About American Zinc Smelter Company Desloge Missouri

Desloge sits in the heart of the Old Lead Belt — a corridor of St. Francois County that produced more lead ore per square mile than virtually anywhere else on Earth during the nineteenth and twentieth centuries. The American Zinc Smelter was one of the central employers in that industrial landscape for much of that era. Lead and zinc smelting in the Desloge area dates to the late 1800s, when enterprises like the St. Joe Lead Company began refining raw galena ore into finished metal products. The American Zinc Smelter processed sulfide ores through roasting, sintering, and reduction furnaces that ran at extreme temperatures around the clock.

Workers employed at the American Zinc Smelter between 1940 and 1980 faced the greatest asbestos exposure risk. The facility employed hundreds of workers across multiple craft trades during those decades, making it one of the largest industrial employers in St. Francois County.

Lead and zinc smelting drives ore to temperatures exceeding 1,100 degrees Celsius in some processes. Roasting and sintering sulfide concentrates, reducing metal oxides in blast furnaces or retorts, refining crude metal — all of it generates sustained, punishing heat. Before federal regulators began curtailing asbestos use in the mid-1970s, asbestos was the industry-standard solution for managing that heat. Manufacturers promoted it aggressively, and industrial purchasers bought it by the ton.

Asbestos was built into nearly every thermal and mechanical system at a smelter of this type:

High-Temperature Equipment:

  • Furnace and kiln insulation — walls, roofs, and surrounds using asbestos block, asbestos cement, and refractory materials
  • Steam lines, process water lines, and condensate return systems wrapped in asbestos pipe covering
  • Boilers and boiler systems — insulation, gaskets, rope packing
  • Electrical panels, switchgear, and high-temperature wiring — asbestos cloth, tape, and board

Mechanical Applications:

  • Pumps, valves, and mechanical seals — asbestos gaskets and compression packing

General Equipment at American Zinc Smelter Company Desloge Missouri

The equipment below represents the systems and infrastructure documented or typically present at this facility during the era when asbestos-containing materials were specified in industrial construction. This is general facility-equipment reference — not a legal attribution of any specific product, manufacturer, or exposure event to this facility. Material-category and manufacturer information is addressed in the AsbestosIndex Product Crosswalk linked under the records table below.

Industrial Boilers View crosswalk › Process Piping View crosswalk › Pipe Insulation View crosswalk › Block Insulation View crosswalk › Valves View crosswalk › Gaskets View crosswalk › Pumps View crosswalk › Heat Exchangers View crosswalk › Cooling Equipment View crosswalk ›

Documented Asbestos Evidence

The records below are verified, state-documented asbestos removals at this facility. Each entry represents a regulated abatement project where the Missouri Department of Natural Resources (Missouri DNR) was notified under federal NESHAP rules, the work was logged, and the asbestos-containing material was confirmed and removed under regulated conditions. These are not allegations or estimates — they are paper records tying documented asbestos-containing material to this specific site.

No Missouri DNR NESHAP abatement notifications have been identified for this facility in current public records. Per the framing above, absence of state-agency documentation should not be read as absence of asbestos — only as absence of a formal, regulated abatement event meeting reporting thresholds. Workers who recall encountering pipe insulation, block insulation, gaskets, or other asbestos-era construction materials at this facility may still have viable claims regardless of whether a state record exists.

Material Categories in Documented Records

The materials documented above (and similar asbestos-containing materials commonly encountered in records of this type) appear in the AsbestosIndex catalog with historical manufacturer and trust-fund information. Click a category to view manufacturers historically associated with that material:

Thermal System Insulation View crosswalk › Asbestos-Cement Board View crosswalk › Pipe Insulation View crosswalk › Roofing & Flashing View crosswalk › Spray Fireproofing View crosswalk › Floor Tile & Mastic View crosswalk › Ceiling Tile View crosswalk › Gaskets & Packing View crosswalk ›

Who May Have Been Exposed at American Zinc Smelter Company Desloge Missouri

Asbestos exposure at the American Zinc Smelter cut across trade lines. Because asbestos was built into nearly every thermal and mechanical system on the property, no single craft owned the risk — but certain trades faced the most intense and most frequent contact with asbestos-containing materials.

Insulators — Heat and Frost Insulators Local 1, St. Louis carried the heaviest burden. Their work put them in direct, sustained contact with asbestos every shift: mixed asbestos insulating cement by hand, routinely without respiratory protection; cut calcium silicate insulation and Armstrong pipe covering with handsaws, generating clouds of respirable dust; applied asbestos block insulation to furnace walls and equipment surfaces; stripped damaged pipe covering and insulation and calcium silicate pipe covering during maintenance outages, releasing concentrated fiber clouds in enclosed spaces; applied finishing coats of asbestos cement over completed insulation systems; and installed asbestos blankets and cloth around irregularly shaped equipment. The insulator trade has produced mesothelioma rates many times higher than those in the general population.

