third interval is in Mallard and composed of a sericitized porphyric felsic dike with traces of disseminated pyrite.
OSK-W-17-1227 intersected Wolf extension returning 6.56 g/t Au over 3.4 metres, 10.5 g/t Au over 2.0 metres and 4.93 g/t Au over 2.0 metres. The first interval is composed of 2 per cent sphalerite stringers, 3 per cent pyrite stringers and 2 per cent disseminated pyrite hosted in a bleached porphyritic felsic dike. The second interval is composed of 2 per cent disseminated pyrite and 2 per cent pyrite stringers hosted in a moderately sericitized andesite. The third interval is composed of 4 per cent pyrite stringers, 3 per cent disseminated pyrite and 2 per cent quartz-tourmaline veins hosted in a moderately sericitized andesite.
OSK-W-17-1233 intersected 32.7 g/t Au over 2.8 metres in a new zone between the Mallard and zone 27 corridors. Mineralization is at the contact between a rhyolite and a gabbro and composed of 3 per cent disseminated pyrite and 10 per cent quartz veins with strong fuchsite alteration.
OSK-W-17-1239 intersected 4.11 g/t Au over 2.0 metres and 10.4 g/t Au over 2.8 metres in the Caribou corridor. Mineralization is composed of up to 3 per cent pyrite clusters and stringers within a strongly sericitized felsic porphyritic dikes.
OSK-W-17-1247 returned 3.00 g/t Au over 3.0 metres in a new potential area within the Underdog corridor. Mineralization is composed of 1 per cent disseminated pyrite associated with chlorite veins within a felsic dike. The interval is 700 metres southwest of the main deposit.
OSK-W-17-1256 intersected 3.11 over 2.2 metres in Mallard. Mineralization is composed of 1 per cent disseminated or stringer pyrite hosted within a chloritized and weakly sericitized andesite.
OSK-W-17-1264 intersected 6.33 g/t Au over 3.4 metres and 6.88 g/t Au over 2.5 metres in the zone 27 corridor. The first interval, in zone 27 HW, is composed of 20 per cent pervasive pyrite-silica flooding, 2 per cent pyrite-tourmaline stringers within a sericitized rhyolite. The second interval, in zone 27, is composed of 30 per cent pyrite-silica flooding within a sericitized rhyolite.
OSK-W-17-1265 intersected 5.34 g/t Au over 2.3 metres in Caribou extension and 13.0 g/t Au over 2.0 metres in zone 27. The first interval is composed of 10 per cent massive pyrite and 2 per cent pyrite stringers within a silicified porphyritic felsic dike. The second interval is composed of up to 4 per cent pyrite stringers and 45 per cent quartz veins in an silicified andesite.
OSK-W-17-1267 intersect 3.04 g/t Au over 2.4 metres in the Caribou corridor. Mineralization is composed of 3 per cent pyrite clusters, 1 per cent pyrite stringers within a sericitized porphyritic felsic dike.
OSK-W-17-1268 intersected 5.51 g/t Au over 2.0 metres and 9.39 g/t Au over 2.0 metres in the Mallard corridor and 8.17 g/t Au over 3.0 metres and 4.84 g/t Au over 2.1 metres in the zone 27 corridor. The first interval, related to a new zone, is composed of 1 per cent pyrite-silica flooding stringer within a sericitized and silicified rhyolite. The second interval, in Drake, is composed of trace disseminated and stringer pyrite in a felsic porphyritic dike with weak carbonatization and sericitization. The third interval, in zone 27 FW, is composed of 5 per cent pyrite-tourmaline stringers and 5 per cent pyrite clusters in a sericitized and silicified rhyolite. The fourth interval, in zone 27, is composed of up to 30 per cent pyrite within a felsic porphyritic dike.
