• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
United States
San Miguel Mine

This page is not tailored to
devices with screen width under 750 px.
 Location:
75 km S from San Antonio, Texas, United States

  Regional Office:
3831 Technology Forest Blvd
The Woodlands
Texas, United States
77381
Phone  ...  Subscription required
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in United States
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Production
  • Fleet
  • Personnel
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Coal (thermal)
  • Lignite
Mining Method
  • Dragline
Production Start...


Owners

Source:
CompanyInterestOwnership
San Miguel Electric Cooperative, Inc. 100 % Direct
San Miguel Electric Cooperative, Inc. is the owner of the mine.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Sedimentary


Summary:

The mine extracts lignite coal from the Jackson formation, seams A, B, C and D ranging in thickness from 1.0 to 4.5 feet with a combined average total lignite thickness of approximately 9 feet. The seams are separated by relatively thin partings which vary in thickness from 0.5 to 1.5 feet.

The deposit consists of four or more thin (generally < 1 m or 3.3 ft thick) lignite benches that are separated by claystone and mudstone partings (fig. 2). The partings are composed of altered volcanic air-fall ash that has been reworked by tidal or channel processes associated with a back-barrier depositional environment (Snedden and Kersey, 1981; Gowan, 1985; Ayers, 1986; Senkayi and others, 1987; and Warwick and others, 1996).

In the mine area, the Jackson strata dip to the southeast about 17 m/km (90 ft/mi) (Ayers, 1986). Gowan (1985) and Ayers (1986) suggest that the mud-dominated sediments the comprise the floor, partings, and roof of the San Miguel lignite deposit originated in lagoonal mires landward (west) of the sandstone-dominated barrier island complex. The lignite-bearing interval is laterally persistent along strike for more than 40 kilometers (25 mi) (Ayers, 1986, 1989; Tewalt and others 1983).

The San Miguel lignite interval consists of four (or more) thin (generally <1 m or 3.3 ft thick) lignite benches that are separated by claystone and mudstone partings. The upper bed is designated as the A bed and is underlain by the B, C, and D beds ........


Mining Methods

  • Dragline


Summary:

The overburden removal is achieved using two draglines, a 76-cubic-yard machine and a 30-cubic yard dragline. The 76-cubic-yard dragline moves nearly 21 million yards per year of overburden, while the 30-cubic-yard dragline moves about 7.7 million yards per year. Assisting the overburden operation is a 19-cubic-yard mass excavator with a fleet of 100 ton end dump trucks. The lignite is mined using a specialized mining tool called an Easy Miner. These machines resemble milling machines used to remove and recover asphalt and concrete highway surfaces and provides tight depth control to selectively mine the lignite or remove the parting, as well.


Crushing and Grinding


Processing



Production:

CommodityUnits202120202019201820172016
Lignite tons  ......  Subscription required  ......  Subscription required  ......  Subscription required2,977,0993,070,7082,776,858
Subscription required - Subscription is required.


Reserves at :




Heavy Mobile Equipment:
HME TypeModelQuantityRef. Date
Dragline ....................... Subscription required ....................... Subscription required Apr 1, 2015
Dragline ....................... Subscription required ....................... Subscription required Apr 1, 2015
Excavator ....................... Subscription required ....................... Subscription required May 1, 2015
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 27, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015
Subscription required 2014
Subscription required 2013
Subscription required 2012

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Other 2018
Other 2017
Other 2016
Other 1999
Subscription required - Subscription is required.

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2017-2023 MDO Data Online Inc.