The company’s 100%-owned Clearwater Project hosts the Eau Claire gold deposit, as well as the Snake Lake Target located 1.3 km to the east of Eau Claire.
“With a focus on infill drilling ahead of our planned Preliminary Economic Assessment later this year, today’s results continue to demonstrate elevated gold grades and vein continuity within the shallow underground portion of the Eau Claire deposit,” said Claude Lemasson, Eastmain’s President & CEO.
“With results from around 1/3 of our drill program already reported and over half of our drilling completed, we’ve accumulated significant near-surface and shallow underground data which will reinforce our mineral resource update expected around mid-year.”
Highlights from Eau Claire intercepts:
At Eau Claire, assay results from 26 infill and step-out drill holes (8,306 m) continue to establish continuity while testing the limits of an open pit and shallow underground mining concept. Since commencing our current drill program in August, a total of 59 exploration and infill drill holes (19,542 m) have been reported. Over half (34,756 m) of our planned drill program (63,300 m) is now complete with assays pending on eleven holes. Drilling continues with 5 rigs on site and completion of the drill program expected in early Q2/2017.
In addition, one drill hole (262 m) in the Snake Lake Deformation Corridor intersected both Eau Claire-style shear-hosted quartz-tourmaline gold mineralization and sulphide-rich volcaniclastic hosted gold mineralization.
The focus of the 2016/early 2017 drill program, consisting mainly of infill drilling, is to generate additional data to:
To date, the program has been successful in defining grades and establishing continuity characteristic of Eau Claire’s current resource model. This enhanced understanding is expected to play a key role in supporting a Preliminary Economic Assessment (“PEA”) expected around year-end.
In addition to infill, a smaller portion of the current program is focused on extending the main Eau Claire deposit laterally to the east. Recent step-out drilling conducted 100 m east of the Eau Claire deposit encountered mineralization in drill hole ER16-660, 4.60 g/t Au over 0.7 m, and remains open to the east. Beyond the main Eau Claire deposit, satellite targets such as Snake Lake and Clovis Lake have returned encouraging results from previous exploration which warrant further exploration. Located 1.3 km east of Eau Claire, Snake Lake 2016 drilling has returned gold mineralization in 13 of 17 drill holes reported to date over an 800 m strike length within a 250 m corridor.
Drilling results – Eau Claire
Step-out drilling tested the eastern extent of the of Eau Claire mineral resource, primarily for extensions beyond the known veins horizons. Holes ER16-657 and -651 tested the extension of veins to a vertical depth of 200 m, located 25 m west and 25 m west and up-dip of previous intercepts. The holes returned values consistent with the HGS-04 vein domain. Hole 646 tested the same structure 25 m further west returning similar values. Of particular interest is hole ER16-660 located 150 m east of hole-657, at a vertical depth of 283 m, which may indicate an extension to these zones. The hole targeted an area of limited historic drilling and further testing of the area will be undertaken later in 2017.
Holes ER16-659 intersected possible intersections of the A Vein (2.0 m of 10.6 g/t Au) and VSM 34 domains. Hole-661 and -663 also tested the VSM 34 domain on the shallow eastern extension of the Eau Claire mineral resource. Both -659 and -663 holes returned narrow intervals of gold mineralization at vertical depths of less than 100 m.
Hole ER16-650 undercut the cluster of reported infill holes (ER16-635, -639, -642, -645 and -655), drilled into the current resource to intersect veins HGV H2, HGV 32 and HG S7 and associated Swarm Domains at vertical depths ranging from 200 m to 300 m. Hole -650 intercepted two 0.5 m intervals in the lower portion of the resource of 6.84 g/t Au (HG H2) and 8.98 g/t Au (VSM 39) and a deeper intercept below the current envelope at 376 m grading of 3.15 g/t Au over 1.0 m which may be a down-dip extension of Vein HG S7.
Drilling results – Snake Lake
Eastmain is reporting one exploration drill hole (282 m) at the Snake Lake Target. 17 holes are now complete with assays pending on the final three drill holes. Hole ER16-626 intercepted two subparallel zones currently interpreted to extend along 800 m of strike length within the Snake Lake Deformation Corridor. The shallower intercept, at 40 m vertical depth, cuts an altered porphyry dyke within a package of volcaniclastic metasediments. Similar mineralization ranging from 9.13 g/t Au over 1.5 m in hole ER16-592 (west) to 0.45 g/t Au over 7.6 m in hole ER16-604 (east) has been intercepted along a 095degree east-west trend for 650 m.
The second intercept in hole ER16-626 is related to a zone of quartz-tourmaline vein bearing schist (in metasediments), at 82 m vertical depth, which appears to trend east-west at 080degree for approximately 500 m. Values along this trend range from 2.38 g/t Au over 6.70 m in hole ER16-592 (including 4.89 g/t Au over 2.1 m) (west) to 2.45 g/t Au over 2.5 m in hole ER16-599 (east). Further interpretation followed by drilling is anticipated later in 2017 to test strike and dip extensions of these zones.
Gold mineralization – Eau Claire
Gold mineralization at the Eau Claire gold deposit is generally located within structurally-controlled, high-grade en-echelon quartz-tourmaline veins and adjacent altered rocks. The vein system is predominantly hosted within a thick sequence of massive and pillowed mafic volcanic flows, interbedded with narrow intervals of volcaniclastic sedimentary rocks. Both flows and sediments have been intruded by multiple phases of felsic and porphyry dykes. Host rocks have been folded and deformed (sheared) through several deformation events. The gold bearing veins may occur as thin fracture fill with tourmaline and develop along an easterly strike and a southerly dip (450W zone) into thick quartz-tourmaline veins with zoned tourmaline+/-actinolite+/-biotite+/-carbonate alteration halos which can measure up to several metres in thickness.
SRK Consulting (Canada) Inc. (“SRK”) completed “Technical Report and Mineral Resource Estimate for the Eau Claire deposit”, which reported Measured and Indicated Mineral Resources of 7.225 Million tons grading 4.09 g/t Au (951,000 ounces) of gold and Inferred resources of 3.88 Million tons grading 3.88 g/t Au (633,000 ounces) of gold. The report has an effective date of April 27, 2015 and is filed on Eastmain’s SEDAR profile dated June 11, 2015.
Gold mineralization – Snake Lake
Gold mineralization at the Snake Lake occurrence is similar to the Eau Claire deposit. Quartz tourmaline veins are hosted within a thick sequence of basalt flows, tuffs and interbedded metasedimentary rocks which have been intruded by felsic dykes. As at Eau Claire, the entire sequence has been heavily deformed and sheared resulting in development of a deformation zone with strong and extensive foliation and local shearing. Significant zones of sulphide mineralization (pyrite, pyrrhotite, +/- arsenopyrite +/- chalcopyrite) are also reporting gold mineralization within the deformation zone.
Story by ProactiveInvestors