OSK-W-17-1269 intersected five intervals in the zone 27 corridor: 3.10 g/t Au over 2.5 metres, 3.69 g/t Au over 4.5 metres, 3.09 g/t Au over 3.0 metres, 3.47 g/t Au over 2.4 metres and 3.33 g/t Au over 2.7 metres. The first two intervals are in the zone 27 FW. Mineralization is composed of up to 30 per cent pyrite stringers and up to 2 per cent disseminated pyrite hosted in a porphyritic felsic dike and a strongly sericitized andesite. The last three intervals are in zone 27. Mineralization is composed of up to 4 per cent pyrite stringers within a sericitized and silicified porphyritic felsic dike or an andesite.
OSK-W-17-1270 intersected 3.07 g/t Au over 7.8 metres and 7.14 g/t Au over 2.9 metres in the Caribou corridor. The first interval is in Caribou extension and composed of up to 4 per cent pyrite stringers, 2 per cent disseminated pyrite with locally 5 per cent pyrite and 1 per cent sphalerite hosted in a pervasively silica flooded, sericitized rhyolite. The second interval is composed of 3 per cent quartz clusters in weakly sericitized and bleached andesite.
OSK-W-17-1273 intersected three intervals from the zone 27 corridor: 6.72 g/t Au over 2.1 metres, 16.4 g/t Au over 2.5 metres and 29.2 g/t Au over 2.2 metres. The first interval is composed of 20 per cent pyrite stringers and 1 per cent disseminated pyrite. The second interval is composed of up to 15 per cent semi-massive pyrite and up to 5 per cent pyrite stringers. The third interval is composed of up to 5 per cent pyrite stringers and 1 per cent disseminated pyrite. All the mineralized intervals are within a strongly sericitized rhyolite.
OSK-W-17-1275 intersected 12.4 g/t Au over 2.6 metres in Caribou. Mineralization is composed of up to 1 per cent pyrite stringers within a strongly silicified rhyolite.
OSK-W-17-1276 intersected two intervals within the Mallard zone: 12.6 g/t Au over 2.8 metres and 13.3 g/t Au over 2.0 metres. The first interval is at the contact between a felsic dike and an andesite. The second interval is related to a quartz-tourmaline vein. Mineralization is composed of 3 per cent pyrite stringers, 1 per cent disseminated pyrite and trace of ptygmatic quartz-tourmaline veins. Local visible gold is associated with the quartz-tourmaline vein.
OSK-W-17-1279 intersected 4.56 g/t over 2.2 metres in zone 27. The mineralization is composed of 10 per cent disseminated pyrite and 10 per cent pyrite stringers in a silicified felsic dike.
OSK-W-17-1281 intersected three intervals: 3.24 g/t Au over 2.2 metres in the Caribou corridor, 3.25 g/t Au over 3.0 metres and 3.37 g/t Au over 4.0 metres in zone 27. The first interval is composed of 1 per cent pyrite stringers in strongly sericitized rhyolite. The second and third intervals are composed of up to 15 per cent pyrite in stockworks in a porphyritic felsic dike and a strongly fuchsitized andesite, respectively.
OSK-W-17-1282 intersected zone 27 footwall returning 8.06 g/t Au over 3.1 metres. The mineralization is composed of up to 45 per cent pyrite associated to pyrite-silica flooding and low-core-angle quartz veins hosted in a moderately sericitized rhyolite.
OSK-W-17-1288 intersected 3.44 g/t Au over 2.6 metres Caribou extension. The mineralization is composed of 3 per cent pyrite stringers and 1 per cent disseminated pyrite in a sericitized andesite.
OSK-W-17-1289 intersected three intervals: 5.76 g/t Au over 2.6 metres in zone 27 FW, 5.05 g/t Au over 2.6 metres and 3.22 g/t Au over 2.5 metres in Mallard. The first interval is composed of 20 per cent pyrite stringers and up to 3 per cent disseminated pyrite at the contact between a gabbro and a rhyolite. The Mallard intervals are composed of up to 8 per cent pyrite stingers and up to 10 per cent coarse-grained pyrite hosted in a sericitized andesite.
OSK-W-17-1291 intersected 3.65 g/t over 2.0 metres and 11.4 g/t Au over 2.0 metres in Caribou extension. Both intervals are composed of local pyrite stringers in a weakly sericitized rhyolite.
