Blakelock covers 15 kilometres of the prolific Casa Berardi Deformation Zone.
Blakelock is located in northeastern Ontario along the Casa Bérardi Deformation Zone (“CBDZ”) in the western part of the northern Abitibi Greenstone Belt (“Northern Abitibi,”). The property covers a 15 kilometre-long portion of this prolific deformation corridor that includes the Casa Berardi Gold Mine located 60 kilometres to the east and currently being operated by Hecla Mining Co. The property is under option from Lake Shore Gold Corp., a subsidiary of Tahoe Resources Corp., and LaSalle could obtain the full ownership by spending $400,000 in exploration expenditures by late 2020.
Historically since the late 1980’s, several major companies have encountered gold mineralization in diamond drill intersections over the property, demonstrating the potential for high grade lode gold deposits, among them:
Placer Dome (1989); 2.16 g/t Au over 1.2 m,
Esso Minerals (1988) 10.9 g/t Au and 95.7 g/t Ag over 10.25 m including 0.4 m @ 210 g/t Au and 1200 g/t Ag,
Lake Shore Gold Corp (2008-2012) 1.26 g/t Au over 5.9 m and 11.53 g/t Au over 6.0 m including 81.9 g/t Au over 0.7 m.
Reverse circulation “RC” drilling was also done by Inco and Esso Minerals and revealed several basal till anomalies but their bedrock source(s) remain untested.
Outcrops are sparse and the property geology is largely interpreted utilizing historical drill hole information combined with airborne magnetics. The geology of the property is composed of a volcano-sedimentary package intruded by numerous intermediate to felsic dykes and late stocks comprised between two granitic masses. All the rocks were metamorphosed to a greenschist, to a local low amphibolite, metamorphic facies. Volcanic rocks vary from mafic to intermediate massive to pillowed basalts overlaid by intermediate to felsic tuffs and sediments consisting of biotite rich greywacke, conglomerate, siltstone and iron formation. All the rocks are intruded by feldspar-quartz porphyries and have been cut by late diabase dykes. The rocks on the property have a general east-northeast orientation and are dipping to the north at 70 degrees. A strong linear magnetic fabric suggests the continuation of the important Casa Berardi deformation corridor through the southern half of the property, further supported by schistose rocks reported from RC drill holes.
Several types of alteration are observed in different part of the property, most commonly sericite, biotite, silica and chlorite. A pink alteration of some feldspar porphyries suggests a potassic alteration though a weak hematization could also cause the coloration, both of which could represent indicators of hydrothermal processes commonly associated with gold mineralizing events.
The gold mineralization seems to occur in different environments, often near the contact volcanic/porphyry, within porphyries, in association with pyrite or in quartz (±tourmaline) veins. Several grains of gold are reported in RC drill holes in the basal till and values reaching 5.3 g/t Au in the heavy mineral fraction are reported. A NI43-101 compliant report is in progress for the Blakelock property.