Bathurst Mining Camp

The Bathurst Mining Camp is a mining district in northeast New Brunswick, Canada, centred in the Nepisiguit River valley, and near to Bathurst. The camp hosts 45 known volcanogenic massive sulfide (VMS) deposits typical of the Appalachian Mountains. Some of the ore is smelted at the Belledune facility of Xstrata. Although the primary commodity is zinc, the massive-sulphide ore body produces lead, zinc, copper, silver, gold, bismuth, antimony and cadmium.[1]

History

Loring Bailey, the professor of geology at UNB in 1864, wrote that:[1]

I may yet say that in no part of the Province have I been so much pleased with the prospects of mineral wealth and the probability of valuable discoveries as in the eastern portion of Gloucester County ... I have no doubt that the discovery of extensive and valuable metalliferous lodes would be the reward of a thorough and intelligent exploration of this district.

The Bathurst Mining Camp was the location of an iron mine, for a time ending early in the 20th century. The Northern New Brunswick and Seaboard (NNB&S) railroad was built from the Intercolonial Railway line near Bathurst approximately 17 miles up the Nepisiguit River to service the mines, but had a short history, terminating in 1918 when it officially ceased operation due to the closure of the iron mine in 1913. The railroad passed into the hands of the provincial government, who were the guarantors of the bonds financing the NNB&S. By 1959 the provincial government had all of the remaining rails lifted.[2]

A massive sulphide orebody was discovered in 1953.[3]

In 1963 the 14 mile line to Brunswick Mines from Nepisiguit Junction was rebuilt by Canadian National Railways to serve the then-projected zinc mine resulting from the 1953 discovery.[2]

Zinc production at Brunswick Mine began in 1964.[3][1]

On 9 March 1987, a derailment occurred at Nepisiguit Junction when a runaway CN train journeyed from Brunswick Mines to just short of the wye. There was a mixup in communications and the engineer ended up with more cars on his train than he thought, and the brakes on the engine alone were unable to hold the train on the grade in the Brunswick Mines yard. After a harrowing journey at speeds up to 70 mph the engines derailed on the sharp curve into the wye at Nepisiguit Junction. Both units and most of the 30-car train derailed, but the engineer was not seriously injured.[2]

The zinc mine operated continuously since 1964 until April 2013, surviving economic ups and downs and four major changes in ownership to produce approximately 150 million tonnes of ore at grades of 8.46% Zn, 3.33% Pb, 0.37% Cu, and 99 g/t Ag.[3]

Geology

The Geology of the Bathurst Mining Camp (BMC) is a base metal copper, lead and zinc mainly volcanogenic hosted mineral rich area of north central New Brunswick. BMC geology is diverse having experienced considerable tectonic activity from the Ordovician to the Jurassic periods.

Geological activity accumulated sulfide minerals into local vent complex sea floor basalts, creating VHMS volcanogenic hosted massive sulfide and SEDEX sedimentary exhalative deposit depositional environments, which were all later accreted and folded onto the margin of the continental crust which formed the Appalachian Mountains during numerous mountain building events. Additionally the east coast was a highly active regional geological zone experiencing volcanism similar to the Yellowstone along the edge of the Appalachian Mountains of New Brunswick and Maine.

The BMC land area is the grave yards of both the Iapetus and Rheic ocean basins which were subducted under the thicker continental crust and down into the mantle.

The region is mainly known for VHMS and SEDEX environments while it also hosts epithermal, mesothermal and a number of other mineral deposit forming environments. VHMS and SEDEX environments are the primary mineral hosting dynamics producing base and precious metals. Gold and silver are generally low grade associated with zinc and lead rich areas. The gold and silver are present as invisible disseminations within other minerals.

The BMC country rock is also highly intruded by magma plumes. One such plume is on Mount Edward, part of the Notre Dame Mountains, which was exposed by glacial erosion.

Faults

In 2007 there were commonly held to be four major fault lines in the area.[4] The Miramichi fault was the site on 9 January 1982 of a significant earthquake.

  • Rocky Brook-Millstream fault, near the Millstream River and falls[5]
  • Heath Steele fault
  • Catamaran fault
  • Miramichi fault

Deposits
  • Nepisiquit A, B, C
  • Camelback
  • Halfmile Lake
  • Orvan Brook

Mines
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See also

References
  1. "nbm-mnb.ca: "Magnificent Rocks - Brunswick Mines, Bathurst"". Archived from the original on 2016-03-22. Retrieved 2016-08-16.
  2. traingeek.ca: "Nepisiguit Junction"
  3. canadianminingjournal.com: "CLOSURE: Brunswick mine closes on a high note", 30 Apr 2013
  4. smu.ca: Jutras, McRae and Utting - "Viséan tectonostratigraphy and basin architecture beneath the Pennsylvanian New Brunswick Platform of eastern Canada" BULLETIN OF CANADIAN PETROLEUM GEOLOGY VOL. 55, NO. 3 (SEPTEMBER, 2007), P. 217–236
  5. waterfallsnewbrunswick.ca: "Millstream Falls"

Bibliography
  • Luff, William M. (October 1995), "A history of mining in the Bathurst area, northern New Brunswick, Canada", CIM Bulletin, Canadian Institute of Mining and Metallurgy

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