Overview
Stage | Production |
Mine Type | Underground |
Commodities |
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Mining Method |
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Production Start | ... |
SEMO mining operation consists of Casteel, Buick, Brushy Creek, Fletcher, Sweetwater and No. 29 Mines. |
Source:
Contractors
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Summary:
Missouri has three world-class lead/zinc subdistricts (Old Lead Belt, Mine La Motte-Fredericktown, and Viburnum Trend) and several minor subdistricts that are in a region referred to as the Southeast Missouri Lead District. Arsenic, cadmium, cobalt, copper, lead, nickel, and zinc are the primary trace elements associated with the sulfide minerals of the Mississippi Valley Type ore deposits present in the district.
The MVT deposits of the Southeast Missouri Lead District are metal-sulfide deposits that are hosted in Paleozoic dolostone, limestone, and to a lesser extent sandstone. The primary metal-sulfide minerals of these deposits are pyrite–marcasite (FeS2), galena (PbS), and sphalerite (ZnS). In localized areas, mixed-metal sulfide minerals also occur in minor amounts. These include copper sulfide minerals such as bornite (Cu5FeS4), chalcopyrite (CuFeS2), and enargite (Cu3AsS4); nickel sulfide minerals such as millerite (NiS) and vaesite (NiS2); and iron sulfide minerals such as arsenopyrite (FeAsS) (Rakovan, 2007).
Summary:
SEMO’s mining operations take place up to 1,250 feet underground. The mines have extracted nearly 310 million tons of lead-bearing ore from the Viburnum Trend since production began in 1960.
Doe Run’s mines are large underground structuresthat extend for miles. Four of the company’s mines – Buick, Brushy Creek, Casteel and Fletcher – are interconnected by 25 miles of roadway.
Millions of dollars worth of equipment operates underground, including hydraulic drills, trucks, loaders, charging rigs and scalers – all of which are disassembled to transport down the shaft and reassembled underground.
SEMO uses the room-and-pillar mining method, in which rock pillars (up to 35 feet wide and 120 feet tall) support the ground above.
SEMO also utilizes “remote mining,” which involves remote operation of a 25-ton loader so blasted ore can be safely excavated from hundreds of feet away. This method is used to remove select pillars left behind after a mine’s reserves are extracted.
Ventilation in our underground mines is always of utmost importance. In 2019, we completed the addition of another vent shaft in the southern area of our mines. This shaft, the Big Bear Vent Shaft, supports more efficient development in the area.
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Summary:
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Production:
Commodity | Units | 2016 * | 2015 * |
Lead
|
kt
| 227 * | 227 |
All production numbers are expressed as concentrate.
* Average annual production reported in 2015
Operational Metrics:
Metrics | 2020 |
Annual ore mining rate
| ...... |
Financials:
| Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
Capital expenditures
|
M USD
| ...... | ...... | ...... |
......
|
46.9
|
21.4
|
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Corporate Filings & Presentations:
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