Overview
| Stage | Production |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
|
| Processing |
- Flotation
- Dense medium separation
|
East Tennessee consists of a processing plant and three underground zinc mines ; Young, Coy and Immel. Ore from the three mines is processed into zinc concentrate at the Young mine site. |
| Company | Interest | Ownership |
|
Nyrstar
|
100 %
|
Direct
|
Summary:
East Tennessee Mines are comprised of three operating mines: Coy, Immel and Young, located approximately 30 kilometres north-east of Knoxville, Tennessee. Zinc mineralisation occurs in Mississippi Valley Type (‘MVT’) deposits as open-space fillings of breccias and fractures within limestones and dolomites.
Processing Technologies
- Flotation
- Dense medium separation
Summary:
Ore from the three mines is processed into zinc concentrate at the Young mine site. The East Tennessee zinc mine complex has a close association with Nyrstar’s Clarksville smelter.
Recoveries & Grades:
| Commodity | Parameter | 2017 | 2016 | 2015 | 2014 | 2013 |
|
Zinc
|
Recovery Rate, %
| 95.1 | 94.3 | 91 | 92 | 94.8 |
|
Zinc
|
Head Grade, %
| ......  | ...... | ...... | ...... | ...... |
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Production:
| Commodity | Product | Units | 2017 | 2016 | 2015 | 2014 | 2013 |
|
Zinc
|
Metal in concentrate
|
kt
| ...... | ...... | 64 | 63 | 71 |
|
Zinc
|
Concentrate
|
kt
| ...... | ...... | 104 | 101 | 113 |
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Operational Metrics:
| Metrics | 2017 | 2016 | 2015 | 2014 | 2013 |
|
Tonnes milled
| ...... | 1,829 kt of ore | 1,985 kt of ore | 1,955 kt of ore | 2,019 kt of ore |
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Reserves at December 31, 2017:
| Category | Tonnage | Commodity | Grade |
|
Proven
|
0.26 Mt
|
Zinc
|
2.8 %
|
|
Probable
|
2.45 Mt
|
Zinc
|
3.7 %
|
|
Proven & Probable
|
2.7 Mt
|
Zinc
|
3.6 %
|
|
Measured
|
0.27 Mt
|
Zinc
|
2.9 %
|
|
Indicated
|
5.19 Mt
|
Zinc
|
4.2 %
|
|
Measured & Indicated
|
5.45 Mt
|
Zinc
|
4.1 %
|
|
Inferred
|
27.18 Mt
|
Zinc
|
3.8 %
|
Operating Costs:
| | Units | 2017 | 2016 | 2015 |
|
Direct operating costs ($/t milled)
|
USD
| 40 | 38 | 42 |