Mining Intelligence and News
United States

SEMO Operation

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Categories

Summary

Mine TypeUnderground
StatusActive
Commodities
  • Lead
  • Copper
  • Zinc
Mining Method
  • Room-and-pillar
Production Start... Lock
SnapshotSoutheast Missouri Mining and Milling Division (SEMO) manages several underground mines, including Casteel, Buick, Brushy Creek, Fletcher, Sweetwater, and Mine No. 29. These mines primarily extract lead, along with zinc and copper minerals.

Owners

SourceSource
CompanyInterestOwnership
The Doe Run Resources Corp. 100 % Indirect
The Doe Run Company, through its Southeast Missouri Mining and Milling Division (SEMO), operates several mines in the Viburnum Trend of southeast Missouri, including the Casteel, Buick, Brushy Creek, Fletcher, Sweetwater, and Mine No. 29. These operations are wholly owned and managed by The Doe Run Company.

Deposit type

  • Mississippi Valley Type

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).

Mining Methods

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Heavy Mobile Equipment

Fleet data has not been reported.

Comminution

Crushers and Mills

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Processing

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Commodity Production

CommodityUnits20162015
Lead kt 227 *227 *
All production numbers are expressed as concentrate. * Production numbers were reported as 'Average annual'

Operational metrics

Metrics2020
Annual ore mining rate  ....  Subscribe

Production Costs

Commodity production costs have not been reported.

Mine Financials

Units2023202220212020201920182017
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 34.1   46.9   21.4  

Personnel

Mine Management

Job TitleNameProfileRef. Date
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Workforce

EmployeesYear
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Aerial view:

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