Pogo mine

Last updated
Pogo Gold Mine
Location
USA Alaska location map.svg
Schlaegel und Eisen nach DIN 21800.svg
Pogo Gold Mine
Location Delta Junction
Alaska
Country United States
Coordinates 64°27′0″N144°54′44″W / 64.45000°N 144.91222°W / 64.45000; -144.91222 Coordinates: 64°27′0″N144°54′44″W / 64.45000°N 144.91222°W / 64.45000; -144.91222
Production
Products Gold
Production205,878 troy ounces [1]
Financial year2020
History
Discovered1995
Opened2006
Owner
Company Northern Star Resources
Website www.nsrltd.com
Year of acquisition2018

The Pogo mine is a gold mine in the state of Alaska. [2] By 31 December 2017 Pogo had produced 3.6 million ounces of gold at a grade of 13.6 g/t. Annual production for 2020 was 205,878 ounces. [1] At 31 December 2019 the mine had Proven and Probable Reserves of 1.5 million ounces of gold at a grade of 7.5 g/t (JORC). [3] It is located 30 miles (48 km) northeast of Delta Junction and 90 miles (145 km) east of Fairbanks. [4] Northern Star Resources Ltd announced in May 2020 that it had entered into an agreement with the Japan based Sumitomo Metal Mining Co and Sumitomo Corp to acquire the Pogo Gold mine.

Contents

Orebody and mining method

The orebody consists of numerous highly irregular quartz veins, ranging in thickness from 2 to 40 ft (0.61 to 12.19 m) with 8 to 20 ft (2.4 to 6.1 m) being typical, and ranging in dip from horizontal to vertical with 30-45 degrees being normal. A complex system of faulting offsets the veins both parallel and perpendicular to the strike, resulting in a "chopped-up" orebody. Until 2019 the mine utilized drift-and-fill and overhand cut-and-fill mining methods when, under new owner Northern Star Resources, the mining method was changed to longhole stoping. Access to the orebody is via decline and spiral ramp. After blasting, ore is trucked to the central underground "ore bin", where it is then fed to a conveyor that takes it out of the mine directly to the mill. Typical daily production is about 2,500 tons of ore yielding approximately 1,000 troy ounces of gold. [5]

Pogo uses a paste backfill system, where 20% of the mine's tailings from which gold has been extracted are mixed with cement and then pumped back underground to support subsequent further excavation. This has the additional environmental benefit of reducing the amount of tailings that need to be stored on surface, minimizing the footprint of the mine's dry-stack tailings storage facility. [6]

Moose incident

On October 5, 2004, during construction of the mine, a large moose with 60-inch (1.5 m) antlers got entangled in newly laid power cables and inadvertently lifted into the air as the cables were tensioned. After retrieval, the moose was in distress and was shot. [7]

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References

  1. 1 2 "Production at top end of guidance, unaudited NPAT of ~A$75M-85M and debt cut by A$125M". Subiaco, WA: Northern Star Resources. 21 January 2021. Retrieved 5 December 2021.
  2. ↑ "New Ore Deposit Identified in Pogo Gold Mine, Alaska, USA" (PDF). sumitomocorp.co.jp. 2012. Retrieved 2013-06-23.
  3. ↑ "Northern Star set for further production growth as Reserves and Resources jump +30%" (PDF). Subiaco, WA: Northern Star Resources. 1 August 2019. Retrieved 2 June 2020.
  4. ↑ "Northern Star acquires the Tier-1 Pogo Gold Mine in Alaska for US$260M" (PDF). Northern Star Resources. Subiaco, WA. 30 August 2018. Retrieved 29 April 2019.
  5. ↑ "Quarterly Activities Report – March 2019" (PDF). Subiaco, Western Australia: Northern Star Resources. 24 April 2019. Retrieved 2 June 2020.
  6. ↑ "Northern Star Pogo Operations Fact Sheet" (PDF). Northern Star Resources Limited. Subiaco, WA. December 2018. Retrieved 30 April 2019.
  7. ↑ "Moose Accidentally "Hangs Out" 50 Feet in the Air". www.montanaoutdoor.com. Retrieved 2021-12-02.
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