OSK-W-17-1292 intersected Wolf returning 7.91 g/t Au over 3.1 metres. Mineralization is composed of up to 20 per cent pyrite stringers, locally semi-massive pyrite hosted in a strongly silicified porphyritic felsic intrusion.
OSK-W-17-1293 intersected three intervals in the Caribou corridor. The first interval returned 3.1 g/t Au over 5.3 metres, the second interval returned 3.58 g/t Au over 6.5 metres and the third interval returned 3.63 g/t Au over 2.5 metres. The three intervals are in felsic dikes crosscutting strongly a sericitized andesite. Mineralization is composed of up to 5 per cent pyrite stringers and 3 per cent disseminated pyrite.
OSK-W-17-1296 intersected 5.82 g/t Au over 2.4 metres in zone 27. Mineralization is composed of 3 per cent pyrite stringers in a strongly sericitized rhyolite.
OSK-W-17-1303 intersected 3.74 g/t Au over 2.3 metres in Caribou extension. Mineralization is composed of 3 per cent pyrite stringers within a porphyritic felsic dike.
OSK-W-17-1305 intersected 7.65 g/t Au over 2.5 metres in CS1. Mineralization is composed of up to 25 per cent pyrite stringers within a strongly sericitized andesite at the contact with a felsic dike.
OSK-W-17-1306 intersected 14.7 g/t Au over 2.6 metres in the Caribou corridor. Mineralization is composed of up to 15 per cent pyrite stringers and 3 per cent disseminated pyrite hosted in a moderately bleached and fuchsite-altered andesite. The interval is 150 metres east of OSK-W-17-1147-W1 (7.52 g/t Au over 2.0 metres, reported Oct. 18, 2017).
OSK-W-17-1308 intersected 11.6 g/t Au over 5.4 metres in the Caribou corridor. Mineralization is composed of up to 3 per cent disseminated pyrite, 2 per cent pyrite stringers, local visible gold and smoky quartz vein. The mineralization is hosted in a porphyritic felsic intrusion.
OSK-W-17-1312 intersected 7.56 g/t Au over 3.5 metres related to zone 27 HW. Mineralization is composed of 5 per cent pyrite stringers and 3 per cent pyrite-tourmaline hosted in a sericitized and silicified porphyritic dike.
OSK-W-17-1313 intersected 3.34 g/t Au over 2.1 metres and 5.29 g/t Au over 3.0 metres in Caribou, 11.3 g/t Au over 2.0 metres in zone 27 HW, and 25.2 g/t Au over 2.0 metres in a vein within the Red Dog dike. The first and second intervals are composed of up to 30 per cent pyrite stringers within a sericitized felsic porphyritic dike. The third interval is composed of up to 7 per cent pyrite stingers associated to silica flooding and hosted in a silicified rhyolite. The fourth interval is composed of local visible gold and traces pyrite of clusters.
OSK-W-17-1317 intersected zone 27 returning 10.0 g/t Au over 8.1 metres. Mineralization is composed of up 25 per cent pyrite stringers within a sericitized porphyritic felsic intrusive.
OSK-W-17-1319 intersected zone 27 returning 7.42 g/t Au over 2.0 metres. Mineralization is composed of local visible gold, 6 per cent pyrite stringers and traces of pyrite-tourmaline stringers hosted in a moderately sericitized and patchy silica altered rhyolite near the andesite contact.
OSK-W-17-1320 intersected Caribou extension returning 11.9 g/t Au over 2.0 metres, 5.16 g/t Au over 5.2 metres and 6.04 g/t Au over 2.0 metres. The first interval is within a sericitized and weakly silicified rhyolite and composed of traces of disseminated pyrite clusters. The second interval is composed of 25 per cent semi-massive pyrite, 2 per cent pyrite clusters, 5 per cent pyrite-silica flooding, 3 per cent interstitial sphalerite and 2 per cent disseminated pyrite at the contact between a strongly silicified rhyolite and moderately sericitized felsic dike. The third interval is composed of a chloritized felsic dike with 1 per cent pyrite stringers and traces of disseminated pyrite.
