The Thunder Creek and 144 properties are part of the Timmins West mine complex in Ontario. The deposits all occur along the 144 Trend, a broad and extensive structural corridor that is host to significant gold mineralization. The gold occurs in steep north-northwest plunging zones which are in proximity to the 144 Trend and related structures.
Thunder Creek is an underground mine that has been in production since 2010 and has produced more than 500 kozs of gold. The current mine plan forecasts 2017 production to average 1,400 tpd from Thunder Creek at grades of approximately 4.0 g/t. Primary mining methods include longitudinal and transverse longhole mining and ore is hoisted to surface via a shaft and is trucked to the Bell Creek mill for processing. Ore is processed by single-stage crushing and single stage grinding with a portion of the gold recovered by gravity methods followed by pre-oxidation and cyanidation with carbon-in-leach and carbon-in-pulp recovery. Recoveries averaged 96% in the first nine months of 2017. The Probable Reserves at Thunder Creek as of May 2017 totaled 0.7 Mt at 3.1 g/t gold (2.0 g/t cut-off).
Drilling activity at the 144 project led to the discovery of two significant zones of gold mineralization about 750 metres to the southwest of Thunder Creek, the 144 Gap Zone and the 144 Gap SW Zone. The Proven and Probable Reserves as of May 2017 at 144 are 5.2 Mt grading 3.1 g/t for 525 kozs of gold (2.0 g/t cut-off).
Progress continued to be made on the infrastructure at 144 Gap which included ramp, raise and lateral development to access the resource. Underground infill and definition drilling has totaled 92,300 metres during the first three quarters of 2017.
Updated Mineral Resources and Mineral Reserves were reported for the Timmins West project, including from Thunder Creek and 144. The 144 Gap deposit contributed significant growth to the overall reserves.