Overview
| Stage | Production |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
|
| Processing |
- Flotation
- Dense medium separation
|
During 2016, there was no production due to the operations being placed on care and maintenance during December 2015.
Middle Tennessee mines were re-started in May 2017. |
| Company | Interest | Ownership |
|
Nyrstar
|
100 %
|
Direct
|
Summary:
Middle Tennessee Mines is comprised of three operating mines: Gordonsville, Elmwood, and Cumberland and one project, Stonewall, which are located approximately 80 kilometres east of Nashville, Tennessee. Zinc mineralisation occurs in Mississippi Valley Type (‘MVT’) deposits as open-space fillings of breccias and fractures within limestones and dolomites. In MTM, the zinc mineralisation contains recoverable amounts of germanium and gallium.
Processing Technologies
- Flotation
- Dense medium separation
Summary:
The Middle Tennessee zinc mine complex has a history of close association with Nyrstar’s Clarksville smelter, which was originally constructed to treat zinc concentrate from the mines. Ore mined at the three mines is processed into zinc concentrate at the Gordonsville zinc mine complex.
Along with zinc concentrate, Middle Tennessee delivers recoverable amounts of germanium and gallium as by-products to the Clarksville smelter.
Recoveries & Grades:
| Commodity | Parameter | 2017 | 2015 | 2014 | 2013 |
|
Zinc
|
Recovery Rate, %
| 92.8 | 98.1 | 95.5 | 93.8 |
|
Zinc
|
Head Grade, %
| ......  | ...... | ...... | ...... |
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Production:
| Commodity | Product | Units | 2017 | 2015 | 2014 | 2013 |
|
Zinc
|
Metal in concentrate
|
kt
| ...... | 47 | 47 | 50 |
|
Zinc
|
Concentrate
|
kt
| ...... | 74 | 74 | 79 |
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Operational Metrics:
| Metrics | 2017 | 2015 | 2014 | 2013 |
|
Tonnes milled
| ...... | 1,482 kt of ore | 1,555 kt of ore | 1,648 kt of ore |
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Reserves at December 31, 2017:
| Category | Tonnage | Commodity | Grade |
|
Proven
|
0.28 Mt
|
Zinc
|
3.3 %
|
|
Probable
|
3.18 Mt
|
Zinc
|
3.3 %
|
|
Proven & Probable
|
3.46 Mt
|
Zinc
|
3.3 %
|
|
Measured
|
0.28 Mt
|
Zinc
|
3.7 %
|
|
Indicated
|
3.86 Mt
|
Zinc
|
3.5 %
|
|
Measured & Indicated
|
4.14 Mt
|
Zinc
|
3.5 %
|
|
Inferred
|
16.35 Mt
|
Zinc
|
3.5 %
|
Operating Costs:
| | Units | 2017 |
|
Direct operating costs ($/t milled)
|
USD
| 60 |
Mine Management:
| Job Title | Name | Profile | Ref. Date |
.......................
|
.......................
|
|
Apr 16, 2018
|
- 'Supplier or 'Investor' subscription is required.
Staff:
| Employees | Year |
|
|
2017
|
Corporate Filings & Presentations:
- Subscription is required.