OSK-W-17-1323 intersected 5.48 g/t Au over 2.2 metres in the Caribou corridor. Mineralization is composed of a smoky quartz-carbonate-chlorite vein within a sericitized porphyritic felsic dike with 5 per cent disseminated pyrite and traces of pyrite cluster.
OSK-W-17-1326 intersected zone 27 returning 8.32 g/t Au over 2.0 metres and 6.13 g/t Au over 3.3 metres. The first interval is composed of 10 per cent pyrite stringers and 3 per cent ptygmatic tourmaline veins within a chloritized porphyritic felsic dike. The second interval is composed of 4 per cent pyrite stringers and 3 per cent disseminated pyrite within a sericitized and weakly silicified porphyritic felsic dike.
OSK-W-17-1332 intersected 8.27 g/t Au over 2.0 metres in a new zone between Mallard and zone 27 corridors. Mineralization is composed of 4 per cent pyrite and pyrite-tourmaline stringers within a sericitized porphyritic felsic dike.
OSK-W-17-1333 intersected Caribou extension returning 18.4 g/t Au over 3.5 metres, 4.85 g/t Au over 2.4 metres and 5.89 g/t Au over 2.4 metres. The first interval is composed of 10 per cent pyrite-tourmaline stringers associated with strong pervasive silica flooding and hosted in a sericitized porphyritic felsic dike. Mineralization is at the contact with a sericitized and silicified rhyolite. The second interval is composed of 10 per cent interstitial pyrite and 2 per cent sphalerite within a fragmental rhyolite with strong pervasive silica flooding. The third interval is composed of 2 per cent disseminated pyrite, 1 per cent pyrite stringers, 2 per cent pyrite clusters, and a five-decimetre quartz-tourmaline vein with strong fuchsite, sericite and bleaching in an andesite.
OSK-W-17-1334 intersected 3.31 g/t Au over 2.5 metres, 74.0 g/t Au over 2.5 metres, 12.8 g/t Au over 2.2 metres and 3.73 g/t Au over 3.5 metres in Caribou extension and 29.6 g/t Au over 2.9 metres in zone 27. The first interval is composed of 5 per cent pyrite-silica flooding within a sericitized and strongly silicified rhyolite. The second interval is composed of 30 per cent crustiform veins with local visible gold hosted in a sericitized, silicified and chloritized gabbro. The third interval is composed of 2 per cent pyrite in tourmaline ptygmatic vein, hosted in a sericitized porphyritic felsic dike with fuchsite. The fourth interval is composed of 5 per cent pyrite stringers, 1 per cent tourmaline ptygmatic veins within a fuchsitized, sericitized, silicified and chloritized porphyritic felsic dike. The fifth interval is composed of 10 per cent pyrite stringers within a sericitized, chloritized and bleached gabbro.
OSK-W-17-1335 intersected Mallard returning 5.66 g/t Au over 2.1 metres. Mineralization is composed of 10 per cent pervasive pyrite-silica flooding and 3 per cent pyrite in tourmaline ptygmatic veins within a sericitized and chloritized rhyolite at the contact with a chloritized andesite.
OSK-W-17-1337 intersected the Drake zone in the Mallard corridor returning 3.58 g/t Au over 2.1 metres. Mineralization is composed of up 50 per cent pyrite and pyrite-tourmaline stringers within a sericitized and weakly silicified andesite.
OSK-W-17-1341 intersected 3.43 g/t Au over 2.0 metres, 17.0 g/t Au over 2.3 metres, 7.79 g/t Au over 2.9 metres, 4.52 g/t Au over 5.1 metres and 5.23 g/t Au over 2.3 metres. The first interval, in Caribou, is composed of 15 per cent pyrite and pyrite-tourmaline stringers within a sericitized and weakly silicified rhyolite. The second interval, in zone 27 HW, is composed of 10 per cent pyrite in pervasive silica flooding within a sericitized and silicified porphyritic felsic dike. The third interval, in zone 27, is composed of 7 per cent disseminated pyrite, 2 per cent pyrite in quartz-tourmaline veins within a sericitized porphyritic felsic dike. The fourth interval, in zone 27, is composed of 4 per cent disseminated pyrite within a sericitized and chloritized andesite. The fifth interval, in zone 27, is composed of 7 per cent pyrite stringers within a sericitized and weakly silicified andesite.
