NYSE:
MUX

$2.03
+0.08 +4.1% Volume: 2,398,834 November 17, 2017
TSX:
MUX

$2.59
+0.12 +4.86% Volume: 158,531 November 17, 2017
Gold
$1,294.35
+0.00 +0% Volume: November 19, 2017
Silver
$17.06
+0.11 +0.63% Volume: 1 November 16, 2017
Copper
$3.04
-0.01 -0.18% Volume: 338 November 16, 2017

BLACK FOX COMPLEX

About Black Fox Complex

Located in Timmins

The Black Fox mine is located in the well-established Timmins Gold Mining Camp in Northern Ontario, Canada. It is positioned approximately 10 kilometres east of the town of Matheson, 65 kilometres east of the city of Timmins, and adjacent to Provincial Highway 101. The 1,750 hectares of contiguous land covers a significant section of the Destor-Porcupine Fault Zone, which has a total strike length of approximately 200 kilometres and hosts many of Ontario’s richest gold mines.

The Black Fox Mine is the key component of the Black Fox Complex, which was acquired by McEwen Mining in October 2017. The Complex includes the Black Fox-Stock mill and the Grey Fox development project.

Commercial production from the open pit occurred between May 2009 and September 2015, while underground mining commenced in October 2011. Existing infrastructure was upgraded as of 2010 and included a new truck shop, laboratory, administration building, firewater/freshwater pump house, and other ancillary buildings. Given the mine’s proximity to the town of Matheson and the city of Timmins, and that this region’s primary industries are mining and forestry, local supplies and services are easily available and can be typically delivered within 12 hours.

Water at Black Fox is supplied via an on-site fresh water well, and water produced from dewatering activities is channelled to the holding pond for process recycling and/or discharge through the Black Fox water treatment facility. The Stock property surrounding the Black Fox-Stock mill is also the site of the former Stock Mine, which produced 137,000 ounces of gold from an underground operation between 1989-2005. Electricity is supplied to the mill from a local 27 kilovolt power line.

Mining and Processing

Commercial production from the underground mine began in October 2011. Underground ore is produced using a combination of long hole stoping, cut and fill, and narrow vein mining methods. Ore is accessed from a series of declines branching off from the main ramp to surface. The underground mine at Black Fox begins at bottom of the open pit (approximately 200 metres below surface) and is expected to extend to more than 800 m in depth below surface. Backfilling is done with a combination of mine waste rock mixed with a Portland cement slurry mix. Ore mined at Black Fox is initially crushed on-site and transported by road trucks to the Black Fox mill site located 28 kilometres away, and fed via a conveyor system to the mill’s crushing circuit.

The crushed product is transferred to a 1,500 tonne fine ore surge bin, and then fed into 2,400 tonnes per day grinding circuit, which includes two stages of closed circuit ball milling. Soluble gold is recovered by adsorption upon granular activated carbon in CIC, CIL, and CIP trains with a process efficiency of 90% to 95%. Gold is removed from the carbon in a high temperature strip vessel in a closed circuit with electro-winning deposition. Gold plate is further refined by induction smelting and cast into molds before shipment to the refinery.