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United States
Middle Tennessee Complex

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 Location:
38 km N from Cookeville, Tennessee, United States

  Address:
(P.O. Box 188)120 Zinc Mine Circle
Gordonsville
Tennessee, United States
38563
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Fax+1 615 683 6568
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
Mining Method
  • Longhole stoping
  • Room-and-pillar
Production Start...
Mine Life20 years (as of Jan 1, 2021)
Middle Tennessee Complex is comprised of three underground zinc mines: Gordonsville, Cumberland, Elmwood, and a processing plant located at the Gordonsville mine site.

In July 2019, Nyrstar’s operating business became majority owned by Trafigura. Production numbers have not been publicly available since then.


Owners

Source: p. 124
CompanyInterestOwnership
Trafigura Group Pte Ltd. 98.5 % Indirect

Contractors

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Deposit Type

  • Mississippi Valley Type


Summary:

The MTM Project is a classic example of a Mississippi Valley Type ("MVT") Pb-Zn deposit.

Brecciation and zinc mineralization is associated with the Lower Ordovician upper Knox Group, which is the unit of interest on the MTM Project. The main members of upper Knox Group are the Mascot Dolomite and the Kingsport Formation. The Mascot Dolomite consists of predominantly very finely crystalline dolostone units of various shades of brown and gray interbedded with some limestone units or their dolomitized medium and coarsely crystalline equivalents. The very finely crystalline dolostones are considered to be primary in origin, that is, they formed very early in the history of the strata regardless of the exact dolomitization mechanism(s). The thickness of the Mascot ranges from 759 to 847 ft.

The upper Mascot includes the interval from the Knox unconformity to the M-3 marker. Thickness of this section is very variable primarily due to removal of upper units by pre-Chazyan erosion; in some areas of Central Tennessee most of the interval is missing. In Smith and Trousdale counties (the MTM Project area), the upper Mascot ranges from about 135 to 225 ft.

The upper part of the late breccia systems host the main economic zinc deposits. Sphalerite, fluorite, barite, marcasite, pyrite, calcite, dolomite, and quartz form varying proportions of the cement of the mineral-matrix breccia. Economic grade occurrences of sphalerite are not distributed uniformly th ........


Mining Methods

  • Longhole stoping
  • Room-and-pillar


Summary:

Currently, three underground mines are in operation, Gordonsville, Cumberland and Elmwood.

Underground mining uses mechanized room-and-pillar and longhole mining methods. Ore is hauled to the shafts in underground trucks, hoisted to surface and conveyed to the ROM in the case of Gordonsville and truck hauled to the ROM in the case of Elmwood.

An open stope design and typical development layouts for drilling and extraction commences with production drilling either 76 mm upholes from the stope undercut or 102 mm downholes from a sub level depending on stope geometry and access constraints. Production holes are then loaded with ammonium nitrate fuel oil (ANFO) or ammonium nitrate emulsion (ANE) and blasted using modern electronic detonation and initiation systems. Stope blasting is conducted in a series of blast packets which
comprise a series of vertical rings grouped based on optimization of Zinc grade and available blasting void. The initial void is established by firing a blind slot raise followed by subsequent firing of production rings into the initial void. Blasted ore is remote mucked from the stope undercut to a designated remote stockpile where it is subsequently free-mucked to mine trucks and hauled to the nearest production shaft and hoisted to the surface to be transferred to the mill.

The depth of the mining areas appeared to be about 700 ft below surface (based on 7 deg decline, 5,500 ft long).

The primary mining f ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits2018201720152014
Zinc Metal in concentrate kt 39224747
Zinc Concentrate kt 60347474
Subscription required - Subscription is required.

Operational Metrics:

Metrics20182017201520142013
Tonnes milled 1,389 kt of ore769 kt of ore1,482 kt of ore1,555 kt of ore1,648 kt of ore

Reserves at December 31, 2018:
A cut-off grade of 2.0% Zn has been applied in the estimation of Mineral Resources for all mines

CategoryTonnage CommodityGrade
Proven 0.16 Mt Zinc 4.5 %
Probable 2.19 Mt Zinc 3.3 %
Proven & Probable 2.35 Mt Zinc 3.4 %
Measured 0.18 Mt Zinc 4.7 %
Indicated 3.67 Mt Zinc 3.4 %
Measured & Indicated 3.86 Mt Zinc 3.5 %
Inferred 16.01 Mt Zinc 3.5 %

Operating Costs:

Units20182017
Direct operating costs ($/t milled) USD 6560



Heavy Mobile Equipment as of December 31, 2021:
HME TypeSize
Bolter
Drill jumbo (two boom)
Load-Haul-Dump (LHD) 17 t
Truck (haul) 30 t

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Other 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
Annual Report 2018
Fact Sheet 2018
Press Release 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Fact Sheet 2017
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2016
Annual Report 2015
Year-end Mineral Reserves 2015
Annual Report 2014
Year-end Mineral Reserves 2014
Corporate Presentation 2010
Other 1993
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