OSK-W-17-1342 intersected Mallard returning 3.30 g/t Au over 2.0 metres. Mineralization is composed of up to 10 per cent pyrite stringers and pyrite clusters within a sericitized and chloritized andesite.
OSK-W-17-1344 intersected 9.54 g/t Au over 2.4 metres in Caribou corridor. Mineralization is composed of 3 per cent pyrite-tourmaline stringers and 1 per cent pyrite quartz-tourmaline veins within a sericitized and silicified porphyritic felsic dike.
OSK-W-17-1345 intersected 7.40 g/t Au over 2.5 metres and 86.7 g/t Au over 4.3 metres in the Caribou corridor. The first interval, in the Caribou extension, is composed of up to 90 per cent pyrite in a pervasive silica flooding, hosted in a silica and sericite altered rhyolite. The second interval is in Wolf: High-grade mineralization is composed of one gold stringer with 8 per cent pyrite, 5 per cent chalcopyrite and 3 per cent sphalerite over a 40-centimetre zone of pervasive silica flooding hosted in a silicified felsic intrusive.
OSK-W-17-1348 intersected Caribou extension returning 4.25 g/t Au over 2.0 metres. Mineralization is composed of traces of disseminated pyrite within a silicified, sericitized and chloritized porphyritic dike. The fragmental felsic unit is 20 per cent injected with quartz-tourmaline veins.
OSK-W-17-1350 intersected four intervals related to the Caribou extension: 9.37 g/t Au over 2.0 metres, 4.45 g/t Au over 2.0 metres, 6.33 g/t Au over 2.0 metres and 6.88 g/t Au over 3.4 metres. The first interval is composed of a crustiform vein with quartz-carbonate-tourmaline and 7 per cent pyrite hosted in a strongly sericitized rhyolite. The second interval is composed of 3 per cent pyrite-tourmaline stringers and local visible gold associated with quartz-tourmaline veins. The porphyritic felsic dike is strongly silica, sericite and chlorite altered. The third interval is composed of 5 per cent disseminated pyrite clusters and disseminated chalcopyrite within a sericitized and weakly chloritized porphyritic felsic dike. The fourth interval is composed of local visible gold, 7 per cent disseminated pyrite and 2 per cent ptygmatic tourmaline veins at the contact between a sericitized porphyritic felsic dyke and an andesite.
OSK-W-17-1351 intersected 6.14 g/t Au over 2.2 metres, 3.65 g/t Au over 2.2 metres and 3.64 g/t Au over 2.3 metres in the Caribou corridor. The first interval is composed of 10 per cent pyrite-silica flooding, 3 per cent pyrite stringers within a sericitized and strongly silicified porphyritic felsic dike. The second interval, in the Caribou extension, is composed of 5 per cent pyrite stringers within a sericitized andesite. The third interval, in the Caribou extension, is composed of up to 3 per cent pyrite stringers and quartz-tourmaline veins in a silicified andesite.
OSK-W-17-1359 intersected 5.06 g/t Au over 2.6 metres, 5.37 g/t Au over 2.3 metres, 3.87 g/t Au over 2.1 metres in Caribou corridor and 4.98 g/t Au over 2.2 metres in zone 27 corridor. The first interval is composed of 60 per cent semi-massive pyrite with sphalerite in pervasive silica flooding and 1 per cent pyrite in ptygmatic tourmaline veins hosted in a silicified rhyolite. The second interval is composed of 3 per cent pyrite-tourmaline stockwork, 5 per cent pyrite in quartz-tourmaline veins and 40 per cent semi-massive pyrite with tourmaline, all hosted in a strongly silicified rhyolite. The third interval is composed of 2 per cent pyrite-silica flooding and 2 per cent quartz-tourmaline veins within a sericitized and strongly silicified rhyolite. The fourth interval is composed of 6 per cent pyrite-tourmaline stringers, tourmaline ptygmatic veinlets and 1 per cent disseminated pyrite within a sericitized porphyritic dike.
