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United States
Ottawa Mine

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 Location:
120 km SW from Chicago, Illinois, United States

  Regional Office:
701 Boyce Memorial Drive
Ottawa
Illinois, United States
61350
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WebsiteWeb
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  • Overview
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  • Reserves
  • Financials
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Silica
Mining Method
  • Truck & Shovel / Loader
  • Hydraulic mining
Production Start...
U.S. Silica's Ottawa plant is North America's largest silica production facility, mining fine grain, nearly pure quartz sandstone.


Owners

Source:
CompanyInterestOwnership
USS Holdings, Inc. 100 % Indirect
U. S. Silica Company (operator) 100 % Direct

Contractors

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Deposit Type

  • Sandstone hosted


Summary:

The reserves are part of the St. Peter Sandstone Formation that stretches north-south from Minnesota to Missouri and east-west from Illinois to Nebraska and South Dakota.

The deposit has a minimum silica (SiO2) content of 99%. The controlling attributes are grain crush strength, iron (Fe2O3) content and grain size distribution. Iron is concentrated near the surface, where orange iron staining is evident and also increases where the bottom contact becomes concentrated in iron pyrite. Maximum average full-face iron content is 0.045%. The deposit tends to exhibit a coarser grain size distribution in the top half of deposit


Mining Methods

  • Truck & Shovel / Loader
  • Hydraulic mining


Summary:

At the Ottawa property, the St. Peter Sandstone is mined by conventional surface mining methods. Blasted St. Peter Sandstone is mined mechanically and then hauled to a location in the pit where it is further processed by hydraulic methods and mixed with water to produce a slurry product that is pumped to the processing plant.


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnits20212020201920182017
Silica k tons  ......  Subscription required  ......  Subscription required  ......  Subscription required4,0934,367
Subscription required - Subscription is required.

Operational Metrics:

Metrics2021
Annual mining capacity  ......  Subscription required
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Reserves at December 31, 2021:

CategoryTonnage Commodity
Proven 66,926,671 k tons Silica
Probable 33,002,024 k tons Silica
Proven & Probable 99,928,695 k tons Silica

Financials:

Units20212020
Book Value M USD  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 24, 2022
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Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2017
Other 2014
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