Pipefitters and Steamfitters — UA Local 562, St. Louis encountered asbestos from multiple directions simultaneously: worked alongside insulators as calcium silicate insulation, Armstrong, and pipe covering and insulation insulation was installed and removed — breathing fiber-laden air in enclosed equipment areas; cut and fitted gaskets and packing asbestos rope gasket material for flanged connections; scraped old asbestos gaskets from pump and valve bodies with wire brushes and chisels; handled pipe covering sections when rerouting or modifying piping systems; and removed asbestos packing from pump stuffing boxes and valve bonnets. Pipefitters regularly worked in confined spaces — pipe trenches, equipment enclosures, beneath platform grating — where fibers from pipe covering and insulation pipe covering, products, and insulating cement accumulated to concentrations far above open-air levels.

Boilermakers — Boilermakers Local 27, St. Louis engaged in industrial boiler maintenance requiring continuous asbestos work: removed and replaced asbestos lagging from boiler exteriors during inspection and repair outages; worked inside boilers for tube inspection and repair, disturbing residual fiber contamination; cleaned and prepared boiler exteriors before new insulation was applied; and removed asbestos rope packing and gaskets and packing from boiler connections and fittings.

Electricians working in high-temperature zones cut and fitted pipe covering and insulation asbestos cloth and tape for electrical panel insulation; installed asbestos board barriers in or near electrical equipment in high-temperature areas; handled pre-manufactured asbestos-insulated cables and flexible conduit; and worked alongside insulators applying and other asbestos insulation in areas immediately adjacent to electrical equipment.

Plant Maintenance Workers and Laborers faced less task-specific but still significant exposure: swept and cleaned debris from equipment and platforms — calcium silicate insulation dust, Armstrong fragments, refractory material; transported and staged asbestos-containing materials across the facility; worked in areas where insulators, pipefitters, and boilermakers were actively applying or removing asbestos products; and performed routine equipment operations that disturbed deteriorated asbestos insulation on furnaces and piping.

Critical Filing Deadline & Next Steps

Missouri law gives mesothelioma and asbestos-disease claimants 5 years from the date of medical diagnosis to file a personal-injury lawsuit (Mo. Rev. Stat. § 516.120). For wrongful-death claims after an asbestos-related death, the filing window is 3 years from the date of death (Mo. Rev. Stat. § 537.100). The two deadlines run on separate tracks — preserving one does not extend the other.

The personal-injury clock runs from diagnosis, not from exposure. Mesothelioma latency is typically 20 to 50 years, so workers exposed in the 1950s–1980s are being diagnosed today.

Practical first steps

  1. Document what you remember. Pay stubs, W-2s, union cards, photographs, coworker names, and dates of employment. The WorkChain widget on this page can save a copy you can email yourself.
  2. Preserve medical records. Pathology reports, biopsy results, imaging, and pulmonary-function tests are central to both civil claims and trust-fund filings.
  3. Identify household members. Spouses who laundered work clothing and children of plant workers are eligible for secondary-exposure claims when diagnosed with an asbestos-related disease.
  4. Speak with an asbestos attorney with Missouri experience. The first conversation is free and confidential. Asbestos trust-fund claims and civil claims run on different tracks — both can be pursued in parallel.

Asbestos-Related Diseases

Asbestos fiber exposure can cause several specific diseases that typically appear decades after the original exposure. The latency period — the gap between exposure and diagnosis — usually runs 20 to 50 years. That's why workers exposed in the 1960s, 1970s, and 1980s are receiving diagnoses today.

Mesothelioma

A rare, aggressive cancer that affects the lining of the lungs (pleural mesothelioma), abdomen (peritoneal), or heart (pericardial). Mesothelioma is almost exclusively caused by asbestos exposure, which is why a mesothelioma diagnosis often points directly to historical workplace exposure. Average latency from first exposure to diagnosis is 30-50 years.

Asbestosis

A chronic, non-cancerous scarring of lung tissue caused by inhaled asbestos fibers. Asbestosis causes progressive shortness of breath, persistent cough, and reduced lung function. It does not improve with treatment, and it is a recognized basis for compensation under most trust schedules and civil claims.

Lung Cancer

Asbestos exposure significantly increases the risk of lung cancer, particularly when combined with a history of smoking. Asbestos-related lung cancer is compensable under the same trust schedules and civil claim avenues as mesothelioma.

Other Recognized Diseases

Pleural plaques, pleural thickening, laryngeal cancer, ovarian cancer, and certain gastrointestinal cancers are also recognized as asbestos-related under various trust schedules and case-law authorities, though eligibility and proof requirements vary by claim type.

If you have any of these diagnoses and you worked at this facility, lived with someone who did, or were exposed in any documented capacity, you may have a claim worth pursuing. Speak with an attorney before assuming you don't qualify.

Data Sources

Information about facility equipment, industrial materials, and occupational records referenced on this page is drawn from publicly available sources where applicable, including:

If specific equipment or product claims in this article are sourced from a non-public database, the source is identified parenthetically within the text above.