OSK-W-17-1368 intersected 8.71 g/t Au over 2.0 metres in the Caribou extension. Mineralization is composed of 5 per cent pyrite-tourmaline stringers hosted in a silicified and sericitized felsic dike.
OSK-W-17-1369 intersected 14.8 g/t Au over 2.0 metres in zone 27. Mineralization is hosted in a sericite-altered felsic porphyritic intrusion and composed of 5 per cent pyrite in smoky quartz veins.
OSK-W-17-1371 intersected 5.63 g/t Au over 2.6 metres in the Caribou corridor. Mineralization is composed of 8 per cent disseminated pyrite, 3 per cent pyrite stringers and 2 per cent pyrite-tourmaline veins associated with pervasive silica flooding and hosted in a felsic dike.
OSK-W-17-1381 intersected 7.60 g/t Au over 3.2 metres in the Caribou extension corridor. Mineralization is composed of 3 per cent pyrite stringers and 10 per cent pyrite in a 30-centimetre quartz vein hosted in a sericitized felsic porphyritic dike.
Qualified person
The scientific and technical content of this news release has been reviewed, prepared and approved by Louis Grenier, MScA, PGeo (OGQ 800), project manager of the Windfall Lake gold project, who is a qualified person as defined by National Instrument 43-101, Standards of Disclosure for Mineral Projects.
Quality control and reporting protocols
True widths determinations are estimated at 65 per cent to 80 per cent of the reported core length intervals for most of the zones. Assays are uncut except where indicated. Intercepts occur within geological confines of major zones but have not been correlated to individual vein domains at this time. Reported intervals include minimum weighted averages of 3.0 g/t Au diluted over core lengths of at least 2.0 metres. All NQ core assays reported were obtained by either one-kilogram screen fire assay or standard 50-gram fire assaying, AA finish or gravimetric finish, at ALS Laboratories in Val d'Or, Que., Thunder Bay and Sudbury, Ont., or Vancouver, B.C., or Bureau Veritas in Timmins, Ont. The one-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multielements, including silver, using an aqua regia ICP-AES method at ALS Laboratories. Drill program design, quality assurance/quality control (QA/QC) and interpretation of results are performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the corporation as well as the lab. Approximately 5 per cent of sample pulps are sent to secondary laboratories for check assay.
About the Windfall Lake gold deposit
The Windfall Lake gold deposit is located between Val d'Or and Chibougamau in the Abitibi region of Quebec, Canada. The mineral resource defined by the previous operator comprises 2,762,000 tonnes at 8.42 g/t Au (748,000 ounces) in the indicated category and 3,512,000 tonnes at 7.62 g/t Au (860,000 ounces) in the inferred category (sourced from a technical report dated June 10, 2015, entitled "Preliminary Economic Assessment of the Windfall Lake Gold Property, Quebec, Canada," with an effective date of April 28, 2015, prepared in accordance with NI 43-101). The Windfall Lake gold deposit is currently one of the highest-grade resource-stage gold projects in Canada. The bulk of the mineralization occurs in the Main zone, a southwest/northeast-trending zone of stacked mineralized lenses, measuring approximately 600 metres wide and at least 1,400 metres long. The deposit is well defined from surface to a depth of 500 metres and remains open along strike and at depth. Mineralization has been identified only 30 metres from surface in some areas and as deep as 870 metres in others, with significant potential to extend mineralization up and down plunge and at depth.
About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration and development of precious metal resource properties in Canada. Osisko holds a 100-per-cent interest in the high-grade Windfall Lake gold deposit located between Val d'Or and Chibougamau in Quebec and holds a 100-per-cent undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100-per-cent interest in the Marban project located in the heart of Quebec's prolific Abitibi gold mining district, and properties in the Larder Lake mining division in Northeastern Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past-producing mine, and the Gold Pike mine property. The corporation also holds interests and options in a number of additional properties in Northern Quebec and Ontario. Osisko continues to be well financed with approximately $190-million in cash and investments.
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